Frequency shift keyed modem chip set

Details Frequency shift keyed modem chip set Frequency shift keyed modem chip set

1981-08-28

1984-08-14

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 88, 329112, H04L 2710

Patent

active

044661061

ABSTRACT:
Integrated circuit universal frequency shift keyed modems using switched capacitor recursive filters are disclosed. The modems are comprised of two integrated circuits, the first providing the transmitting capability for any of a plurality of conventional transmit modes and the second providing a receive capability for the corresponding modes, including all filtering on chip as is required prior to detection. In this manner, any of a number of conventional modems may be realized using the two chip set and a minimum of external circuitry. Because of the versatility of the chip set, other functions and objectives may be achieved by the use thereof.

REFERENCES:
patent: 3302114 (1967-01-01), Hertog
patent: 3719779 (1973-03-01), Wilson
patent: 3937882 (1976-02-01), Bingham
patent: 4115738 (1978-09-01), Mitarai et al.
patent: 4336613 (1982-06-01), Hewes
Laker, "Equivalent Circuit for the Analysis and Synthesis of Switched Capacitor Network", A.T.T., The Bell System Technical Journal, vol. 58, No. 3, Mar. 1979.

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