Programmable amplifier

Details Programmable amplifier Programmable amplifier

1977-10-26

1979-01-02

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330 86, 330110, 330282, 330284, H03G 302

Patent

active

041329570

ABSTRACT:
The gain of an operational amplifier is switched between +K dB and -K dB by switching circuit positions of the input and feedback impedances. The gain is changed in 0.1 dB steps by changing either the input or feedback impedance by a ratio of 1.0116 for each step. The gain is changed in 1.0 dB steps by changing the other of the feedback or input impedance by a ratio of 1.122 for each step. A novel two-pole switching arrangement employs the foregoing techniques to permit unambiguous gain polarity changes.

REFERENCES:
patent: 3815039 (1974-06-01), Fujisawa et al.
patent: 4048576 (1977-09-01), Blackburn et al.
Metz, "Combination Logic Cuts Parts in Digitally Controlled Amplifier", Electronics, Sep. 18, 1975, pp. 94,95.

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