Logarithmic lock-in amplifier

Details Logarithmic lock-in amplifier Logarithmic lock-in amplifier

1978-12-21

1980-11-18

Heyman, John S.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

328143, 330110, 330284, 307230, H03F 310, G06G 712

Patent

active

042348510

ABSTRACT:
A technique for automatically varying the gain of a lock-in-amplifier with ogarithmically responding diodes placed in the feedback network so that the output is proportional to the logarithm of the input. Measurement of low or high level signals without manual changes of gain is then provided.

REFERENCES:
patent: 3128377 (1964-04-01), Goddard
patent: 3188493 (1965-06-01), Malagari
patent: 3210680 (1965-10-01), Farris
patent: 3264569 (1966-08-01), Lefferts
patent: 3375460 (1968-03-01), Miller

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