Gain and impedance switching circuit for an amplifier

Details Gain and impedance switching circuit for an amplifier Gain and impedance switching circuit for an amplifier

1978-08-23

1980-07-01

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330107, 330110, 330282, 330294, 330304, H03G 314

Patent

active

042108730

ABSTRACT:
A gain and impedance switching circuit for an amplifier includes an AF amplifier having an input impedance connected between the input terminal thereof and a reference point and a feedback circuit connected between the feedback and output terminals of the amplifier, a first series circuit consisting of a first impedance and a first ON/OFF switch and connected between the input terminal of the AF amplifier and a reference point (such as ground) and a second series circuit consisting of a second impedance and a second ON/OFF switch connected between the feedback terminal of the AF amplifier and the reference point, the first and second ON/OFF switches being ganged with each other so as to change the input impedance and the gain of the AF amplifier simultaneously.

REFERENCES:
Pieau, "Compact Electrometer has Automatic Range Switching," Electronic Engineering, Oct. 1972, pp. 71-73.

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