Integrated instrumentation amplifier for below-ground inputs
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Jul 27, 1992
filing date -
Jul 29, 1991
priority date (Note) -
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status (Latency Note)
Importance
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.
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