Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1993-07-01
1995-08-22
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
323315, 341120, H03M 110
Patent
active
054444462
ABSTRACT:
A current duplicator (10) is provided for receiving a calibration current and providing an output current to a load (10). Current duplicator (10) includes a transconductor (14) having a differentially coupled input with a parasitic capacitance for storing a differential voltage during a supply period. This parasitic capacitance also converts a difference current into the voltage during a feedback period. The difference current is equal to the difference between the output current and the calibration current. Transconductor (14) converts the voltage into the output current. The current duplicator also includes a first switch network for coupling the output current to the load (12) during the supply period. The output current remains within a predetermined amount from the calibration current during the supply period. A second switch network feeds back the difference current to the input during the feedback period at least until the output current becomes substantially equal to the calibration current.
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"Current-Mode Algorithic Analog-to-Digital Converters" by David G. Nairn & C. Andre T. Salama IEEE JSSC, vol. 25, No. 4, Aug. 1990.
"A Self-Calibration Technique for Monolithic High-Resolution DIA Converters" by D. W. J. Groeneveld, H. J. Schouwenaais, H. A. H. Termeer & C. A. A. Bastiaansen, IEEE JSSC, vol. 24 No. 6 Dec. 1989.
Gopinathan Venugopal
Varma Seema
Donaldson Richard L.
Hoff Marc S.
Sorensen Douglas A.
Texas Instruments Incorporated
Valetti Mark A.
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