Successive approximation analog-to-digital converter

Details Successive approximation analog-to-digital converter Successive approximation analog-to-digital converter

1982-05-12

1986-02-18

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307261, 307360, 307296R, H03K 500, H03K 5153

Patent

active

045715076

ABSTRACT:
A successive approximation analog-to-digital converter utilizes an improved high-gain current comparator having a zero input impedance characteristic in combination with an equal current digital-to-analog converter. The zero input impedance comparator permits the use of low power C-MOS switching circuitry by leading the output of the digital-to-analog converter to the zero impedance input of the comparator, thereby overcoming the problem of decreased switching speed associated with high capacitance C-MOS outputs. The zero impedance current comparator includes an improved current-to-voltage converter having an overdrive shunt circuit to reduce quiescent current and to permit higher value load resistors for better gain; and cascaded current cells to provide increased gain.

REFERENCES:
patent: 4147943 (1979-04-01), Peterson

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