Novel ultra-wideband operational amplifier

Abstract

The invention belongs to the field of integrated circuits, and particularly relates to a novel ultra-wideband operational amplifier which comprises a differential signal output end, a push-pull inverting amplifier and a bootstrap gain amplifier. The push-pull inverting amplifier is connected with the differential input end; and the bootstrap gain amplifier is connected with the output end of the push-pull inverting amplifier. According to the invention, a differential input end, a push-pull inverting amplifier and a bootstrap gain amplifier are adopted; the traditional differential input can inhibit the influence of common-mode noise, the push-pull inverting amplifier can realize full-swing output and provide higher input swing for the next stage, the structure also has the advantage of large bandwidth, the secondary pole and the main pole are easier to be far away from each other by forming the two-stage operational amplifier, the use of a compensation circuit can be avoided, and thebandwidth is utilized to the maximum extent; according to the bootstrap gain amplifier used in the application, the bandwidth of the operational amplifier is expanded, the power consumption is reduced, the bias circuit is reduced, and the chip area is saved.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a novel ultra-wideband operational amplifier. Background technique [0002] The operational amplifier is the key module of the high-speed and high-precision pipeline analog-to-digital converter. With the gradual increase of the sampling frequency of the analog-to-digital converter, higher and higher requirements are put forward for the bandwidth of the operational amplifier. With the development of integrated circuit technology, the continuous reduction of feature size has played a very positive role in expanding the bandwidth of operational amplifiers, but the reduction in gain requires two-stage amplification and other measures to solve it. However, the traditional two-stage amplifying circuit will cause the deterioration of the frequency characteristics, resulting in the need to add compensation capacitors to stabilize the op amp, which also reduces the bandwidth...

AI Technical Summary

Problems solved by technology

With the development of integrated circuit technology, the continuous reduction of feature size has played a very positive role in expanding the bandwidth of operational amplifiers, but the reduction in gain requires two-stage amplification and other measures to solve the problem.

However, the traditional two-stage amplifier circuit will lead to the deterioration of the frequency characteristics, resulting in the need to add compensation capacitors to stabilize the op amp, which also reduces the bandwidth of the op amp.

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