Integrated amplifier with adjustable offset voltage

Details Integrated amplifier with adjustable offset voltage Integrated amplifier with adjustable offset voltage

1978-12-29

1980-07-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

29577R, 29586, 330277, 330307, H03F 345, B01J 1700

Patent

active

042108756

ABSTRACT:
An operational amplifier including two parallel transistors in each of the two current paths with one of the transistors being connected to the current path by a fusible element and the other transistor being connected to the path by an impedance which does not affect the overall operation of the current path during normal operation with the current in the first direction and steers the current in the opposite direction towards the fusible element to blow the fusible element by forward biasing a normally reversed biased junction. Using bipolar transistors, the base-collector junction is forward biased to blow the fusible element. A single junction field effect transistor can be used having a plurality of parallel drain segments and the gate-drain junction is forward biased.

REFERENCES:
patent: 3761787 (1973-09-01), Davis et al.
patent: 3930304 (1976-01-01), Keller et al.

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