Voltage subtracter circuit, voltage amplifier circuit, voltage d

Details Voltage subtracter circuit, voltage amplifier circuit, voltage d Voltage subtracter circuit, voltage amplifier circuit, voltage d

1998-04-08

1998-11-24

Wong, Peter S.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327360, G06G 742

Patent

active

058413111

ABSTRACT:
A voltage subtracter circuit of the present invention includes a constant current source 1, a first MOS transistor pair 2, one end of which is connected to a source voltage terminal, and a second MOS transistor pair 3, one end of which is connected to the constant current source 1. A first differential input voltage is applied between the gate terminals of the first transistor pair 2, and a second differential input voltage is applied between the gate terminals of the second transistor pair 3. Output terminals V1 and V2 are connected to the connecting point between the first and second transistor pairs 2 and 3. From these nodes V1 and V2, a differential voltage between the first differential input voltage and a differential voltage proportional to the second differential input voltage is outputted. According to the present invention, this voltage subtracter circuit does not have any resistors, so that the circuit can be easily integrated and operated with high accuracy without being influenced by Vth and so forth.

REFERENCES:
patent: 4124824 (1978-11-01), Kreinick et al.
patent: 4329656 (1982-05-01), Shaw
patent: 5602504 (1997-02-01), Liu

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