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Topic: Low-frequency oscillator

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LMX2326 - 2.8 GHz PLLatinum Low Power Frequency Synthesizer for RF Personal Communications The LMX2306/16/26 are monolithic, integrated frequency synthesizers with prescalers that are designed to be used to generate a very stable low noise signal for controlling the local oscillator of an RF transceiver. When combined with a high quality reference oscillator and loop filter, the LMX2306/16/26 provide the feedback tuning voltage for a voltage controlled oscillator to generate a low phase noise local oscillator signal. The LMX2306/16/26 feature ultra low current consumption; LMX2306 - 1.7 mA at 3V, LMX2316 - 2.5 mA at 3V, and LMX2326 - 4.7 mA at 3V. www.national.com /pf/LM/LMX2326.html   (318 words)

AWA_BFO.html The Beat Frequency Oscillator (BFO) is an audio oscillator made by A.W.A. (Amalgamated Wireless Australia) in 1943. The two oscillators are mixed in another 6J8G, and then filtered through a 2 stage Low Pass Filter, to remove any 100 kcs frequencies. It is easy to use, has a single frequency control, can be adjusted for low level amplifier inputs, or can even drive a speaker. www.shlrc.mq.edu.au /~robinson/museum/AWA_BFO.html   (318 words)

10 GHz SUPER-REGENERATIVE RECEIVER A super-regenerative detector is based on the repeated build-up and decay of oscillation in an oscillator, which is caused to operate intermittently by means of a quenching signal supplied from a separate low frequency oscillator, or from a low-frequency relaxation of the oscillator itself. Indeed to sufficiently lower the frequency needs a great thickness of low permittivity ceramic adding; on the contrary if the permittivity is high, the thickness will be lower but the ceramic temperature coefficient is very high usually. An audio amplifier is all that is required after the SR with a low-pass filter in order to remove the quenching frequency, which could disturb the amplifier even into inaudibility. www.vhfcomm.co.uk /f9hx_1.htm   (318 words)

Ultra-low Noise Oscillators Test Data The noise floor of the measurement system was determined by driving both frequency doublers with the same oscillator at approximately the average power level used in the phase noise measurements, This required the use of an external low noise amplifier to compensate for the losses in the power splitter. The phase noise of these oscillators is extremely low, which makes it difficult to eliminate the biases in the measurements due to the noise floor of the measurement system and the contribution of the reference oscillator. The phase noise measurements were made over a wide range of Fourier frequencies to be able to fit the phase noise to a model, and to check that the phase noise varied in a reasonable way with Fourier frequency. www.wenzel.com /documents/ulntests.html   (318 words)

National P/N LMX2313U - 600 MHz PLLatinum Ultra Low Power Frequency Synthesizer for RF Personal Communications The device, when combined with a high quality reference oscillator and a voltage controlled oscillator, generates very stable, low noise local oscillator signals for up and down conversion in wireless communication devices. LMX2310U LMX2311U LMX2312U LMX2313U PLLatinum™ Ultra Low Power Frequency Synthesizer for RF Personal Communications LMX2310U 2.5 GHz LMX2311U 2.0 GHz LMX2312U 1.2 GHz LMX2313U 600 MHz National P/N LMX2313U - 600 MHz PLLatinum Ultra Low Power Frequency Synthesizer for RF Personal Communications www1.national.com /pf/LM/LMX2313U.html   (318 words)

Low Noise Frequency Synthesizers The frequency source includes an ultra-low noise 5 MHz oscillator phase-locked to an external reference and distributed within the instrument by an active frequency distribution amplifier. Direct frequency multiplication is used to generate intermediate frequencies of 10 and 30 MHz from an ultra-low noise 5 MHz oscillator with the following results: Wenzel Associates is now manufacturing frequency synthesizers with exceptionally low harmonic and spurious content and state-of-the-art phase noise performance at fixed frequencies from 1 MHz to 1.2 GHz. www.wenzel.com /documents/lowsyn.htm   (318 words)

Time and Frequency from A to Z Usually, headphones are used to listen for zero beat, since the receiver�s speaker might not be able to produce the low frequency beat note signals. Rubidium oscillators are the lowest priced and most common atomic oscillators, but cesium beam and hydrogen maser atomic oscillators are also sold commercially. For example, an amateur radio operator might calibrate a receiver dial by mixing the incoming signal from WWV with the signal from the receiver�s beat frequency oscillator (BFO). www.boulder.nist.gov /timefreq/general/enc-am.htm   (318 words)

