Logarithmic amplifying circuit

Details Logarithmic amplifying circuit Logarithmic amplifying circuit

1993-07-27

1994-06-07

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307495, 328145, 328 26, 328 32, 330253, 330 2, G06F 7556, G06F 724

Patent

active

053192648

ABSTRACT:
In a logarithmic amplifier circuit including a plurality of cascaded differential amplifiers, a plurality of blocks of logarithmic full-wave rectifiers are provided, each producing output currents having logarithmic full-wave rectification characteristics in respect to voltages of their input signals. Each logarithmic full-wave rectifier is formed by a plurality of squaring full-wave rectifiers each producing an intermediate current having squaring full-wave characteristics. A current adder is provided for each or a group of the squaring full-wave rectifiers to add up the intermediate currents thereof and produce an output current. A common adder is provided for adding the output currents from all logarithmic full-wave rectifiers to produce a current output signal.

REFERENCES:
patent: 4680553 (1987-07-01), Kimura et al.
patent: 4972512 (1990-10-01), Garskamp
patent: 4990803 (1991-02-01), Gilbert
patent: 5049829 (1991-09-01), Garskamp et al.
patent: 5057717 (1991-10-01), Kimura

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