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Topic: Colpitts oscillator


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In the News (Wed 19 Jun 19)

  
  www.oscillatorguide.com - Oscillator
Oscillators are devices that are used to generate repetitive signals.
Oscillation is the periodic variation, typically in time, of some measure as seen, for example, in a swinging pendulum.
For example, a quartz watch uses a quartz oscillator to keep track of what time it is. An AM radio transmitter uses an oscillator to create the carrier wave for the station, and an AM radio receiver uses a special form of oscillator called a resonator to tune in a station.
www.oscillatorguide.com   (425 words)

  
 Quartz crystals :: crystal oscillator data from International Crystal
An oscillator is an amplifier with a feedback loop from output to input.
Barkhausen criteria states that for oscillation to occur the product of the gains around a loop must be equal to or greater than unity and that the sum of the phase shifts around the loop must be a multiple of 360°.
The oscillating loop C1 in parallel with R2, Ctrim in parallel with C2 and Rc and the crystal is directly tied to the load causing poor load stability.
www.icmfg.com /crystaloscillatordata.html   (882 words)

  
 www.oscillatorguide.com - Hartley Oscillator
The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor (the tank circuit).
The two versions of this oscillator are the series-fed and the shunt-fed. The main difference between the Armstrong and the Hartley oscillators lies in the design of the feedback (tickler) coil.
Hartley oscillator are inductively coupled, variable frequency oscillators where the oscillator may be series or shunt fed. Hartley oscillators have the advantage of having one centre tapped inductor and one tuning capacitor.
www.oscillatorguide.com /hartley-oscillator.html   (266 words)

  
 Voltage-controlled oscillator invention
The cross-coupled LC voltage-controlled oscillator 100 is typically coupled to the differential buffer 102 for differentiating the single-ended outputs of the cross-coupled LC voltage-controlled oscillator 100.
The oscillating frequency of the cross-coupled LC voltage-controlled oscillator 100 is dependent on the capacitance of both varactors Dv, the inductance of inductor L1 and accompanying parasitic capacitance and inductance associated with the varactor Dv and inductor L1 respectively.
The oscillating frequency of the Colpitts oscillator 200 is dependent on inductor L1, capacitors C1 and C2 and associated parasitic inductance and capacitance.
www.freshpatents.com /Voltage-controlled-oscillator-dt20060223ptan20060038628.php   (1207 words)

  
 Science Fair Projects - Colpitts oscillator
A Colpitts oscillator, named after its inventor Edwin H. Colpitts, is one of a number of designs for electronic oscillator circuits.
A Colpitts oscillator is the electrical dual of a Hartley oscillator.
The frequency of oscillation is as given in the prevous section.
www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Colpitts_oscillator   (645 words)

  
 Colpitts oscillator Information - colpitts oscillator
One of the key features of this circuit analysis of a colpitts oscillator type of oscillator is its simplicity and robustness.
A Colpitts oscillator is the electrical dual colpitts oscillator of a Hartley oscillator.
In the Colpitts circuit, two capacitors and one inductor determine the frequency of oscillation.
www.inanot.com /Ina-Electronics_Topics_Co_-_Cz-/Colpitts_oscillator.html   (598 words)

  
 Included Footer for Requirements Discussion   (Site not responding. Last check: )
An oscillator is a device for producing ac power, the output frequency of which is determined by the characteristics of the device.
There are some requirements for the harmonic oscillation, that there should be an active element producing amplification, a positive feedback should lead to negative resistance, a frequency selective network which mainly determines the oscillation frequency and a nonlinearity, which is called limiting to maintain the oscillation amplitude in stable equilibrium.
Hartley oscillators are inductively coupled; variable frequency oscillators where the oscillator may be series or shunt fed. Hartley oscillators have the advantage of having one centre tapped inductor and one tuning capacitor.
www.ee.ryerson.ca /~akhan/Theory.htm   (1225 words)

  
 Interrogator for electronic identification system - Patent 6204750
An interrogator according to claim 3, wherein the first oscillator is a Colpitts oscillator arranged to be unstable and the second oscillator is a voltage controlled oscillator.
Suppose now that the transponder 12 is modulated to change the Q factor of the system; the frequency of the Colpitts oscillator changes by a small value, and this frequency change is measured by utilising the error signal.
The variations with time of V.sub.3, the input from the Colpitts oscillator, of V.sub.5, the input from the divider 44; and of V.sub.3 -V.sub.5, the output of the phase discriminator 40, are shown.
www.freepatentsonline.com /6204750.html   (2027 words)

  
 http://blogs.cjb.net/emily/   (Site not responding. Last check: )
The Clapp oscillator is one of several types of electronic oscillator constructed from a transistor (or vacuum tube) and a positive feedback network.
The Clapp oscillator is a Colpitts oscillator with an additional capacitor placed in series with the inductor.A clapp oscillator is in effect a series tuned version of the colpitts oscillator.
The 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.
blogs.cjb.net /winona/73701   (2105 words)

