Operational amplifier with offset compensation

Details Operational amplifier with offset compensation Operational amplifier with offset compensation

1980-01-14

1981-12-15

Mullins, James B.

Amplifiers

With periodic switching input-output

H03F 102

Patent

active

043061966

ABSTRACT:
Offset voltage compensation is provided by a feedback capacitor (24) in a feedback loop (20). For periodically resetting the compensation, the signal input terminal (14) is grounded by an electronic MOSFET switch (34). Other such switches (22, 26) close the feedback loop (20) in front of the capacitor (24) and connect the output side of the capacitor (24) to ground for recharging. An input capacitor (30) for compensating the switching feed-through charge of the feedback loop switch (22) is connected between the input signal source (32) and the signal input terminal (14). The ratio of the inherent capacitances of the switches (22, 34) is equal to the capacitance ratio of their respective capacitors (24, 30). Also disclosed is a particularly advantageous method for operating the switches. For switching from the reset condition back to the transmit condition, first the feedback loop switch (22) is opened. Thereafter, the other switches (26, 31, 34) are operated.

REFERENCES:
patent: 3649924 (1972-03-01), Lucas

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