Mitsubishi - MF SMD Oscillator - Super Low Jitter 125 MHz Reference For Gigabit Datacom Model T3492 provides super low jitter,plus further subtle benefits that stem from the crystal 's oscillation at its fundamental resonant frequency. Low voltage oscillators also extend battery life of portable/mobile equipment. Low voltage power supplies produce less heat, in turn simplify cooling needs, costs and complexities. www.mig.de /iss/press/osc_news9.htm   (318 words)

Class 331: OSCILLATORS / U.S. Patent Classification Definitions In general, beat frequency oscillators classified herein comprise means for beating two nonarbitrary sources of slightly different frequencies and of substantially equal amplitudes, the proximate purpose of the system being to produce a stable, high level, low frequency output wave (by selecting the lower side band). Subject matter wherein the oscillator circuit is provided with means for performing at least one other function in addition to the generation of oscillations, which other function is independent of and is intended to be performed concurrently with the production of oscillations by the oscillator. If only one oscillator is significantly claimed and the other oscillator or oscillators are merely recited by name only without any oscillator circuit detail being claimed, classification is elsewhere in this class in accordance with the nature of system or of the significant oscillator claimed. www.uspto.gov /web/offices/ac/ido/oeip/taf/def/331.htm   (318 words)

Communication The opening of higher frequencies (those of the microwave region) to radar, with its attendant advantages, came about in late 1939 when the cavity magnetron oscillator was invented by British physicists at the University of Birmingham. Both of these radars were available at the start of World War II, as was the navy's CXAM shipboard surveillance radar (at a frequency of 200 MHz). The principle of radar was “rediscovered” at the NRL in 1930 when L.A. Hyland observed that an aircraft flying through the beam of a transmitting antenna caused a fluctuation in the received signal. www.puhsd.k12.ca.us /chana/staffpages/eichman/Adult_School/us/spring/world_war_ii/communication.htm   (1148 words)

A low cost frequency modulated oscillator The phase of the modulation is then compared with a direct signal by determining the maximum beat frequency on a rate-meter. It is normally used as a radio altimeter in which a frequency modulated 440 MHz signal is transmitted from the aircraft and received after reflection from the ground. The APN-1 unit is a low cost piece of equipment available from many of the dealers handling surplus electronic devices. stacks.iop.org /0031-9120/9/28   (1148 words)

WH-DRAO -- ECassio-VE98 Leonid is developing a local oscillator system for the Large Adaptive Reflector, and Anne is measuring the figure of the antennas of the DRAO Synthesis Telescope using holographic techniques. Observations of the entire survey area with the DRAO 26-m Telescope (to provide short-baseline information for the survey) are now complete, and Lloyd Higgs is working on the final corrections to these data (for telescope sidelobe responses and other small effects). Christmas was an especially happy season for DRAO, with the news that the senior management of NRC has decided that our Observatory is not to be closed in March 2001, but is to continue (for the announcement, see the December 1997 issue of Cassiopeia). www.astro.ubc.ca /E-Cass/1998-ME/WH-DRAO.html   (1148 words)

frequency oscillator ultralow Sell frequency oscillator ultralow Nokia 9500 [UK] The nokia 9500 is brand new phones, SIM free, never locked, no logo or stickers, new battery, all.. the lower the corner frequency of the loop filter for the... PNP SILICON 300 VOLTS 20 WATTS 351 (3136) HIGH FREQUENCY LOW NOISE AMPLIFIER NPN SILICON EPITAXIAL... frequencyoscillatorultralow.flogoscillator.com   (553 words)

Misc. Oscillator Types Oscillators may also be disciplined with transmitted timing signals including Loran-C, GPS, WWVB, Omega, cellular, CDMA and similar systems providing precision time and frequency information either as a primary or secondary function. The synthesizer may be a crude "pulse swallower" or a modern numerically-controlled oscillator (also called DDS - direct digital synthesis) depending upon the phase noise and resolution requirements. A VHF crystal may be phase-locked to a low frequency crystal to achieve low VHF phase noise with the close-in noise and low aging of the low frequency crystal. www.wenzel.com /documents/other.html   (436 words)

