True differential microphone amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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C381S122000

Reexamination Certificate

active

11231092

ABSTRACT:
A differential amplifier circuit which amplifies a signal developed by a signal generating device when coupled between first and second input nodes and provides an amplified differential signal at first and second output nodes. First and second current sources source first and second current levels to the first input node and the first output node, respectively. First and second current sinks sink the first and second current levels from the second input node and the second output node, respectively. A first current amplifier controls current between the first output node and the second input node to maintain the second input node at a first bias voltage level. A second current amplifier controls current between the first input node and the second output node to maintain the first input node at a second bias voltage level. An optional feedback circuit senses a DC offset and adjusts current to compensate.

REFERENCES:
patent: 4374363 (1983-02-01), Previti
patent: 5329620 (1994-07-01), Alford et al.
patent: 6433608 (2002-08-01), Huang
Germano Nicollini and Carlo Guardiani,a 3.3-V 800-nV rms Noise, Gain-Programmable CMOS Microphone Preamplifier Design Using Yield Modeling Technique, IEEE Journal of Solid-State Circuits, vol. 28, No. 8, Aug. 1993. pp. 915-921.
Michael W. Baker and Rahul Sarpeshkar,A Low-Power High-PSRR Current-Mode Microphone Preamplifier, IEEE Journal of Solid-State Circuits, vol. 38, No. 10, Oct. 2003, pp. 1671-1678.

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