US Patent Application No: 2012/0188,109

Number of patents in Portfolio can not be more than 2000

Track and Hold Amplifiers and Digital Calibration for Analog-to-Digital Converters

ALSO PUBLISHED AS: 8350738

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Abstract

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An exemplary differential track and hold amplifier includes a track stage including first and second linearized pairs connected in series at their respective inputs and in parallel at their respective outputs. The differential track and hold amplifier also includes a hold stage selectively coupled to the outputs of the first and second linearized pairs. The hold stage includes a unity gain buffer with feedback having a hold capacitor interconnected across its outputs. The differential track and hold amplifier also includes an output buffer coupled to the outputs of the hold stage. An exemplary analog-to-digital converter includes a differential track-and-hold amplifier, a voltage ladder, and a plurality of slices. Each of the slices in turn includes a differential preamplifier coupled to the track-and-hold amplifier and to a corresponding location on the voltage ladder; a current mode logic latch comparator coupled to the differential preamplifier; a large-swing latch coupled to the current mode logic latch comparator; a complementary metal oxide semiconductor latch having a dummy load; a calibration digital to analog converter connected across outputs of the differential preamplifier to inject calibration currents; and a register coupled to the calibration digital to analog converter and storing calibration values for use thereby. The analog-to-digital converter also includes a multiplexer which multiplexes outputs of the complementary metal oxide semiconductor latches down to a predetermined number of outputs.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INTERNATIONAL BUSINESS MACHINES CORPORATIONARMONK, NY77159

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Deniz, Zeynep Toprak - 6 12
Plouchart, Jean-Olivier New York, NY 29 79
Sanduleanu, Mihai Adrian Tiberiu 5656 AA Eindhoven, NL 58 105

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
8,350,737 Flash analog to digital converter with method and system for dynamic calibration 2 2011