[No title] Frequency standard, primary&secondary distribution units have been designed for the low-noise distribution of reference signals where reliability is a paramount importance. Frequency standard, rubidium, portable, very low temperature sensitivity, excellent short term stability, fast warm-up, small volume, low profile, Rb lamp extended life expectancy (20 years), RS 232 interface for center frequency adjustment and monitoring of the working parameters, precision manual frequency adjust, lock/unlock indicators. Frequency standard, rubidium, ultra low phase noise, time-tags or phase-l°Cks to a 1 pps input, RS232 for diagnostics, control and calibration, long lamp life and established reliability, low cost. www.radiocomp.ru /components1.asp?n=113   (2702 words)

World Intellectual Property Organization A digital Nyquist filter 14, a low-pass filter 16, an allpass 18, a sign detector 20 and a gain control circuit 22 as well as a video output 20a, an audio output 20b, a tuner control output 22b and an intermediate frequency amplifier control output 22a are also arranged in the demodulator 2. By coupling the gain control circuit 22 to the low-pass filter 32, the bandwidth of the loop filter in 12b may be controlled as a function of the signal level of the intermediate frequency signal. A digital phase locked loop as claimed in claim 6, characterized in that the magnitude of the lower limit value is between 0 and 10% of the maximum amplitude of the carrier signal strength. www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/67751.030814&ELEMENT_SET=DECL   (2702 words)

Product Folder : SN74LS624 - Voltage-controlled oscillator When the enable input is low, the output is enabled: when the enable input is high, the internal oscillator is disabled, Y is high, and Z is low. The output frequency for each VCO is established by a single external component (either a capacitor or crystal) in combination with voltage-sensitive inputs used for frequency control and frequency range. These voltage-controlled oscillators (VCOs) are improved versions of the original VCO family: SN54LS124, SN54LS324 thru SN54LS327, SN74LS124, and SN74LS324 thru SN74LS327. focus.ti.com /docs/prod/folders/print/sn74ls624.html   (836 words)

Star City Antique Radios - Hewlett-Packard Calibration This specialized member of the HP 200 series of oscillators provides the low-frequency signals for calibration. The meter and output attenuator provide accurate output voltages, and are also used with the 200SR oscillator for low frequencies. The three instruments are (from top to bottom) the 200SR Oscillator, the 739AR Frequency Response Test Set, and the 738AR Voltmeter Calibrator. members.cox.net /dalehcook/radios/pages/hp-cal.shtml   (836 words)

rubidium oscillator Rubidium controlled time and frequency systems requiring low phase noise;low profile rubidium oscillator designed to plug directly into a single circuit board;low profile rubidium oscillator... My project uses the signals broadcast by these GPS satellites to control (discipline) the frequency of a local quartz or rubidium oscillator and to thereby obtain superb accuracy at a very modest... The FS725 integrates a rubidium oscillator (SRS model PRS10), a low-noise AC power supply, and distribution amplifiers in a compact, half-width 2U chassis. rubidiumoscillator.flogoscillator.com   (911 words)

Patent 4713556 Such a frequency converter circuit comprises a collector-grounded transistor oscillator and a mixer including two diodes, in which an oscillation frequency is applied from an inductor of a resonance circuit of the oscillator by inductive coupling to the mixer circuit. A frequency converter circuit according to claim 1, wherein a low-pass filter is coupled to the collector of said second transistor so that said intermediate frequency signal is output from said mixer circuit through said low-pass filter. The present invention relates generally to a frequency converter circuit comprising a high-frequency oscillator, a buffer amplifier and a mixer for converting a high-frequency signal into an intermediate-frequency signal. www.freepatentsonline.com /4713556.html   (911 words)

EXPLORING ANALOGUE Each oscillator typically has a range control for setting the basic oscillator frequency (32', 16', 8' etc.), of which 'Low' is one of the options. Putting low frequency control to one side for the moment, the use of audio oscillators for control purposes means that you can modulate another device while the modulating oscillator is operating in the audio frequency range. Oscillator sync was introduced so that you could mix several oscillators without this problem. www.sospubs.co.uk /sos/1994_articles/jun94/analogue.html   (911 words)

