Pulse or digital communications – Repeaters – Testing
Patent
1982-08-16
1986-02-18
Bookbinder, Marc E.
Pulse or digital communications
Repeaters
Testing
375103, H04B 138
Patent
active
045717311
ABSTRACT:
A PSK integrated circuit modem employs multi-mode filters in its switched capacitor circuitry for providing a plurality of filter response to accomodate a plurality of modem protocols. Each capacitor is selectively connected or disconnected from the circuit by a transistor switch, and selectively connected and disconnected from the circuit voltage reference by a transistor switch. The switches operate out of phase with each other so that when any capacitor is connected in the circuit, it is disconnected from the reference voltage and when any capacitor is disconnected from the circuit, it is connected to the reference voltage. The modem switch minimizes the effect of stray capacitance from the unselected capacitors and their associated transistor switches that have been turned off.
REFERENCES:
patent: 3349330 (1967-10-01), Wedmore
patent: 3373371 (1968-03-01), Fanger
patent: 3536840 (1970-10-01), Sullivan
patent: 3835406 (1974-09-01), Thompson
patent: 3937882 (1976-02-01), Bingham
patent: 4069392 (1978-01-01), Goldenberg et al.
patent: 4336613 (1982-06-01), Hewes
patent: 4338571 (1982-07-01), Young
patent: 4371797 (1983-02-01), Frank
patent: 4425665 (1984-01-01), Stauffer
patent: 4458216 (1984-07-01), Bingham
patent: 4464587 (1984-08-01), Suzuki et al.
Klinkovsky Edward R.
Severin William A.
Bookbinder Marc E.
Chin Stephen
Devine Thomas G.
Heiting Leo N.
Sharp Melvin
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