Discrete-time programmable-gain analog-to-digital converter...

Details Discrete-time programmable-gain analog-to-digital converter... Discrete-time programmable-gain analog-to-digital converter...

2007-09-28

2009-02-17

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S122000, C341S143000, C341S155000, C341S172000

Reexamination Certificate

active

07492296

ABSTRACT:
A discrete-time programmable-gain analog-to-digital converter (ADC) input circuit with input signal and common-mode current nulling, provides a high input impedance level substantially independent of input capacitor size and input signal gain setting. An input voltage is sampled using one or more reference capacitor(s) that have been charged with a net charge corresponding to a quantizer-controlled reference voltage in a preceding clock phase. Since the charge pulled from the input voltage source is substantially determined only by the quantization error and input noise voltage, the circuit has a high input impedance. The reference capacitor(s) may be discharged in a third clock phase, so that input-signal-dependent voltages are discharged from the capacitor(s). An additional sampling capacitor can be discharged in the first clock phase and coupled in parallel with the reference capacitor during the second clock phase, to set the gain with respect to the input voltage.

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U.S. Appl. No. 11/864,890, filed Sep. 28, 2007, Drakshapalli.

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