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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]]~~.		When it comes to internet hosting leaders, HostGator is plainly a leading tier option. We freely confess here at Internet Host Coach, that HostGator ranks as a top favorite within our group. Now HostGator didn't pay us to say that.<br>In the event you loved this informative article and you would love to receive much more information relating to Hostgator 1 cent coupon ([http://support.file1.com/entries/30814940-The-Stairs-Of-Network-Hosting-Domain-Registration support.file1.com]) please visit our own site. Now lets learn why<br><br>Reliability<br><br>Just like the other hosting services we advise, HostGator has a state of the art information center with backup power generators and all of the techno goodies to make her hum. HostGator likewise went an action further and introduced a Gigabit Uplink with a Guaranteed 20mbit connection. HostGator has actually also implemented numerous layers of network protection making sure the wellness of all your info.<br><br>Price<br><br>In in our book, when it comes to internet hosting, price is a big offer. HostGator is probably the closest thing that you will discover to pulling the bunny out of the hat. HostGator is likewise well known for the fantastic endless diskspace and bandwidth they offer.<br><br>Control Panel<br><br>HostGator makes use of an exceptionally easy to navigate cPanel. The [http://www.channel4.com/news/HostGator+cPanel HostGator cPanel] is one of the a lot of user friendly full featured control panels. Just click on their link below and you can really demo their cPanel in order to get "feel" for how it operates.<br><br>Customer support<br><br>One of the reasons HostGator has actually been so effective is the truth that they offer quality customer service. HostGator provides award succeeding support 24/7/365. HostGator's aim it to solve any web hosting issue you have and offer advice that can conserve you a lot of time and cash.<br><br>Summary<br><br>Limitless disk space<br>Endless bandwidth<br>Limitless domains<br>Instant backups<br>99.9 uptime guarantee<br>WordPress friendly<br>45 day refund assure<br>Free setup<br>24/7 support<br>$50 complimentary Google AdWords<br>Site builder<br><br>Conclusion<br><br>HostGator has proven it is one of the leaders in the internet hosting market. HostGator provides top of the line consumer service and reliability. It is no mistake that HostGator is one of the fastest growing business in America.

	~~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]]~~

76.102.156.135: /* Optimized systems */

2014-01-08T08:52:55Z

Optimized systems

New page

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]].

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]]

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en>Palosirkka: added an ext link, pointed two 404 links to internet archive, ate whitespace

76.102.156.135: /* Optimized systems */