Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1993-09-28
1996-02-06
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341136, 341145, H03M 114, H03M 168
Patent
active
054899044
ABSTRACT:
An improved subranging or comparator circuit is provided for an analog-to-digital converter. As a subranging circuit, the circuit produces a residual signal representing the difference between an analog input signal and an analog of a digital representation. This is achieved by subdividing the digital representation into two or more parts and subtracting from the analog input signal analogs of each of the individual digital portions.
In another aspect of the present invention, the subranging circuit comprises two sets of differential input pairs in which the transconductance of one differential input pair is scaled relative to the transconductance of the other differential input pair. As a consequence, the same resistor string may be used for two different digital-to-analog converters of the subranging circuit.
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G. C. Temes, "High Accuracy Pipeline A/D Convertor Configuration," Electronic Letters, vol. 21, No. 17, pp. 762-763, Aug., 1985.
Fig. 3.1 The Pipeline A/D Converter, prior to the filing date of the present application.
Fig. 3.5 Block diagram of a general pipelined A/D converter, prior to the filing date of the present application.
Kh. Hadidi et al., "An 8-b 1.3-MHz Successive-Approximation A/D Converter," IEEE Journal of Solid-State Circuits, vol. 25, No. 3, Jun. 1990.
Kh. Hadidi et al., "A New Method of Implementing DACs in CMOS Subranging Stages," University of California, Los Angeles.
Kh. Hadidi et al., "Fast Successive-Approximation A/D Converters," University of California, Los Angeles, prior to filing date of the present application.
The Regents of the University of California
Williams Howard L.
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