Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1994-12-28
1997-03-04
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341143, H03M 166
Patent
active
056084013
ABSTRACT:
A three-level digital-to-analog (D/A) converter receives digital signals, derives three-level control signals and generates analog signals. The three-level D/A converter comprises a control device for converting incoming digital signals to control signals having three levels, switches for switching responsive to these three levels to control a network of switches, and a load responsive to these switches to generate corresponding analog signals. The control device comprises a feedback control loop and a quantizer to produce the control signals having High, Medium and Low levels. The switches are preferably four switches that open and close cooperatively in response to the High, Medium and Low levels. The load generates a positive, zero or negative voltage reference in the analog signals in response to the operation of the four switches.
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IEEE International Solid State Circuits Conference, vol. 34, 1 Feb. 1991, pp. 74-75, 293, Toshiyuki Okamoto, "A 16b Oversampling CODEC with Filtering DSP".
European Search Report, Nov. 4, 1996.
Viswanathan Thayamkulangara R.
Williams, III Louis A.
Hoff Marc S.
Lucent Technologies - Inc.
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