Current feedback operational amplifier circuit

Abstract

The invention discloses a current feedback operational amplifier circuit comprising a power supply, a bias current supply unit, a first common base-common emitter current mirror, a second common base-common emitter current mirror, a static bias circuit, an input buffer stage, a voltage conversion stage and a drive output unit, wherein the drive output unit comprises a bias voltage circuit and an output buffer stage; the bias current supply unit is respectively connected with the input buffer stage through the first common base-common emitter current mirror and the second common base-common emitter current mirror and used for supplying bias current; and the static bias circuit is respectively connected with the inverted input end of the input buffer stage and the voltage conversion stage and used for stabilizing a static working point of the inverted input end. The current feedback operational amplifier circuit has the advantages of lower offset voltage, stronger on-load capacity and higher conversion rate and is beneficial to improvement of the precision and the linearity of the entire operational amplifier.

Description

technical field [0001] The invention relates to a current feedback amplifier applied to a high-power drive integrated circuit, in particular to a current feedback operational amplifier circuit. Background technique [0002] The current feedback operational amplifier circuit does not have the limitation that the gain-bandwidth product is constant, so it can linearly process larger amplitude signals and respond to higher frequency signals. However, due to the characteristics of the PNP and NPN transistors in the bipolar complementary process, it is difficult to be ideally symmetrical. For example, due to the difference in the VBE of the input stage PNP and NPN transistors, the offset voltage VOS, the bias current of the inverting input terminal and the bias current of the non-inverting input terminal Cause offset voltage, etc., resulting in large static error and low gain accuracy of the current feedback operational amplifier. Contents of the invention [0003] The purpose ...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the PNP and NPN transistors in the bipolar complementary process, it is difficult to be ideally symmetrical. For example, due to the difference in the VBE of the input stage PNP and NPN transistors, the offset voltage VOS, the bias current of the inverting input terminal and the bias current of the non-inverting input terminal Cause offset voltage, etc., resulting in large static error and low gain accuracy of the current feedback operational amplifier

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