Low frequency two phase oscillator including variable feedback i

Details Low frequency two phase oscillator including variable feedback i Low frequency two phase oscillator including variable feedback i

1974-12-12

1976-03-02

Grimm, Siegfried H.

Oscillators

Polyphase output

331135, 331183, H03B 520

Patent

active

039421317

ABSTRACT:
A low frequency oscillator including a pair of novel integrator circuits and a resistive inverter circuit electrically connected together in cascade and having ganged gain control following each integrator. The novel integrator circuit includes an operational amplifier having first and second input terminals, said first input terminal being adapted for connection to a voltage source and including a resistor between said source and terminal. A first negative feedback loop including a capacitor is electrically connected between the output of the amplifier and the first terminal. A second positive frequency independent feedback loop is electrically connected between the output of the amplifier and the second input terminal. The second feedback loop preferably includes a voltage divider having a temperature variable resistor and a pair of independent heaters for varying the resistance of said resistor.

REFERENCES:
patent: 3396346 (1968-08-01), Richman

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