Difference amplifier employing input attenuator network and powe

Details Difference amplifier employing input attenuator network and powe Difference amplifier employing input attenuator network and powe

1989-11-20

1991-08-27

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

050436759

ABSTRACT:
The apparatus includes an operational amplifier which has inverting and non-inverting inputs and an output that is a function of the voltage at the inverting and non-inverting inputs. An attenuator network is connected to the operational amplifier. The attenuator network includes circuitry for reducing a voltage of a first value at the inputs of the attenuator network to a voltage that is a fraction of the first value at the output of the attenuator network which voltage is then transmitted to the operational amplifier inputs. The attenuator network includes additional circuitry for reducing a common-mode feed-through voltage of a second value at the inputs of the attenuator network to a common-mode feed-through voltage that is a fraction of the second voltage at the output of the operational amplifier.

REFERENCES:
patent: 3530395 (1970-09-01), Prusha
patent: 3832646 (1974-08-01), Szabo et al.

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