Logarithmic converter

Details Logarithmic converter Logarithmic converter

1994-09-30

1996-01-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327351, G06F 7556

Patent

active

054812186

ABSTRACT:
A logarithmic convertor based on a nonlinear successive detection principle has a temperature-compensated biassing arrangement and a large operating range due to a d.c. feedback network for offset reduction and an attenuating input stage permitting large input voltages. The log convertor exploits the exponential relationship between the collector current and base-emitter voltage of a bipolar transistor to render the convertor insensitive to temperature and process parameter variations. The converter is a cascade of sections, each having a constant-gain differential amplifier having a particularized current source. The constant-gain amplifier may include a Darlington differential pair, and the current sources have outputs that are either temperature-independent, or proportional to temperature.

REFERENCES:
patent: 3569736 (1971-03-01), Tschinkel
patent: 3790819 (1974-02-01), Chamran
patent: 4990803 (1991-02-01), Gilbert
patent: 5200655 (1993-04-01), Feldt
patent: 5286969 (1994-02-01), Roberts
patent: 5296761 (1994-03-01), Fotowat-Ahmady et al.

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