Numerically controlled oscillator

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Topic: Numerically controlled oscillator

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	Numerically-controlled oscillator - Wikipedia, the free encyclopedia
		A numerically controlled oscillator or digitally controlled oscillator (DCO) is an electronic system for synthesizing a range of frequencies from a fixed timebase.
		Note: the term "digitally controlled oscillator" has also been used to describe the combination of a voltage-controlled oscillator driven by a control signal from a digital-to-analog converter.
		The term "digitally controlled oscillator" IS used to describe an analogue oscillator that is digitally controlled.
	en.wikipedia.org /wiki/Numerically-controlled_oscillator (330 words)

	25367.980611&ELEMENT_SET=DECL
		A circuit according to claim 4 or 5, c h a r a c - t e r i z e d in that the central numerically controlled oscillator (12) is arranged in the same manner as the nu- merically controlled oscillators (11) in the phase-locked loops.
		The numerically controlled oscillator is designed as a programmable divider which divides the system clock signal of the 77.76 MHz.
		The numerically con- trolled oscillator is capable of generating a clock sig- nal in phase-locked relationship with an external refer- ence signal by division of the system clock signal, and the system clock signal may periodically be locked to a selected one of the phase-locked loops.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/25367.980611&ELEMENT_SET=DECL (2545 words)

	37468.010525&ELEMENT_SET=DECL
		Numerically controlled oscillator 117 establishes an output frequency based on a number provided by processor 115 and the frequency of reference clock 119.
		The output of the numerically controlled oscillator 117 is the local clock of destination node 105 and, by means of an adaptive algorithm, is locked to service clock 101.
		The numerically controlled oscillator 117 is then set to a frequency equal to the lowest frequency allowed by specification for service clock 101.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/37468.010525&ELEMENT_SET=DECL (2827 words)

	EDN Access--09.12.97 Push numerically controlled oscillators beyond their limits
		NCOs generate sine-wave outputs, but a square-wave output is more useful when you use the NCO as a data-clock generator.
		So, NCO manufacturers divide the accumulator into many 4-bit sections, because it is not difficult to perform a 4-bit addition with carry propagation and generation in that time.
		NCO makers tout useful outputs as high as 40% of the clock frequency.
	www.edn.com /archives/1997/091297/19df_03.htm (4246 words)

	inst_rs.txt
		This subsystem is controlled by the Receiver-Exciter Controller (REC) which communicates directly with the DMC for predicts and OCI reception and status reporting.
		Control of most of the DSCC subsystems, as well as the handling and displaying of any responses to control directives and configuration and status information received from each of the subsystems, is done through the DMC.
		The NCO phase and frequency are updated every millisecond by the RT and are selected so that the center frequency of the desired portion of the 16 MHz channel is down-converted to 0 Hz.
	pds-geosciences.wustl.edu /missions/odyssey/catalog/inst_rs.txt (4879 words)

	oscillatori
		This kind of RF voltage controlled oscillator is tuned across its band by a "clean" dc voltage applied to the varactor diode to vary the net capacitance applied to the tuned circuit.
		A voltage controlled oscillator or as more commonly known, a VCO, is an oscillator where the control voltage controls the oscillator output frequency.
		Oscillator lowers distortion and phase noise - this low-distortion crystal oscillator is essentially a modified Clapp oscillator that uses a four-transistor voltage follower instead of a single transistor and connects the crystal to a virtual ground at node G
	www.messaggeri.it /xoscillatori.htm (3924 words)

	Misc. Oscillator Types
		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.
		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.
		These systems combine a low power oven oscillator with a Rubidium standard that is normally off.
	www.wenzel.com /documents/other.html (436 words)

	Atomic Force Microscope Project
		To facilitate detection of this resonant frequency shift, a tracking oscillator is formed by feeding back the phase lag between an applied sinusoidal signal on the tuning fork and the current monitored through it to a numerically controlled oscillator.
		Another PID control algorithm is used whose output is sent via a 16-bit D/A to the z-piezo, thus maintaining a constant tip-sample distance by shifting the frequency to the set point.
		Another closed-loop controller is then formed via the DSP by creating a digital error signal based on the difference between the free-running resonant frequency and a frequency set point.
	www.enme.umd.edu /ice_lab/afm/afm.html (440 words)

	Numerically-controlled nyquist-boundary hopping frequency synthesizer (US6252464)
		a numerically-controlled oscillator receiving the clock frequency and producing a digital reference signal representing the phase of an alias of the desired output signal, the alias having a frequency within a reference frequency band disposed within the Nyquist sampling-limits of the clock frequency;
		a phase control circuit coupled to the numerically-controlled oscillator and to the output phase sampler and producing a control signal representing a combination of the digital reference signal and the digital phase signal; and
		a voltage-controlled oscillator coupled to the phase control circuit and generating the output signal responsive to the control signal, whereby the output signal frequency is controlled by a combination of the desired output signal alias and the sampling-induced output signal alias.
	www.delphion.com /details?pn=US06252464__ (338 words)

