Impedance trim network for use in integrated circuit application

Electricity: power supply or regulation systems – Remote sensing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

323 74, 323 80, 323 94R, 323 97, 330261, G05F 308

Patent

active

041479718

ABSTRACT:
An adjustable impedance network is disclosed which is suitable to be used in monolithic circuit applications to eliminate problems caused by processing tolerances. One example of such use is to employ the impedance network in the collector circuit of a differential amplifier to eliminate input voltage offset errors. The impedance network includes a plurality of impedance elements serially coupled together between first and second terminals which in the above example would be coupled to respective collector output electrodes of the differential amplifier. Each impedance element is initially electrically shorted by a respective one of a plurality of thermally machinable metallic link. In addition, a selected number of the impedance elements are electrically shorted to a common terminal by two additional metal links which are serially connected together across said selected number of impedance elements. The impedance elements are binary weighted to provide a maximum number of trim values. A laser apparatus may be used to cut or machine appropriate links to open circuit the link to add predetermined resistance between either the first or second terminal of the network and the common terminal thereof. Thus, in the above example, resistance may be added to either collector load resistor of the differential amplifier to compensate for mismatch in the transistors comprising the amplifier.

REFERENCES:
patent: 2999202 (1961-09-01), Ule
patent: 3541430 (1970-11-01), Luger
patent: 3890610 (1975-06-01), Cahen
patent: 4016483 (1977-04-01), Rudin
Electronic Design 4, Feb. 15, 1977, "First Monolithic 12-Bit DAC Uses a New Zener Trim Technique" by D. Barnes, ISSCC Dig. of Tech. Papers, Feb. 1975, p. 193.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Impedance trim network for use in integrated circuit application does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Impedance trim network for use in integrated circuit application, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impedance trim network for use in integrated circuit application will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1748498

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.