Meter drive circuit

Details Meter drive circuit Meter drive circuit

1982-05-27

1984-04-10

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

307492, 328145, 329146, 329192, 330252, 455155, 455246, 455253, H04B 126

Patent

active

044425490

ABSTRACT:
A circuit and method for producing a signal the magnitude of which varies with the logarithm of an input signal supplied to a plurality of cascaded differential amplifier stages each having substantially equal gain. As particular ones of the stages go into limiting the DC rectified voltage produced at the differential common node of each of the stages is detected to produce a plurality of currents. These currents are summed to the input of a current turn-around circuit which produces the signal at an output.

REFERENCES:
patent: 2515187 (1950-07-01), Bliss
patent: 2662978 (1953-12-01), Sunstein
patent: 3403347 (1968-09-01), Stull, Jr.
patent: 3423682 (1969-01-01), Cauchois
patent: 3435353 (1969-03-01), Sauber
patent: 3605027 (1971-09-01), Nichols et al.
patent: 3668535 (1972-06-01), Lansdowne
patent: 3673499 (1972-06-01), Avins et al.
patent: 3678405 (1972-07-01), Avins
patent: 4247949 (1981-01-01), Watanabe et al.

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