Logarithmic conversion circuit

Details Logarithmic conversion circuit Logarithmic conversion circuit

1997-02-13

1998-08-11

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327350, H03G 1108, G06G 724

Patent

active

057932441

ABSTRACT:
A logarithmic conversion circuit includes a narrow band generating unit consisting of a local oscillator (104) and a mixer (103) for receiving an output of the local oscillator and the input signal and a first band-pass filter (105) connected to the mixer for generating a narrow band signal from a broad band input signal; a selection member (106-7) directly connected to the first band-pass filter for selecting either the input signal or the narrow band signal; first and second LOG amps (108, 111) connected in series to the selection member; and a noise suppression unit connected in parallel between the first and second LOG amps and including a second band-pass filter (109) for transmitting only the broad band input signal and a low-pass filter (110) for transmitting only the narrow band signal.

REFERENCES:
patent: 3599104 (1971-08-01), Pell
patent: 4215344 (1980-07-01), Phillips, Jr.
patent: 5027121 (1991-06-01), Hulland
patent: 5666429 (1997-09-01), Urbanski

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