Oscillators – Phase shift type – With r.c. ladder-type phase shift network
Patent
1992-12-16
1995-10-17
Pascal, Robert J.
Oscillators
Phase shift type
With r.c. ladder-type phase shift network
331135, 331175, 331143, 331111, 331108B, 331DIG3, H03K 364, H03B 520
Patent
active
054594383
ABSTRACT:
This invention relates to oscillators employing a primary feedback network and a high pass filter feedback network. The feedback networks are connected between the input and output of a of a high signal gain amplifier system. The primary feedback network provides positive feedback to cause oscillation to occur and also determines the nominal frequency of oscillation. The high pass filter feedback network provides a negative feedback signal that controls the rise and fall time of the amplifier system's output signal. By varying the output signal's rise and fall time the frequency of oscillation is also changed. The high signal gain amplifier system operates with one or more amplifier stages in the non-linear region to produce a significantly distorted sine wave or pulse output signal. The variation of the frequency of oscillation with the power supply voltage variation is reduced by using the high pass filter feedback network to vary the frequency of oscillation in a opposite direction to the variations in the nominal oscillator frequency which is controlled by the primary feedback network. In addition the high frequency negative feedback can frequency stabilize the oscillator system against temperature variations when the oscillator's amplifier system uses Field Effect Transistor active elements.
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McGaughan & Leslie, "Resistance Tuned F.M. Oscillator for A.F." Proc. of the I.R.E., Waves and Electrons Section, vol. 35 pp. 974-978, Sep. 1947.
Kinkead Arnold
Pascal Robert J.
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