Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1997-11-04
2000-02-29
Tokar, Michael
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
330 9, H03M 138, H03F 102
Patent
active
06031480&
ABSTRACT:
A pipelined analog-to-digital converter is disclosed having a plurality of sample and hold converter stages, each having an interstage amplifier (28) associated therewith. This is a differential amplifier that is implemented without common-mode feedback. The sample and hold stage operates on a reset phase and a gain/DAC phase, wherein the output of the reconstructive DAC is summed with the input to the amplifier (28). A differential input amplifier (60) has the inputs thereof set to common-mode input voltage with a feedback capacitor biased to a common-mode output bias point. During the gain/DAC phase, the bias input is removed and the feedback capacitor connected across the input/output of the amplifier (60). This effectively establishes the common-mode bias points for use by the amplifier (60) during the gain/DAC phase. Further, the differential inputs of the amplifier (60) are connected to one side of respective sampling capacitors, the other side thereof connected through a respective switch to the differential inputs. During the reset phase the input voltage is sampled onto the capacitors and, during the gain/DAC phase, the gates of the capacitors are connected together to remove any common-mode voltage from the input prior to being input to the amplifier (60).
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Lewis et al, "A Pipelined . . . Analog to Digital Converter," IEEE Journal of SOlid State Circuits, Dec. 1987.
Soenen et al, ". . . Monolithic Pipelined ADCs," IEEE Transactions on Circuits and Systems, Mar. 1995.
Sarraj Maher
Soenen Eric G.
Brady III Wade James
Donaldson Richard L.
Stewart Alan K.
Texas Instruments Incorporated
Tokar Michael
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