Weighted current source for a digital-to-analog converter

Details Weighted current source for a digital-to-analog converter Weighted current source for a digital-to-analog converter

1996-01-04

1997-09-16

Gaffin, Jeffrey A.

Coded data generation or conversion

Converter compensation

Temperature compensation

341144, 341154, H03M 106

Patent

active

056685505

ABSTRACT:
A D/A converter having a bias circuit that supplies a well-compensated gate voltage to a weighted current source part of the D/A converter, so that any changes in component characteristics due to the manufacturing of the components making up the D/A converter or due to temperature variations in the D/A converter are compensated for to output a correct analog voltage.
The bias circuit comprises an amplifier and a p-type FET, where the drain of the p-type FET is fed back to a non-inverting input of the amplifier, and a reference voltage is applied to an inverting input of the amplifier. The bias circuit operates in a negative feedback condition, such that the non-inverting input is kept as close to the reference voltage as possible. A first resistor is connected to the drain of the p-type FET, to determine the current at the drain of the p-type FET. The weighted current source is made up of FETs having similar operating characteristics as the p-type FET of the bias circuit.

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