Operation amplifier capable of compensating migration voltage
An operational amplifier, current size technology, applied in the field of operational amplifiers, can solve problems such as component mismatch, performance impact, threshold voltage difference, etc.
Inactive Publication Date: 2008-10-01
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology
However, in practice, when the input transistors P1 and P2 are not completely matched due to certain characteristics of the process, the threshold voltages (ThresholdVoltage) of the input transistors P1 and P2 will be unequal, so that the source to gate of the input transistors P1 and P2 If the voltages of poles are not equal, the offset voltage Vos is not equal to 0, and the current Id1 and Id2 are not equal
[0006] In short, due to factors such as semiconductor physical characteristics, process defects, and component mismatches, the offset voltage of the known operational amplifier is not equal to 0, which affects its performance.
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[0044] Please refer to image 3 , image 3 It is a schematic diagram of an operational amplifier 30 capable of compensating offset voltage according to an embodiment of the present invention. The operational amplifier 30 includes an input stage circuit 300 , an output stage circuit 302 and an adjustment device 304 . The input stage circuit 300 receives voltage signals from a positive input terminal Vp and a negative input terminal Vn, and outputs corresponding currents Id1 and Id2 to the output stage circuit 302 through a first current output terminal 306 and a second current output terminal 308 . The output stage circuit 302 outputs a voltage amplification result from an output terminal Vo according to the currents Id1 and Id2 of the first current output terminal 306 and the second current output terminal 308 . In addition, in image 3 In , an equivalent voltage source 310 is used to represent the non-ideality of the operational amplifier 30 (which does not exist in the ac...
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An operational amplifier which can compensate the excursion voltage comprises the following components: an input stage circuit which includes a positive input end, a negative input end, a first current output end and a second current output end, and is used for outputting the corresponding currents by the first current output end and the second current output end according to the voltage received by the positive input end and the negative input end; an output stage circuit which is coupled between the first current output end and the second current output end of the output stage circuit, and is used for outputting voltage according to the current of the first current output end and the second current output end; and an adjusting device which is coupled between the input stage circuit and the output stage circuit, and is used for adjusting the current of the first current output end and the second current output end to compensate the effect of the excursion voltage.
Description
technical field [0001] The invention relates to an operational amplifier capable of compensating offset voltage, in particular to an operational amplifier capable of compensating the influence caused by offset voltage by adjusting the magnitude of the current between the input stage circuit and the output stage circuit in the operational amplifier. 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 se...
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IPC IPC(8): H03F1/30
Inventor 颜志仁谢致远
Owner NOVATEK MICROELECTRONICS CORP