| 摘要 |
An amplifier apparatus for use with a sensor includes: (a) a first and a second amplifying circuit segment coupled with the sensor and cooperating to effect substantially balanced handling of signals received from the sensor; the first amplifying circuit segment includes a first transistor device; the second amplifying circuit segment includes a second transistor device; (b) a countercurrent unit coupled with the first and second amplifying circuit segments for receiving a first indicator signal from the first transistor device and a second indicator signal from the second transistor device; the first indicator signal represents a first parameter in the first transistor device; the second indicator signal represents a second parameter in the second transistor device; the countercurrent unit provides feedback signals to at least one of the first transistor and second transistor devices to reduce input impedance of the apparatus.
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