Telephonic communications – Subscriber line or transmission line interface – Circuitry to provide a coder and decoder function
Reexamination Certificate
2007-01-09
2007-01-09
Tsang, Fan (Department: 2614)
Telephonic communications
Subscriber line or transmission line interface
Circuitry to provide a coder and decoder function
C341S144000
Reexamination Certificate
active
10447606
ABSTRACT:
A gain or input volume controller and method includes a modified R2R ladder network having a number of R2R branches, switches coupled respectively to the R2R branches, and a switch controller for respectively controlling the switches to control and provide an overall gain value for a signal. The switch controller further includes a mapper for mapping a gain control signal to the switches wherein the gain control signal respectively activates or deactivates the switches. A fine gain control stage provides a fine gain control of the overall gain value. A coarse gain control stage is coupled to the fine gain control stage. The coarse gain control stage includes the modified R2R ladder network and provides a coarse gain control of the overall gain value.
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Datar Rajendra
Hong Hua
Melanson John Laurence
Soman Manoj
Subramoniam Krishnan
Cirrus Logic Inc.
Lin, Esq. Steven
Singh Ramnandan
Tsang Fan
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