Serial-parallel type A/D converter having reference resistor cha

Details Serial-parallel type A/D converter having reference resistor cha Serial-parallel type A/D converter having reference resistor cha

1989-08-29

1991-05-28

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, H03M 114

Patent

active

050198203

ABSTRACT:
A serial-parallel type a/d converter comprises first comparators whose one input is supplied with an input signal, for producing upper-digit signals; a circuit for supplying first different potentials determined according to arithmetic progression with respect to a reference potential to respective another input of the first comparators when the control signal is of first state, and for producing N-1 second different potentials with difference 1/N of voltage difference of first potentials over potential P (N, P: natural numbers) given by the upper-digit signals when the control signal is of second state; and N-1 second comparators whose one input is supplied with the input signal and another input is supplied with the respective second different potentials for producing lower-digit signals. A second a/d converter further comprises a circuit for additional reference potentials and additional comparators to make the lower-digit conversion range larger than one unit of the upper-digit conversion to improve conversion speed limited by settling time. Also, the upper-digit can be corrected by output from additional comparators. The number of comparators is reduced by switches for switching over from upper-digit to lower-digit potentials sent to the comparators.

REFERENCES:
patent: 3597761 (1971-08-01), Fraschilla et al.
patent: 4353059 (1982-10-01), Vaitkus et al.
patent: 4533903 (1985-08-01), Yamada et al.
patent: 4542370 (1985-09-01), Yamada et al.
patent: 4612531 (1986-09-01), Dingwall et al.
patent: 4635036 (1987-01-01), Yoshizawa
patent: 4745393 (1988-05-01), Tsukada et al.
patent: 4816831 (1989-03-01), Mizoguchi et al.

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