Self-biased, phantom-powered and feedback-stabilized amplifier f

Details Self-biased, phantom-powered and feedback-stabilized amplifier f Self-biased, phantom-powered and feedback-stabilized amplifier f

1999-04-09

2000-12-12

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, 381121, H03F 345

Patent

active

06160450&

ABSTRACT:
A self-biased electret microphone amplifier with phantom powering which avoids the need for JFETs and depletion mode devices, both of which are not standard devices when using BiCMOS fabrication processes. Feedback is included to provide enhanced gain, dynamic range, linearity and temperature stability, without requiring filtering, large resistances or external components. A self-biased, phantom powered, differential MOSFET amplifier receives and pre-amplifies the microphone signal. Further amplification and feedback is provided by a differential amplifier and bipolar output amplifier which operates as a common emitter amplifier for the amplified microphone output signal and as an emitter follower amplifier for the feedback signal.

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Data Sheet 2SK2219, pp. 1-4.
Data Sheet 2SK1578, pp. 1-4.

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