A/D converter comprising encoder portion having function of mult

Details A/D converter comprising encoder portion having function of mult A/D converter comprising encoder portion having function of mult

1988-02-11

1990-02-20

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341161, H03M 114

Patent

active

049030272

ABSTRACT:
An A/D converter of a serial-parallel comparison type has both multiplying functions of an analog input data and a digital input data. The analog input data V.sub.X is converted into a digital code I.sub.c corresponding to two more significant digits, by a first parallel comparing portion and a first determining circuit, and converted into a digital code I.sub.f corresponding to two less significant digits by a second parallel comparing portion and a second determining circuit. The digital codes I.sub.c and I.sub.f are alternately applied to a control circuit by a first selector circuit. Two more significant bits R.sub.c and two less significant bits R.sub.f of a 4-bit digital input data are respectively applied to a control signal generating circuit by a second selector circuit. Multiplications of R.sub.c I.sub.c, RfIc, R.sub.c I.sub.f and R.sub.f I.sub.f are serially performed within the time period of one conversion by the control signal generating circuit and the control circuit. The multiplied results are shifted four bits, two bits, two bits and 0 bits, respectively, and then, added to each other. As a result, the product of the analogue input data and the digital input data is calculated.

REFERENCES:
patent: 4131885 (1978-12-01), Ninomiya
patent: 4291387 (1981-09-01), Buchanan et al.
patent: 4517550 (1985-05-01), Nakamura et al.
patent: 4635036 (1987-01-01), Yoshizawa
patent: 4733217 (1988-03-01), Dingwall
Hnatek, "A User's Handbook of D/A and A/D Converters", (New York: John Wiley & Sons, 1976), p. 323.

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