(Sin X)/X correction circuit for a sampled data system

Details (Sin X)/X correction circuit for a sampled data system (Sin X)/X correction circuit for a sampled data system

1980-04-10

1982-03-16

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 34, 375 60, 328162, H03K 1332

Patent

active

043205194

ABSTRACT:
A sampled data system having improved (sin X)/X correction is provided. A modified switched capacitor filter is used as a receive filter. The switched capacitor filter is modified in a manner to provide a charge gain thereby avoiding the increase in thermal noise normally associated with voltage gain amplification. The modified switched capacitor filter does not impair the dynamic range of the system and can be made duty cycle independent by providing additional controllable switches to the filter.

REFERENCES:
patent: 3649924 (1972-03-01), Lucas
patent: 4179665 (1979-12-01), Gregorian
patent: 4229703 (1980-10-01), Bustin
Herbert Taub & Donald Schilling, Principles of Communication Systems, 1971, pp. 7, 8, 168-174 (McGraw-Hill Book Company).
Member of Technical Staff of Bell Telephone Laboratories, Transmission Systems for Communications, 1970, pp. 566-570.
Gray, Senderowicz, Ohara, Warren, "A Single-Chip NMOS Dual Channel Filter for PCM Telephony Applications, Dec. 1979, vol. SC-14, p. 986.
Gregorian, Nicholson, Journal of Solid-State Circuits, Dec. 1979, vol. SC-14, No. 6, 1979, p. 974.
IEEE Journal of Solid-State Circuit, vol. SC-12, No. 6, Dec. 1977, by J. Terry Caves, Miles A. Copland, p. 592, "Sample Analog Filtering Using Switch Capacitor and as Resistor Equivalents".
IEEE Int-Solid State Circuit Conf., vol. XXII, No. (1979-02), by Gregoria, Haque, Mao, Blasio and Nicholson, Sessions II, Telecommunication Circuit Techniques Wamzl, "CMOS Switched-Capacitor Filter for a Two Chip PCM Voice Codex".

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