Low drift tuning circuit

Details Low drift tuning circuit Low drift tuning circuit

1980-09-30

1983-08-09

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307491, 307494, 328127, H03K 522, G06G 718

Patent

active

043981046

ABSTRACT:
A low drift rate tuning circuit (10) is operated in conjunction with a feedback network (36). An operational amplifier (12) is connected to first and second power supply buses (18, 20). The negative input terminal (16) of the amplifier is connected to the lower voltage supply bus (20). The output of the amplifier (12) is connected to an inverting amplifier (51). The output from the circuit (10) is connected as the input of the feedback network (36) and the input to the circuit (10) is connected to the output of the feedback network (36). In the seek mode the circuit (10) balances the voltages at the input terminals of the operational amplifier (12). In the balance condition the common mode input voltage to the operational amplifier (12) is essentially zero at which voltage the input leakage current is at a minimum. With the leakage current reduced to a minimum the circuit is made more stable by reason of reduced drift over time.

REFERENCES:
patent: 3715487 (1973-02-01), Blake
patent: 3836861 (1974-09-01), Diamond
patent: 3988689 (1976-10-01), Ochi et al.
patent: 3991323 (1976-11-01), Przybylski
RCA Linear Integrated Circuits Catalog SSD-240A, pp. 244-255 (1978).

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