D.C. coupled impedance reducing circuit

Details D.C. coupled impedance reducing circuit D.C. coupled impedance reducing circuit

1971-03-08

1976-01-27

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

328145, H03F 338

Patent

active

039355403

ABSTRACT:
Small current signals (0.5 ua and less) such as the output of a photodiode are direct current coupled to a preamplifier which also passes an impedance reducing injection current to a pair of amplifiers. A voltage output proportional to the logarithm of the signal current is produced by passing the amplified current through a log producing junction of a transistor. However, to produce the logarithm function accurately, the injected or impedance reducing current is precisionally removed so that only a very minute portion (one part out of 5000) passes through the log producing junction.

REFERENCES:
patent: 2877348 (1959-03-01), Wade et al.
patent: 3393380 (1968-07-01), Webb
patent: 3401357 (1968-09-01), D'asaro
patent: 3437943 (1969-04-01), Mader
patent: 3502959 (1970-03-01), Stellman
patent: 3530390 (1970-09-01), Smith
patent: 3626092 (1971-12-01), Wilson

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