MR-preamp using collector and emitter coupling integrated capaci

Details MR-preamp using collector and emitter coupling integrated capaci MR-preamp using collector and emitter coupling integrated capaci

1998-03-20

2000-07-04

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, 330302, 330303, H03F 345

Patent

active

060844698

ABSTRACT:
A circuit and method for lowering the corner frequency of a differential preamplifier having an AC coupling circuit includes a compensation circuit to adjust the frequency response characteristics created by the AC coupling circuit. An RC network in the compensation circuit is configured to provide a canceling zero at the corner frequency of the AC coupling circuit. The RC network also provides a pole at a desired frequency lower than the corner frequency of the AC coupling circuit, in order to define the overall preamplifier corner frequency. The compensation circuit allows the capacitance in the AC coupling circuit to be significantly reduced, eliminating the need for external components or a very large integrated capacitance.

REFERENCES:
patent: 4710728 (1987-12-01), Davis

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