Constant gain amplifier system with positive and negative feedback
OwnerFred A. Mirowinventor
Life of this patent
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Abstract
Constant and accurate signal gain systems based on controlling oscillator loop gain. A constant gain positive feedback network and an amplifier form an oscillator. Only when the oscillator loop gain is at least one does the oscillator produces an AC signal. Negative feedback of the oscillator's AC signal level is used to keep the loop gain close to or at the value of one by controlling the loop gain of the oscillator circuit. By maintaining the loop gain of the oscillator circuit substantially constant the signal gain is also maintained substantially constant.
Claims4
A constant signal gain system that applies fixed gain to an input signal to produce an output signal, consisting of:
- oscillator means for generating an AC signal having loop gain responsive to the gain control signal level;
- detector means for providing said gain control signal level proportional to said AC signal level;
- said fixed gain is responsive to said loop gain;
- said AC signal level increase causing decrease in said loop gain so as to just maintain oscillation by keeping the said loop gain close to or at one;
- and
- said fixed gain is maintained substantially constant by substantially maintaining said loop gain constant.
A constant signal gain system that applies fixed gain to an input signal to produce an output signal, consisting of:
- first circuit means responsive to said input signal which produces said output signal;
- oscillator means containing second circuit means with said second circuit means receiving a gain control signal;
- said oscillator means generating an AC signal having loop gain responsive to gain control signal level;
- detector means for providing said gain control signal level proportional to said AC signal level;
- said first circuit means is substantially identical to said second circuit means;
- said first circuit also receiving said gain control signal with said fixed gain responsive to said gain control signal level;
- said AC signal level increase causing decrease in said loop gain so as to just maintain oscillation by keeping the said loop gain close to or at one;
- and
- said fixed gain is maintained substantially constant by maintaining said loop gain substantially constant.
Dependencies are inferred from the claim text.