Digital-to-analog converter having open-loop voltage reference f

Details Digital-to-analog converter having open-loop voltage reference f Digital-to-analog converter having open-loop voltage reference f

1981-04-03

1983-04-26

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

323315, 340347M, H03K 1305

Patent

active

043814972

ABSTRACT:
An open-loop voltage reference circuit, adapted to regulate a plurality of bit switch currents within a digital-to-analog converter, includes a zener diode reference leg for developing a reference voltage. The reference leg also includes a base-emitter junction voltage multiplier for creating a compensating voltage having a temperature tracking coefficient that is equal and opposite to that of the zener diode junction voltage. The reference voltage developed by the reference leg is used to bias a temperature independent current within a slave leg, and a current mirror circuit mirrors the current within the slave leg for supplying a constant current to the reference leg. The magnitude of the reference voltage is reduced through a divider leg, and an emitter follower leg provides a low impedance bias voltage for driving the plurality of bit switch current sources. The open-loop voltage reference circuit is further adapted to compensate for second order errors caused by temperature induced variations in current gain and Early effect variations related to changes in the power supply voltage. A Gain Adjust feature is also provided for adjusting the bit switch currents without adversely affecting the regulation thereof.

REFERENCES:
patent: 3961326 (1976-06-01), Craven
patent: 4093907 (1978-06-01), Nutz

Affiliated with

Also associated with

Rating

Digital-to-analog converter having open-loop voltage reference f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital-to-analog converter having open-loop voltage reference f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital-to-analog converter having open-loop voltage reference f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1566391