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The '''Clapp [[electronic oscillator|oscillator]]''' is one of several types of [[electronic oscillator]] constructed from a [[transistor]] (or [[vacuum tube]]) and a [[positive feedback]] network, using the combination of an [[inductance]] (L) with a [[capacitor]] (C) for frequency determination, thus also called [[LC oscillator]].  
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It was published by [[James Kilton Clapp]] in 1948.<ref>J. K. Clapp, "An inductance-capacitance oscillator of unusual frequency stability", [[Proc. IRE]], vol. 367, pp. 356-358, Mar. 1948.</ref> According to Vačkář,<ref>Jiri Vackar, LC Oscillators and their Frequency Stability, TESLA Report 1949, ch. 4, [http://n1ekv.org/Oscillators/Vackar_wholepaper.pdf]</ref> oscillators of this kind were independently developed by several inventors, and one developed by [[Geoffrey G. Gouriet|Gouriet]] had been in operation at the [[BBC]] since 1938.
 
[[Image:Clapp oscillator.png|frame|Clapp Oscillator (direct-current biasing network not shown)]]
 
Referring to the notional circuit in the figure, the network comprises a single inductor and three capacitors. Capacitors C1 and C2 form a voltage divider that determines the amount of feedback voltage applied to the transistor input. The Clapp oscillator is a [[Colpitts oscillator]] that has an additional capacitor placed in series with the inductor. The oscillation frequency in hertz (cycles per second) for the circuit in the figure, which uses a field-effect transistor ([[Field effect transistor|FET]]), is
 
<math>
f_0 = {1 \over 2\pi}
      \sqrt{ {1 \over L}
              \left(  {1 \over C_0}
                    + {1 \over C_1}
                    + {1 \over C_2}
              \right)} \ .
</math>
 
A Clapp circuit is often preferred over a Colpitts circuit for constructing a variable frequency oscillator ([[VFO]]). In a Colpitts [[VFO]], the voltage divider contains the variable capacitor (either C1 or C2). This causes the feedback voltage to be variable as well, sometimes making the Colpitts circuit less likely to achieve oscillation over a portion of the desired frequency range. This problem is avoided in the Clapp circuit by using fixed capacitors in the voltage divider and a variable capacitor (C0) in series with the inductor.
 
== See also ==
* [[Opto-Electronic Oscillator]]
 
== References ==
 
<references/>
* Ulrich L. Rohde, Ajay K. Poddar, Georg Böck "The Design of Modern Microwave Oscillators for Wireless Applications ", John Wiley & Sons, New York, NY, May, 2005, ISBN 0-471-72342-8.
* George Vendelin, Anthony M. Pavio, Ulrich L. Rohde " Microwave Circuit Design Using Linear and Nonlinear Techniques ",  John Wiley & Sons, New York, NY, May, 2005, ISBN 0-471-41479-4.
* A. Grebennikov, RF and Microwave Transistor Oscillator Design. Wiley 2007. ISBN 978-0-470-02535-2.
 
== External links ==
* [http://whites.sdsmt.edu/classes/ee322/ EE 322/322L Wireless Communication Electronics] —Lecture #24:  Oscillators. Clapp oscillator. VFO startup
 
{{Electronic oscillators}}
 
{{DEFAULTSORT:Clapp Oscillator}}
[[Category:Oscillators]]

Latest revision as of 13:23, 6 January 2015

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