Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2006-10-03
2006-10-03
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
Reexamination Certificate
active
07116261
ABSTRACT:
To make use of its full input voltage operating range, an analog-to-digital converter is configured with a switched-capacitor circuit to produce a digital output signal from an analog input signal that lies within a range of input signal voltage. The analog-to-digital converter is configured with an amplifier with a digitally programmable gain and a voltage generator with a digitally controlled output voltage. The voltage generator is coupled through a buffer to the amplifier input and generates an output voltage inversely proportional to the amplifier gain. The amplifier gain and the voltage generator output voltage are controllable with the same digital control signal. The combination of the amplifier and the voltage generator can be configured to produce a voltage for the analog-to-digital converter that lies in a prescribed voltage range, avoiding the need to generate substantial current from the voltage generator for a switched-capacitor circuit.
REFERENCES:
patent: 5831473 (1998-11-01), Ishii
patent: 6567025 (2003-05-01), Schreier et al.
patent: 6724333 (2004-04-01), Noro et al.
patent: 6778126 (2004-08-01), Ali
Bilhan Haydar
Li Xiaopeng
Hoel Carlton H.
Young Brian
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