	Hypersignal Block Diagram Function Reference - Support
		NCO (Numerically controlled oscillator) block generates sinusoidal signals (output CH0 and CH2) with frequencies governed by the amplitude (voltage) of the input signal.
		Numerically Controlled Oscillator - generates sinusoidal signals with frequencies governed by the amplitude of the input signal
		Amplitude specifies a value that is used to define the numerical maximum range of data that is to be generated by the block component.
	www.hyperception.com /support/php/block/FunctionRef.php?block=NCO (335 words)

	NSA Patent 5,812,609 - 1998
		One numerically controlled oscillator/modulator is used in conjunction with two integrated circuits of the second type to implement a single digital drop receiver.
		The output 16 of the numerically controlled oscillator/modulator 15 is connected to a first digital decimation filter 17 and a second digital decimation filter 18.
		The controller that controls the first digital drop receiver in the first tier is also connected to the second digital drop receiver in the second tier.
	www.ussrback.com /crypto/nsa/nsa-patents/nsa5812609.htm (4380 words)

	Numeric Control Oscillators
		An NCO (Numerically Controlled Oscillator) is a digital Oscillator whose frequency can be Controlled (by a Number), analogously as the frequency of a VCO can be controlled by a Voltage.
		NCO is the digital technic to calculate phase of repeitive frequency in fraction of required hertz (it the technic to chage the frequency) and use phase as index to pick amplitude from (sine or any shape) wave table,
		This type of controller is the digital technic to calculate phase of repeitive frequency in fraction of required hertz and use phase as index to pick amplitude from (sine or any shape) wave table,
	www.edaboard.com /ftopic73524.html (689 words)

	nco.v
		And this NCO seems to be off by a small percentage..?!..
		NCO Accumulator width is %0d bits, system clock period is %0d ns (%fMHz).", W_ACCUM, PERIOD_NS, sys_freq); // Program Modulo and Step for desired frequency.
		// // One type of NCO is based on the idea of a continuously wrapping modulo // counter.
	www.mindspring.com /~tcoonan/nco.v (810 words)

	NCO - Wikipedia, the free encyclopedia
		NCO Group, Inc., an international corporation that provides customer service contracting
	en.wikipedia.org /wiki/NCO (106 words)

	HSP45116 Print Friendly Device Information
		This combination of functions allows a complex vector to be multiplied by the internally generated (cos, sin) vector for quadrature modulation and demodulation.
		The signal to be down converted is the Vector Input of the CMAC, which multiplies the data by the rotating vector from the Sine/Cosine Section.
		The inputs to the Phase/Frequency Control Section consist of a microprocessor interface and individual control lines.
	www.intersil.com /cda/deviceinfo/print/0,1479,HSP45116,00.html (302 words)

	Microcontroller emulates numerically controlled oscillator - 2/21/2002 - EDN
		Microcontroller emulates numerically controlled oscillator - 2/21/2002 - EDN
		The 16C54's firmware emulates a 24-bit numerically controlled oscillator.
		With a 24-bit accumulator, the output frequency is f×N/[67108864(L+2)], where f is the clock frequency, N is the tuning control number, and L is the number of instructions in the loop.
	www.edn.com /article/CA196484.html (747 words)

	Mini Project
		Numerically Controlled Oscillator: Given an analog system, the phase recovery is often achieved using a voltage controlled oscillator that allows for precise adjustment of the carrier frequency based on the output of the phase detecting circuit.
		Due to imperfections in the transmitter, the actual carrier frequency may be slightly different than the expected frequency.
		Phase offset obtained after low pass filtering Zi-Zq:
	www-ece.rice.edu /~vaya/elec434/mproject/trans.html (635 words)

	Connexions - Search Repository
		A PLL adjusts the phase of a numerically-controlled oscillator to match that of the received signal.
		We derive the equations for a driven oscillator.
		How to calculate the energy in a simple harmonic oscillator.
	cnx.org /content/search?words=numerically-controlled+oscillator (194 words)

	: : : GLOBAL EDGE SOFTWARE LTD : : :
		The main functionality of the FPGA is to implement Numerically Controlled Oscillator and Cordic
		NCO is a programmable digital circuit that oscillates given the input of an external clock signal.
		Complementing the Board design was the FPGA design which interfaced the controls of video streaming and Gigabit MAC to the host.
	www.globaledgesoft.com /embedded_casestudy_005.htm (511 words)

	RFspace SDR-14 FAQ
		The SDR-14 uses an NCO (Numerically Controlled Oscillator) that is user controlled from 1 to 33MHz in 1Hz steps to convert a frequency band to a complex baseband signal.
		This ActiveX control and an example C++ application using it will all be provided open source as a useable control or just as an example of how to interface to the SDR-14 USB port and do FFTs etc.
		For example, setting the NCO to 15.0MHz will shift the signals centered at 15MHz into zero complex frequency samples that are then sent back to the PC as I/Q data.
	www.universal-radio.com /catalog/commrxvr/0014faq.html (776 words)

