Analog-digital converter with pipeline folding scheme

Details Analog-digital converter with pipeline folding scheme Analog-digital converter with pipeline folding scheme

2005-09-27

2005-09-27

Jeanpierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S156000

Reexamination Certificate

active

06950051

ABSTRACT:
Provided is a pipelined folding analog-digital converter, the pipelined folding analog-digital converter comprising: a first sample-and-hold unit that samples and outputs a number of analog input voltages; a reference voltage generator that generates a number of reference voltages; a pre-amplifier that amplifies and outputs a number of values subtracting each reference voltage from the outputs of the first sample-and-hold unit, wherein an offset effect due to asymmetry of the amplifier is eliminated; a first folder that folds and outputs a number of outputs of the pre-amplifier; a second sample-and-hold unit that samples and outputs a number of outputs of the first folder; a second folder that folds and outputs a number of outputs of the second sample-and-hold unit; and a comparator that performs a comparison operation between the outputs of the pre-amplifier and the output values of the second folder to find a digital output value, whereby the offset caused by the device mismatch is removed, so that it is possible to realize a high-resolution analog-digital converter.

REFERENCES:
patent: 6452529 (2002-09-01), Li
patent: 6614375 (2003-09-01), Hochschild
patent: 2002-72627 (2002-09-01), None
Myung-Jun Choe,et al.; “An 8-b 100-MSamaple/s CMOS Pipelined Folding ADC”; IEEE Journal of Solid-State Circuits, vol. 36, No. 2 ; Feb. 2001; pp. 184-194.
Yun-Ti Wang,et al.; “An 8-bit 150-MHz CMOS A/D Converter”; IEEE Journal of Solid-State Circuits, vol. 35, No. 3 ; Mar. 2000; pp. 308-317.

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