Input stage for a police radar detector (US5856801) The local oscillator is coupled to the far end of the mixer through a second bandpass filter and the far end of the mixer is coupled to the intermediate frequency amplifier through a low pass filter. The low frequency signals, X band police radar signals, are coupled to the far end of the mixer through a band rejection filter, which serves as a diplexer, a preamplifier and a first bandpass filter. An input stage of a police radar detector is configured so that a near end of a mixer is coupled to an antenna for receiving high frequency signals and a far end of the mixer is coupled to the antenna for receiving low frequency signals. www.delphion.com /details?pn=US05856801__   (484 words)

rs80 low freq oscillator Synthesisers have a class of oscillators - Low Frequency Oscillators (LFOs) - that create these, and many other, effects. They can add vibrato to a sound, produce growl, act as low frequency clocks and, on some synthesisers, double as audio frequency oscillators. The RS80 can, therefore, be used in three ways: as a low frequency modulator; as an audio frequency modulator; and as a secondary sound source. www.analogue.org /network/rs80.htm   (484 words)

Symmetricom rubidium frequency standard update The 8040C rubidium frequency standard with the low phase noise option is available immediately for purchase. According to Symmetricom, this option addresses the requirements of satellite ground station applications where frequency stability and low noise are critical parameters to track and communicate to satellites. Symmetricom, Inc. has unveiled a product update to its rubidium frequency standard, adding a new low phase noise option that provides a greater than 30 dB improvement in phase noise. rfdesign.com /products/rubidium-frequency-standard/index.html   (216 words)

VFO Page I evaluate all my oscillators this way as variations in frequency are easily detected by variations in pitch by the ultra-sensitive human ear. One thing which may be trouble some for some builders is that the VFO tank was designed for a variable capacitor with a relatively low frequency swing (9 to 24 pF). The Clapp circuit allows a greater amount of inductance to be used than would be possible in a parallel-tuned oscillator. www.qrp.pops.net /VFO.htm   (1747 words)

Q Multiplication in the Wien-bridge Oscillator For the case of the modified Wien-bridge oscillator using a single variable resistor for frequency control: This configuration is capable of delivering a clean output sine wave using a low-Q frequency-determining R-C network and some negative feedback. Also, the oscillator should be adequately shielded from external noise sources, such as fluorescent lamps, computers, switch-mode power supplies, etc. www.schmarder.com /radios/tech/Q-Multi.htm   (1747 words)

Introduction to Thermionic Valves The dynatron is therefore not advised for ultra-high frequency work, in which the impedance of the oscillatory circuit is inevitably low. However, the negative resistance flaw of the tetrode was put to good use; the cancellation of positive resistance and generation of oscillations in a resonant LC circuit anode load is the basis for an extraordinarily simple and versatile oscillator circuit known as the Dynatron. Although this illustration describes "Amplified impulses passing to loud-speaker", in practice a transformer is required between the valve anode circuit and a loudspeaker, as the valve anode circuit is high impedance (high voltage, low current), whereas a loudspeaker is low impedance, requiring high current at low voltage. www.cjseymour.plus.com /elec/valves/valves.htm   (6829 words)

Quartz Resonator & Oscillator Tutorial Vig and F. Walls, "Fundamental Limits on the Frequency Instabilities of Quartz Crystal Oscillators," Proc.    Ambient pressure change (as during an altitude change) can change a crystal oscillator's frequency if the pressure change produces a deformation of the crystal unit's or the oscillator's enclosure (thus changing stray capacitances and stresses).   A change in load impedance changes the amplitude or phase of the signal reflected into the oscillator loop, which changes the phase (and frequency) of the oscillation. www.ieee-uffc.org /freqcontrol/tutorials/vig/vig_tutorial1_files/slide0214.htm   (641 words)

Modified Colpitts oscillator for driving an antenna coil and generating a clock signal - Patent 5625327 In addition, the oscillator of the present invention allows the coil-capacitor segment, i.e., the LC circuit, of the oscillator circuit to run at an optimum frequency at all times in spite of nearby metal surfaces or the lack of an inductor having a precise value of inductance. The carrier frequency is preferably generated by a simple oscillator circuit, the output of which is a low distortion signal coupled to an antenna coil for transmission to the transponder unit. The oscillator circuit utilizes a pair of transistors coupled together with a feedback loop that includes a parallel LC circuit such that the output amplitude can be as high as a factor of 20 times the supply voltage or more while maintaining a high Q, low distortion output. www.freepatentsonline.com /5625327.html   (8743 words)

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