Oscillator fine tune circuit

Details Oscillator fine tune circuit Oscillator fine tune circuit

1983-09-29

1985-12-24

LaRoche, Eugene R.

Oscillators

Phase shift type

331 34, 330109, H03B 524, H03F 134

Patent

active

045609578

ABSTRACT:
An oscillator having a circuit for fine tuning the frequency thereof while minimizing any effect on the output amplitude thereof. A state variable oscillator employs an inverter amplifier having a negative feedback resistor R.sub.f, a first integrator, and a second integrator. 180.degree. feedback from the second integrator is fed back through resistors R.sub.i and R.sub.v to an inverting input of the inverter amplifier. 90.degree. feedback from the first integrator is fed back partially through resistors R.sub.n and R.sub.v and partially through resistor R.sub.m to the inverting input, and also through resistor R.sub.c to the non-inverting input. A field effect transistor provides a common return to the non-inverting input to control oscillator amplitude. If R.sub.i R.sub.m =R.sub.n R.sub.f then R.sub.v may be adjusted to vary the frequency of the oscillator output signal without affecting its amplitude.

REFERENCES:
patent: 4145670 (1979-03-01), Bode

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