Dual input signal summer circuit

Details Dual input signal summer circuit Dual input signal summer circuit

1992-08-07

1994-10-18

Wolfe, Willis R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307529, H03K 522, G06F 724

Patent

active

053571550

ABSTRACT:
A dual input differential signal summer combines a pair of differential input signals logarithmically to produce a differential output. The input signals are applied to a pair of differential amplifiers the outputs of which are buffered so that they do not interact. The result is an increased circuit transconductance. Where the circuit is employed in a tunable filter integrated circuit employing plural cascaded filter elements, a substantial reduction in chip power is achieved.

REFERENCES:
patent: 4429416 (1984-01-01), Page
patent: 4442549 (1984-04-01), Main
patent: 4546275 (1985-10-01), Pena-Finol et al.
patent: 5057717 (1991-10-01), Kimura
M. J. Zuber et al., "A Wide-Bandwidth, High Accuracy Logarithmic Amplifier for Line-Scan Imaging Systems," Proceedings of the IEEE 1987 Custom Integrated Circuits Conference, May 4-7, 1987.

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