Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1986-06-30
1988-02-09
Laroche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
047243970
ABSTRACT:
A differential amplifier in which the offset voltage is adjustable and which has a zero temperature coefficient after being adjusted. The differential amplifier includes a pair of differentially connected transistors, a current mirror circuit coupled to the collectors of the pair of transistors for providing differential to single current conversion and a current source for supplying a thermal current to the interconnected emitters of the pair of transistors. The magnitude of the thermal current is proportional to absolute temperature and inversely proportional to a resistance of a given resistivity. Trimmable resistive elements are provided for adjusting any offset voltage appearing between the base electrodes of the pair of transistors to substantially zero volts with the adjusted offset voltage being temperature independent.
REFERENCES:
Karlsson, L., "On a Temperature Stabilized Wideband Op Amp", Nuclear Instruments & Methods 96, 1971, pp. 387-395.
Bingham Michael D.
LaRoche Eugene R.
Motorola Inc.
Mottola Steven J.
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