  
 Electronics 16
The simplest crystal oscillator is the Pierce oscillator, shown in the figure on the left.
The amplitude of oscillation at the drain was 24 V with R = 1k, the RF voltage across the choke reversing in direction during the cycle.
Other oscillators are discussed on other pages, for example The VTVM and GDO, where the grid-dip oscillator is studied, and Vacuum Tubes, where local oscillators for superheterodynes are presented.
www.du.edu /~etuttle/electron/elect16.htm   (2560 words)

  
 Oscillator types, Wien Bridge oscillators, Crystal oscilators
Clapp oscillator Clapp oscillator, The Clapp oscillator is one of several types of electronic oscillator constructed from a transistor (or vacuum tube) and a positive feedback network,...
Colpitts oscillators Colpitts oscillators are somewhat similar to the shunt fed Hartley circuit except the Colpitts oscillator, instead of having a tapped inductor, utilises two series capacitors in its LC circuit
Hartley oscillator The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor (the tank circuit).
www.educypedia.be /electronics/analogosciltypes.htm   (721 words)

  
 Binary Revolution Forums > Colpitts oscillator frequency calculation
If you're looking for an oscillator you can tune after you build it, though, it's easier to use a variable capacitor as variable inductors are harder to come by.
In your fundamental equation for the frequency of oscillation
One can also design a Colpitts to operate at the harmonics (referred to as overtones) of a particular SAW's fundamental if higher frequencies of oscillation are required, but you should be able to locate a SAW with a fundamental anywhere from 50 MHz to a GHz or so.
www.binrev.com /forums/lofiversion/index.php?t17014.html   (1406 words)

  
 oscillators
Colpitts oscillators are somewhat similar to the shunt fed Hartley circuit except the Colpitts oscillator, instead of having a tapped inductor, utilises two series capacitors in its LC circuit.
Because of the inherent characteristics of the quartz crystal the crystal oscillator may be held to extreme accuracy of frequency stability.
Hartley oscillator are inductively coupled, variable frequency oscillators where the oscillator may be series or shunt fed. Hartley oscillators have the advantage of having one centre tapped inductor and one tuning capacitor.
www.electronics-tutorials.com /oscillators/oscillators.htm   (702 words)

  
 chet_paynter_introduct_6|Oscillators|Chapter Summary
The Colpitts oscillator is a discrete LC oscillator that uses a pair of tapped capacitors and an inductor to produce regenerative feedback.
The Hartley oscillator is similar to the Colpitts except that it uses a pair of tapped coils instead of two tapped capacitors.
The key to the operation of a crystal-controlled oscillator is the piezoelectric effect, which means that the crystal vibrates at a constant rate when it is exposed to an electric field.
wps.prenhall.com /chet_paynter_introduct_6/0,5779,426330-,00.html   (2466 words)

  
 www.oscillatorguide.com - Mcclellan Oscillator
When the oscillator reaches –100 the opposite is true and traders should be alert to a rally.
Typically, the McClellan Oscillator is juxtaposed against the New York Stock Exchange Index (NYSE), as that is considered the broadest measure of trading on that exchange.
McClellan Oscillators can be calculated on any exchange, and the Oscillator for the Nasdaq also is vital for diagnosing when that exchange is at an extreme.
www.oscillatorguide.com /mcclellan-oscillator.html   (435 words)

  
 Colpitts oscillator
Both the Armstrong and the Hartley oscillators have a tendency to be unstable in frequency because of junction capacitance.
The Colpitts oscillator is very similar to the shunt-fed Hartley oscillator, except that two capacitors are used in the tank circuit instead of a tapped coil (figure 2-15).
The major difference between the LC and RC oscillator is that the frequency-determining device in the RC oscillator is not a tank circuit.
www.tpub.com /neets/book9/35e.htm   (1351 words)

  
 Oscillator
There are a lot of oscillator circuits today, but for our purpose only LC tank harmonic oscillators are usable because we need a good frequency stability.
The first one, shown in Figure 4.1, is a Colpitts oscillator.
The oscillator is dimensioned for a differential amplitude of
n.ethz.ch /student/rodonil/da/bericht/node28.html   (262 words)

  
 Colpitts Oscillator Design
Microwave oscillator design is based on the principle of generating a negative resistance to...
for a single-ended CMOS Colpitts oscillator was undertaken.
Alternatively, the Colpitts oscillator can be analyzed in a simpler but less accurate manner, which...
colpittsoscillator.fopsoscillator.com /colpittsoscillatordesign   (723 words)

  
 Colpitts oscillator Information
A Colpitts oscillator, named after its inventor Edwin H. Colpitts, is one of a number of designs for electronic oscillator circuits.
A Colpitts oscillator is the electrical dual of a Hartley oscillator.
In the Colpitts circuit, two capacitors and one inductor determine the frequency of oscillation.
www.bookrags.com /wiki/Colpitts_oscillator   (530 words)

  
 Colpitts oscillator invention
Oscillation in which unwanted vibration (B mode) is surely suppressed while stable oscillation by principal vibration (C mode) is obtained is obtained.
[0002] The present invention relates to a piezoelectric oscillator, for example, with crystalline quartz as a piezoelectric vibrator, and particularly relates to a Colpitts oscillator which oscillates stably by principal vibration and suppresses unwanted vibration.
[0006] Therefore, in the oscillator, oscillation in the B mode as unwanted vibration becomes a problem, or a frequency jump in which the oscillation frequency changes from that of the C mode as the principal vibration to that of the B mode as the unwanted vibration becomes a problem.
www.freshpatents.com /Colpitts-oscillator-dt20061207ptan20060273860.php   (998 words)

