Subranging analog-to-digital converter with multiplexed input am

Details Subranging analog-to-digital converter with multiplexed input am Subranging analog-to-digital converter with multiplexed input am

1987-08-07

1988-08-09

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 134

Patent

active

047631074

ABSTRACT:
A 12 bit, 10 megahertz subranging analog-to-digital converter produces a sampled analog input signal. The sampled analog signal is converted by an MSB flash encoder to a 7 bit MSB word that is converted to an analog signal by a 7 bit DAC having 14 bit accuracy. The result is subtracted from the sample analog signal to produce a residue signal by means of a high speed amplifier having first and second multiplexed differential input stages, the first input stage having differential inputs receiving the sampled analog input signal and the analog signal produced by the 7 bit DAC. The second differential input stage has one input connected to ground and the other input resistively coupled to the output of the high speed amplifier. The output of the high speed amplifier is resistively coupled to the second input of the first and second differential stages. The multiplexed input high speed amplifier produces an intermediate input level until the output of the DAC is stable. Amplifying of the residue signal then begins from a balanced amplifier condition, and avoids delays that might result from an initial overdriven amplifier condition.

REFERENCES:
patent: 4251802 (1981-02-01), Horna
patent: 4353059 (1982-10-01), Vaitkus
patent: 4410876 (1983-10-01), Sawagata
"4-Bit Flash Chip Guarantees 100-MHz, 8-Bit System", Brian Gillings, Electronic Design, Dec. 24, 1981, vol. 29, No. 26, pp. 95-101.

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