Programmable attenuator

Details Programmable attenuator Programmable attenuator

1983-03-15

1985-02-19

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330282, 330277, 330284, 330307, 333 81R, H03G 330

Patent

active

045008450

ABSTRACT:
An integratable programmable attenuator includes in one embodiment a plurality of field-effect transistors coupled to a semiconductor resistor at spaced apart locations thereon, the semiconductor resistor forming one of the source/drain regions of each of the transistors. The other source/drain region of each field-effect transistor is selectively coupled to an input of a differential amplifier, the output of which is coupled to one end region of the semiconductor resistor. The gain of the differential amplifier is variable in predetermined steps according to which of the transistors is selected.

REFERENCES:
patent: 4070632 (1978-01-01), Tuttle
patent: 4143383 (1979-03-01), Van Rooij et al.
patent: 4354159 (1982-10-01), Schorr et al.

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