High-speed voltage subtractor

Details High-speed voltage subtractor High-speed voltage subtractor

1979-10-09

1982-05-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

043296564

ABSTRACT:
A subtractor for use in a digital to digital converter has fast response and uses an operational amplifier. The fast response is achieved by varying current flow in associated circuits. An analog input controls current flow through a first portion of the circuitry and a voltage reference controls current flow through a second portion of the circuit. The total current flow through the first and second portions of the circuit is provided by a current source. The analog input is coupled to a first input of the operational amplifier and the voltage reference is coupled to a second input of the operational amplifier. A first logarithmic impedance is coupled between the first input of the operational amplifier and the output of the operational amplifier. A second logarithmic impedance is coupled between the second input of the operational amplifier and a bias voltage. The bias voltage is used to provide a predetermined biased voltage at the output of the operational amplifier.

REFERENCES:
patent: 4053846 (1977-10-01), Acker

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