  
 Oscillator
There are a lot of oscillator circuits today, but for our purpose only LC tank harmonic oscillators are usable because we need a good frequency stability.
The first one, shown in Figure 4.1, is a Colpitts oscillator.
The oscillator is dimensioned for a differential amplitude of
n-old.ethz.ch /student/rodonil/da/bericht/node28.html   (262 words)

  
 LC Oscillators
Oscillators, specifically electronic, are commonly found in everyday circuits, ranging from antique radios to TV transmitters.
This oscillator is very much like a RF amplifier, but a new coil, called the tickler coil, is connected between the plate and the B+, or high voltage supply.
The difference between the Armstrong oscillator and the Hartley oscillator is that the tickler coil is part of the LC circuit.
www.electronixandmore.com /articles/oscillators.html   (1219 words)

  
 Colpitts Oscillator
The Colpitts oscillator is a phase shift oscillator using inductors and tapped capacitors.
Hartley oscillators are the reactive complement for the Colpitts oscillator.
The period of oscillation is given by the volt-sec rating of the transformer core, coupled with operating voltage.
www.austincc.edu /knalty/AdvLin/14/Colpitts.html   (270 words)

  
 Caliber Electronics, Inc.
In deciding which type of oscillator is appropriate, four primary factors must be considered: the type of application (fixed or modulated); the frequency of operation; the load that the oscillator will output into; and the parts available.
A well-designed Colpitts oscillator can be utilized through the K H z range, up to approximately 130M H z.
The key to reliable crystal oscillator design is concise analysis and circuit modeling under both open loop (without crystal) and closed loop (with crystal) conditions.
www.caliberelectronics.com /oscillator-design.htm   (1587 words)

  
 HF/VHF/UHF Bandswitched Test Oscillator
The oscillator subassembly was built, dead bug style, or "Ugly Bug" style as a friend calls it, on a piece of copper clad fiberglass board, that was in turn mounted to the bottom of a two section six pole rotary switch.
The aluminum cover is connected to the oscillator subassembly ground plane with a pair of gray wires.
Listening to the signal on an FM radio receiver, the oscillator sounds quite and "feels" stable, that is to say there is little short term frequency drift.
cappels.org /dproj/bandswitchtestosc/bs_test_oscillator.html   (1523 words)

  
 Trimless IF VCO: Part 1: Design Considerations - Maxim/Dallas
The oscillator tank is a parallel-resonant circuit controlling the oscillation frequency; any change in the inductor or capacitor changes the oscillation frequency.
The Colpitts oscillator is discussed in several textbooks (Clarke and Hess 1978, Hayward 1994, Rohde 1998), and various equations have been derived to predict the behavior of oscillators in general and the Colpitts topology in particular.
Alternatively, the Colpitts oscillator can be analyzed in a simpler but less accurate manner, which provides a set of design equations that are clearer, more insightful, and useful for first-order oscillator design.
www.maxim-ic.com /an2032   (1894 words)

  
 Technology-Colpitts
Unlike the inductive bridge circuits, in the colpitts oscillator circuit the sensor acts as the resonating coil for the oscillator.
The proximity of the targets to the sensor coil pulls the oscillator, changing its frequency (small change not used) and amplitude (large change) of modulation.
The output of a colpitts circuit is typically non-linear.
www.kamansensors.com /html/technology/technology-colpitts.htm   (120 words)

  
 Colpitts crystal oscillator
What is the best configuration (common collector,common base or common emitter) at this frequency(is it common base) also taking into consideration that oscillator coupling could be by a reactive element (say a capacitive coupling to an amplifier).
If crystals Q is around 100000 (usual value), is same as free running oscillating (shorted) crystal need 100000 periods to damping 27.29 dB (1/e^2PI) - simular situation for start/rice amplitude in crystal in oscillator coupling.
Simulator have not normaly thermal noise and in starting process can weak oscillating jumping around simular state machine (depend of simulators numeric precision and time step etc.) and never find way to fire up to big oscillating.
www.edaboard.com /ftopic249977.html   (438 words)

  
 COLPITTS OSCILLATOR
Both the Armstrong and the Hartley oscillators have a tendency to be unstable in frequency because
The Colpitts oscillator is very similar to the shunt-fed Hartley oscillator, except that two capacitors
Colpitts either by varying the inductance of the coil or by varying the capacitance of the two capacitors in
www.tpub.com /content/neets/14181/css/14181_83.htm   (230 words)

  
 Methodology
In the Colpitts circuit, two capacitors and one inductor determine the frequency whereas the Hartley circuit uses two inductors and one capacitor.
This type of oscillator is excellent due to its simplicity and robustness.
Figure 3 is a circuit diagram of a common collector colpitts oscillator.
www.eng.newcastle.edu.au /~c3019952/methodology.htm   (1552 words)

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