Capacitor feedback oscillator improved circuit

Published:2011/6/4 11:53:00 Author:John | Keyword: Capacitor, feedback oscillator | From:SeekIC

To increase the frequency of capacitor feedback oscillator circuit, it is necessary to reduce capacitance of C1 and C2 and L’s inductance. In fact, when capacitance of C1 and C2 is reduced to a certain extent, capacitor within transistor and the stray capacitors in the circuit will be incorporated into C1 and C2. Thus, the oscillator frequency can be affected. These capacitors are equivalent to input capacitor Ci and output capacitor Co in amplification circuit. The improved circuit and equivalent electrical device are shown below. Due to critical effect on capacitance by temperature and unsteady stray capacitors, it is necessary to serially set a capacitor C3 with small capacitance in the inductor branch circuit in order to stabilize the oscillation frequency. And C3 < <C1 and C3<<C2.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Automotive_Circuit/Capacitor_feedback_oscillator_improved__circuit.html

Print this Page | Comments | Reading(3)