Switched capacitor coupled line receiver circuit
AssigneesAmerican Telephone and Telegraph Company, AT&T Information Systems Inc.
InventorRobert L. Carbrey
Life of this patent
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Abstract
A receiver circuit uses switched capacitor circuits to couple signals received over a communication facility to connected apparatus. During a first time interval a capacitor is connected across each lead of a facility to sample the facility voltages. During a second time interval these capacitors are disconnected from the facility lines and reconnected in series as the input to a voltage regenerator circuit. The regenerator circuit reconstructs the received signals for output to connected apparatus.
Claims8
A circuit for coupling signals received from a facility to communication apparatus, said circuit comprising
- a first capacitor,
- a second capacitor,
- first means for connecting a first terminal and a second terminal of said first capacitor, respectively, between a first lead of said facility and a first reference voltage during a first time interval and connecting said first and second terminals of said first capacitor, respectively, between a first terminal of said second capacitor and said first reference voltage during a second time interval,
- second means for connecting said first terminal and a second terminal of said second capacitor, respectively, between a second lead of said facility and a second reference voltage during said first time interval and connecting said first and second terminals of said second capacitor, respectively, in series between said first terminal of said first capacitor and a first input terminal of a voltage regenerator circuit during said second time interval, and
- said voltage regenerator circuit for coupling signals from said capacitors to said communication apparatus and having a second input terminal connected to said first reference voltage.
Dependencies are inferred from the claim text.