Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1997-09-12
1999-08-10
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341161, H03M 136
Patent
active
059365668
ABSTRACT:
The n-bit A/D converter of the present invention includes a resistor network, n comparators, and (2.sup.n -1-n) multiplexers. The resistor network generates a plurality of reference voltages characterized by uniform voltage increments between two fixed voltages. The n comparators are coupled to the resistor network. Each comparator receives a reference voltage and an analog input signal. Based on these inputs, an ith comparator generates an ith bit output in the n-bit digital signal where i ranges from 1 to n with the first bit being the most-significant-bit and the nth bit being the least-significant-bit. The (2.sup.n -1-n) multiplexers are coupled between the resistor network and the ith comparator. In response to the output of comparators (except for the first comparator) associated with the more significant bits, the (2.sup.i-1 -1) multiplexers select a reference voltage and transmit it to the ith comparator. The ith comparator then compares the selected reference voltage with the analog input signal and generates the ith bit output.
REFERENCES:
patent: 4270118 (1981-05-01), Brokaw
patent: 4306224 (1981-12-01), Geller et al.
patent: 4611196 (1986-09-01), Fernandez
patent: 4769628 (1988-09-01), Hellerman
patent: 4987417 (1991-01-01), Buckland
patent: 5014057 (1991-05-01), Mintzer
Conexant Systems Inc.
Hoff Marc S.
Yu Philip K.
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