Integrated instrumentation amplifier for below-ground inputs

Details Integrated instrumentation amplifier for below-ground inputs Integrated instrumentation amplifier for below-ground inputs

1992-07-27

1994-01-04

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330259, 330260, 123694, H03F 345

Patent

active

052764052

ABSTRACT:
An amplifier having a high input dynamic range as well as high CMRR and PSRR values and input impedance while using a single supply voltage, includes an input stage with two transistors which are biased by a constant current, preferably of less than 1 microampere, while the collectors of the transistors are kept at fixed reference voltages. The input signal applied between the emitters of the transistors is transferred to the terminals of a first resistor which is supplied with current from a circuit which mirrors the current into a second resistor, from the terminals of which the output signal is taken.
The preferred application is for forming interfaces for lambda probes fitted to catalytic converters for motor vehicles.

REFERENCES:
patent: 4232271 (1980-11-01), Dobkin et al.
patent: 4378529 (1983-03-01), Dobkin
patent: 4521739 (1985-06-01), Peterson
Electronics Letters, vol. 26, No. 8, Apr. 14, 1990, pp. 543-545 Z. Wang, "Wideband Class AB(Push-Pull) Current Amplifier in CMOS Technology".
IEEE Journal of Solid-State Circuits, vol. 16, No. 6, Dec. 1981, pp. 677-681 B. D. Miller, et al., "Instrumentation Amplifier IC Designed For Oxygen . . . "

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