Switched-capacitor circuit analog-to-digital converter

Details Switched-capacitor circuit analog-to-digital converter Switched-capacitor circuit analog-to-digital converter

1983-05-03

1985-07-16

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347NT, 340347SH, 330 9, 363 59, H03K 1302

Patent

active

045299650

ABSTRACT:
A switched-capacitor analog-to-digital converter implements a conversion scheme involving execution of an algorithmic technique of successive-approximation comprising a number of iterations dependent upon the conversion resolution desired. The algorithm used requires analog processing to produce an output voltage that is two times the output voltage resolved to realize the previous bit. The "times two" function is realized by adding the voltage of the last iteration to itself (i.e., V+V=2V). This is accomplished by storing the output voltage resolved into the previous bit and separately storing a voltage corresponding to that voltage. Both stored voltages are then transferred to an integrator circuit which adds the two voltages and produces the output voltage to be resolved into the next bit.

REFERENCES:
patent: 3251052 (1966-05-01), Hoffman
patent: 3745555 (1973-07-01), Carbrey
patent: 4290034 (1981-09-01), Fraser et al.
patent: 4306196 (1981-12-01), Dwarakanath et al.
patent: 4315227 (1982-02-01), Fleischer et al.
patent: 4438354 (1984-03-01), Haque
McCharles et al., "An Algorithmic Analog-to-Digital Converter," IEEE Int'l Solid-State Circuits Conf. Digest of Tech. Papers, pp. 96-97, (1977).
McCharles et al., "Charge Circuits for Analog LSI/", IEEE Trans. Circuits and Systems, vol. CAS-25, pp. 490-497, (Jul. 1978).

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