Selectable trimming circuit for use with a digital to analog con

Details Selectable trimming circuit for use with a digital to analog con Selectable trimming circuit for use with a digital to analog con

1977-02-14

1979-02-06

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

307241, 340347CC, 340347M, H03K 1302

Patent

active

041386710

ABSTRACT:
The outputs of individual stages in a digital to analog converter are each trimmed by independent circuitry which includes a plurality of transistors connected to a common output terminal, the physical dimensions of each transistor being scaled in proportion to desired levels of current flow, and selectable switches connected in circuit with each of the transistors. Selectable switches are actuable to produce an output trimming current of a desired magnitude, which current is used to correct the untrimmed stage output. The invention includes circuitry for controlling the polarity of the trimming current relative to the stage, and for selectively expanding or contracting the trimming range to optimize the trimming currents for the particular characteristics of the converter. A favorable balance between trimming accuracy and the area occupied by the trimming circuitry is attained by the use of both emitter-scaled and multicollector transistors in the trimming circuits.

REFERENCES:
patent: 3872323 (1975-03-01), Frederiksen et al.
patent: 3890610 (1975-06-01), Cahen
patent: 3893017 (1975-07-01), Williams
patent: 3940760 (1976-02-01), Brokaw
patent: 3961326 (1976-06-01), Craven
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 1972, pp. I-54 to I-63, II-40 to II-45, II-64 to II-77.
Erdi, A Precision Trim Technique for Monolithic Analog Circuits, 1975 IEEE International Solid-State Circuits Conference, pp. 192, 193, Digest of Technical Papers.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-61 to II-63.

Affiliated with

Also associated with

Rating

Selectable trimming circuit for use with a digital to analog con does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Selectable trimming circuit for use with a digital to analog con, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selectable trimming circuit for use with a digital to analog con will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-893740