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Amplifier apparatus capable of eliminating migration voltage

An offset voltage and amplifier technology, applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve the problems affecting the performance and use range of the amplifier device 100, and the offset voltage Vos cannot be completely eliminated.

Inactive Publication Date: 2008-11-12
NOVATEK MICROELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In this way, when the amplifier device 100 operates in the offset voltage canceling mode, since the voltage value of the capacitor Cs is not equal to the value of the offset voltage Vos, the offset voltage Vos cannot be completely eliminated, thus affecting the performance and performance of the amplifier device 100. its scope of use

Method used

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  • Amplifier apparatus capable of eliminating migration voltage
  • Amplifier apparatus capable of eliminating migration voltage
  • Amplifier apparatus capable of eliminating migration voltage

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Embodiment Construction

[0049] Please refer to figure 2 , figure 2It is a schematic diagram of an amplifier device 20 capable of eliminating offset voltage according to an embodiment of the present invention. The amplifier device 20 includes an offset voltage canceling device 200 , an input stage circuit 202 , an output stage circuit 204 , a dummy output stage circuit 206 , a switching circuit 208 and a voltage output terminal 210 . The offset voltage canceling device 200 includes an input voltage receiving terminal 211, a first output terminal 212 and a second output terminal 214, which are used to receive an input voltage Vi through the input voltage receiving terminal 211, and compensate the offset voltage according to an operation mode. The effect of the offset voltage is used to output the offset voltage compensation result to the input stage circuit 202 through the first output terminal 212 and the second output terminal 214, and the input stage circuit 202 can output a pre-amplified signal ...

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Abstract

An amplifier installation which can remove the offset voltage comprises an offset voltage removing device, an input stage circuit, an output stage circuit, a false output stage circuit, a commutation circuit and a voltage output terminal. The commutation circuit is coupled to a part among the input stage circuit, the output stage circuit and the false output stage circuit, is used for choosing according to an operation mode to conduct one preamplifier signals which are outputted by the input stage circuit to the output stage circuit and to feed back a first feedback voltage which is outputted by the output stage circuit to the input stage circuit; or to conduct the preamplifier signals which are outputted by the input stage circuit to the false output stage circuit and to feed back the second feedback voltage output by the false output stage circuit to the input stage circuit.

Description

technical field [0001] The present invention relates to an amplifier device capable of eliminating offset voltage, in particular to an amplifier device which utilizes a dummy output stage circuit to ensure that stored offset voltage is not affected by load, thereby completely eliminating the influence of offset voltage. Background technique [0002] An operational amplifier is an important circuit component in various electronic devices, and it is widely used in home appliances, industrial and scientific instruments and other fields. Circuit designers can often use operational amplifiers to implement many different operational functions such as buffers, filters, analog-to-digital converters, and more. [0003] An ideal operational amplifier has the following characteristics: infinite input impedance, zero output impedance, infinite open-loop gain, infinite Common Mode Rejection Ratio, and infinite bandwidth. However, due to the limitations of semiconductor technology and in...

Claims

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Application Information

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IPC IPC(8): H03F1/30
Inventor 颜志仁
Owner NOVATEK MICROELECTRONICS CORP
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