Receiver for differential and reference voltage signaling...

Details Receiver for differential and reference voltage signaling... Receiver for differential and reference voltage signaling...

2009-03-12

2010-11-30

Trinh, Sonny (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S130000, C455S333000

Reexamination Certificate

active

07844243

ABSTRACT:
In one embodiment of the invention, a receiver has two mux circuits, two receiver circuits, and a mixer. The muxes select first and second input signals for the receiver circuits. A p-type transistor in a transmission gate in each mux is connected (i) at its channel nodes between a pad and the mux output and (ii) to receive a control signal at its gate node. Control circuitry for the p-type transistor implements a threshold reduction filter that ensures that a maximum voltage level at the mux output is at least a threshold below the mux's power supply voltage. Based on first and second input signals, the first receiver circuit generates first and second intermediate signals, and the second receiver circuit generates third and fourth intermediate signals. The mixer circuit combines the intermediate signals to generate first and second output signals, wherein the first and second receiver circuits effectively operate over different ranges of common-mode voltages.

REFERENCES:
patent: 5486777 (1996-01-01), Nguyen
patent: 6344958 (2002-02-01), Morrill
patent: 6462852 (2002-10-01), Paschal et al.
patent: 6538867 (2003-03-01), Goodell et al.

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