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Dynamically biased amplifier

An amplifier and bias technology, applied in amplifiers, parts of amplifying devices, improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as increasing output stage power consumption, increasing DC bias current, etc. The effect of improving frequency response and linearity and sensitivity

Active Publication Date: 2011-10-19
INVENSENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, increasing the DC bias current and thus increasing the power dissipation of the output stage under large signal conditions improves the load handling capability required to provide the proper output voltage and current to the load

Method used

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Examples

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Embodiment Construction

[0025] figure 1A transducer amplifier 1 in the form of an integrated circuit microphone preamplifier is shown. An integrated circuit microphone preamplifier 1 or microphone preamplifier comprises an input stage 2 (indicated as stage 1) which is operatively connected to an electro-acoustic microphone such as a miniature condenser microphone for a mobile terminal via a microphone input terminal Vin. Transducer signal terminals for a transducer (not shown). A coupling capacitor Cin is coupled between the microphone input terminal and the input stage 2 to provide DC isolation therebetween. In one embodiment of the invention, the input stage has an input impedance greater than 10GΩ, such as greater than 100GΩ, to match the very large generator impedance of the miniature condenser microphone, so that the transducer signal generated by the miniature condenser microphone Attenuation is minimized. The impedance of this latter generator may correspond to a capacitor having a value be...

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Abstract

The present invention relates to an amplifier comprising an input stage and an output stage with a dynamic biasing arrangement wherein respective levels of DC bias currents supplied to the input stage and the output stage are adjusted in opposite directions.

Description

technical field [0001] The present invention relates to an amplifier comprising an input stage and an output stage with a dynamic bias arrangement, wherein the levels of the respective DC bias currents supplied to the input stage and the output stage are adjusted in opposite directions. Background technique [0002] Amplifiers for amplifying voltage or current signals are widely used ranging from infrasound frequencies to the GHz range for advanced wireless communication systems. Transducer amplifiers are an important type of amplifier in situations where it is necessary to sense, amplify, and otherwise process electrical signals representing physical quantities or variables such as sound pressure, acceleration, temperature, pressure, etc. Transducer amplifiers are used in miniature microphones and speakers for mobile terminals and other portable communication devices such as mobile phones, headsets and hearing aids. Portable devices typically run on rechargeable batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30
CPCH03F1/301
Inventor 延斯·约尔延·戈德·亨里克森
Owner INVENSENSE