Digital-to-analog converter circuit using current mirror circuit

Details Digital-to-analog converter circuit using current mirror circuit Digital-to-analog converter circuit using current mirror circuit

1996-05-07

1998-04-21

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341131, 341135, 341145, 341150, H03M 166

Patent

active

057422451

ABSTRACT:
A digital-to-analog converter circuit is configured by a digital-to-analog converter receiving data of m bits (where `m` is an integer arbitrarily selected), a voltage-follower circuit containing an operational amplifier, a current-mirror circuit and a current-switching circuit. Herein, the data of m bits are extended by bits b.sub.H and b.sub.L in low-order positions thereof, wherein b.sub.H is placed in a higher order than b.sub.L. A noninverting input of the operational amplifier is connected to an output of the digital-to-analog converter; and a feedback resistor is connected between an inverting input and an output of the operational amplifier. The current-mirror circuit, using MOS transistors, provides two constant currents I.sub.H and I.sub.L in response to the bits b.sub.H and b.sub.L respectively, wherein a relationship between the constant currents I.sub.H and I.sub.L is defined by an equation of I.sub.H =2.times.I.sub.L. The current-switching circuit, which is connected between the current-mirror circuit and the voltage-follower circuit, is designed to selectively switch the two constant currents to be supplied to the inverting input of the operational amplifier in accordance with values of the bits b.sub.H and b.sub.L. Thanks to the configuration of the digital-to-analog converter circuit, the feedback resistor and the current-mirror circuit can be designed for small areas. Hence, it is possible to easily extend a number of bits without greatly enlarging the size of the digital-to-analog circuit.

REFERENCES:
patent: 4408190 (1983-10-01), Nagano
patent: 4410879 (1983-10-01), Gumm et al.
patent: 5294927 (1994-03-01), Levinson et al.
patent: 5361068 (1994-11-01), Llewellyn
patent: 5483150 (1996-01-01), Elliott et al.

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