Integrated circuit employing quantized feedback

Details Integrated circuit employing quantized feedback Integrated circuit employing quantized feedback

1996-03-15

1998-01-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327312, 327306, 327317, 327551, 327558, 327 24, 327559, H03K 500, H03K 508

Patent

active

057083894

ABSTRACT:
An integrated circuit employing quantized feedback is capable of compensating for decay in capacitively-coupled digital signals. In an exemplary embodiment, the integrated circuit includes a quantized feedback receiver connected to a capacitively-coupled integrated circuit input. The capacitively-coupled input produces a decaying signal for corresponding intervals of an input digital signal that are substantially DC voltages. Longer sequences of consecutive data bits of the same logic state in the input signal are represented by a corresponding longer DC voltage signals resulting in a greater decay in the capacitively-coupled signal. The receiver operates by generating a complementary feedback signal which is combined with the capacitively-coupled signal. The feedback signal is generated with a magnitude rate of change that compensates for the decay in the capacitively-coupled signal such that the digital information in the combined signal can be detected substantially without error due to the decay.

REFERENCES:
patent: 3815033 (1974-06-01), Tewksbury
patent: 4859883 (1989-08-01), Badinal
patent: 5483552 (1996-01-01), Shimazaki et al.
D. Salzman, et al. "Capacitive Coupling Solves the Known Good Die Problem" IEEE Multi-Chip Module Conference, MCMC-94, Santa Cruz, CA, pp. 95-99 (Mar. 15-17, 1994).
D. Dalzman, et al. "Application of Capacitive Coupling to Switch Fabrics" IEEE Multi-Chip Module Conference, MCMC-95, Santa Cruz, CA, pp. 195-199, (Jan. 31, 1995).
W. R. Bennett, "Synthesis Of Active Networks" Presented at the Symposium On Modern Network Synthesis, Polytechnic Institute of Brooklyn, pp. 45-61, (Apr. 13-15, 1955).

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