Adaptive threshold circuit

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307268, 307359, 328147, 328164, H03K 508, H03K 5153

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active

044491026

ABSTRACT:
The adaptive threshold circuit (FIG. 1) senses the amplitude of a digital signal relative to a threshold and generates a corresponding output signal therefrom. Feedback circuitry generates a correction signal which drives the threshold toward a predetermined level in the signal-eye pattern. This predetermined level passes only through the region of intersymbol interferene in the signal-eye pattern.

REFERENCES:
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patent: 3588714 (1971-06-01), McIntosh
patent: 3721959 (1973-03-01), George
patent: 4326169 (1982-04-01), Fenderson et al.
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 4417213 (1983-11-01), Ito
M. A. Byington et al., "Design and Performance of 16-State Digital Modem" ICC Conference Record, vol. 1, 1979, pp. 5.4.1-5.4.6.
M. Washio et al., "1.6Gb/s 16-Level Superposed APSK Modem with Baseband Signal-Processing Coherent Demodulator", IEEE MTFS International Microwave Symposium, Dec. 1978, pp. 945-951.
W. B. Gaunt et al., "The D3 Channel Bank" Bell Laboratories Record, Aug. 1972, pp. 229-233.

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