Electronic circuit for a microphone and microphone
AssigneeTDK Corporation
InventorGino Rocca
Life of this patent
Estimating the term…
Abstract
The electronic circuit having an input stage for pre-amplifying an electrical input signal of the electronic circuit provided by a transducer. The electronic circuit has an output stage for providing a microphone output signal by processing an output signal of the input stage. The electronic circuit has an adjustable output load arranged and configured for setting a current draw of the output stage. Additionally, the electronic circuit has a measurement circuit configured to capture the output signal of the input stage and an automatic control circuit configured to adjust the adjustable output load dependent on the captured output signal of the input stage.
Claims13
An electronic circuit for a microphone, the electronic circuit comprising:
- an input stage for pre-amplifying an electrical input signal of the electronic circuit provided by a transducer, wherein a gain of the input stage is adjustable,
- an output stage for providing a microphone output signal by processing an output signal of the input stage, wherein the output stage includes a transistor amplifier with a gate coupled to an output of the pre-amplifying input stage,
- an adjustable output load arranged and configured for setting a current draw of the output stage, wherein the output load is coupled with a source of the transistor amplifier of the output stage,
- a measurement circuit coupled to the output of the pre-amplifying input stage and capturing the output signal of the input stage and
- an automatic control circuit adjusting the adjustable output load and a gain of the input stage dependent on the captured output signal of the input stage.
Dependencies are inferred from the claim text.