	Symbol synchronization in a continuous phase modulation communications receiver (US6466630)
		The integrated sample or an arctangent function of the filtered sample is used as a controlling input for a numerically controlled oscillator which regulates the digital sampling.
		regulating said numerically controlled oscillator with a function of said phase related signal processed by said loop filter.
		digitizing an output of a quadrature demodulator as a function of a numerically controlled oscillator;
	www.delphion.com /details?pn=US06466630__ (300 words)

	(WO 98/25367) A METHOD AND A CIRCUIT FOR GENERATING A SYSTEM CLOCK SIGNAL
		The central module (7) comprises a numerically controlled oscillator (12), and each of the phase-locked loops is adapted to transfer a digital error signal, which indicates a phase difference between the clock signal of the loop and the external reference signal of the loop, to the central numerically controlled oscillator (12).
		Each of these emits a clock signal in phase-locked relationship with an external reference signal, and they comprise a numerically controlled oscillator (11) which generates the clock signal of the loop by division of the system clock signal.
		The system clock generator (1) is adapted to lock the system clock signal to the central numerically controlled oscillator (12).
	wipo.int /cgi-pct/guest/getbykey5?KEY=98/25367.980611&ELEMENT_SET=DECL (250 words)

	NCO - TheBestLinks.com - Electronics, Military, Non-commissioned officer, Numerically-controlled oscillator, ...
		NCO - TheBestLinks.com - Electronics, Military, Non-commissioned officer, Numerically-controlled oscillator,...
		This is a disambiguation page, i.e., a navigational aid which lists other pages that might otherwise share the same title.
	www.thebestlinks.com /NCO.html (90 words)

	esp@cenet document view
		The frequency error signal (FD) is also applied to a numerically controlled oscillator (NCO), whose output signal is mixed with the intermediate frequency signal in order to reinsert the variations in the input signal carrier (Xi) in the reception path and have these available subsequently to obtain the frequency error signal (FD).
		This voltage-controlled oscillator (VCO) receives a frequency error signal (FD) to compensate the variations in the carrier of the input signal (Xi).
		Specially for application in space communications where the movements of the satellite produce shifts in the carrier frequency due to the Doppler effect and where the received signal is very weak and masked by noise.
	v3.espacenet.com /textdoc?&DB=EPODOC&IDX=EP0705011 (219 words)

	PMC-Sierra - PM7819 PALADIN® Waveshaper™ -- Digital Multi-Carrier Combiner with Crest Factor Reduction
		Controls the crest factor, or peak-to-average ratio (PAR), of a WCDMA or CDMA2000 signal while minimizing spectral regrowth, allowing the power amplifier (PA) to be driven harder yielding improved power efficiency.
		Reduces the cost and complexity of the transmitter sub-system by eliminating the need for separate transmit pulse-shaping filters and interpolators in the customer's baseband modems.
	www.pmc-sierra.com /products/details/pm7819 (257 words)

	DRS Technologies Inc. - Multi Channel Synthesizer
		The 3116 uses a timebase that is selectable between either a 10 MHz internal crystal oscillator or an external 10 MHz reference to drive a series of phase locked oscillators and dividers.
		Each synthesizer can be controlled in either PRI or frequency.
		All signal I/O and control connections are made through rear panel BNC and DB25 connectors, respectively.
	www.drs.com /products/index.cfm?gID=17&productID=434 (418 words)

	Project 4
		Objective: Perform a full design and implementation process for a Numerically Controlled Oscillator (NCO) in Verilog.
		Create the design of a NCO based on the discussion in class.
		The NCO should have a 26-bit width and active low asynchronous reset and enable inputs.
	www.eece.ksu.edu /~hdl/Homework/pr4.htm (358 words)

	Untitled Document
		Method of temperature calibrating a numerically controlled oscillator using low tolerance master crystals.
		Phase locked loop with numerically controlled oscillator divider in feedback loop
		Intelligent software controlled correction of frequency tracking for a local oscillator of a receiver of a wireless device
	home.ptd.net /~wk3c/WK3C_Patents.htm (130 words)

	PowerPoint Presentation
		uAn all-digital servo would apply the digital frequency control information directly to a numerically-controlled oscillator (NCO) without D/A conversion.
	www.ieee-uffc.org /freqcontrol/tutorials/Riley_PTTI_2002_files/slide0064.htm (32 words)

	Product Folder : DAC5686 - 16 Bit 500 MSPS Dual DAC, 16x interpolation, high-performance
		The DAC5686 is a dual-channel 16-bit high-speed digital-to-analog converter (DAC) with integrated 2×, 4×, 8×, and 16× interpolation filters, a numerically controlled oscillator (NCO), onboard clock multiplier, and on-chip voltage reference.
		Unmatched gains and offsets at the RF quadrature modulator result in unwanted sideband and local oscillator feedthrough.
		An accurate on-chip 1.2-V temperature-compensated band-gap reference and control amplifier allows the user to adjust the full-scale output current from 20 mA down to 2 mA.
	focus.ti.com /docs/prod/folders/print/dac5686.html (1140 words)

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