A Low Power Wideband Fully Differential Operational Amplifier

Abstract

The invention relates to a lower-power-consumption broadband fully differential operational amplifier, and belongs to the field of analogue integrated circuits. An operational amplifier circuit is of a feed-forward zero compensation circuit structure. On the basis of an amplifier of a two-stage structure, a feed-forward path from input to output is additionally introduced, and in this way, a left half-plane zero point is formed on the basis of two poles and performs compensation on the phase to achieve stable operational amplification. Because miller compensation is not adopted for the structure, compared with the miller compensation structure, the position of the main pole is higher, and the lower-power-consumption broadband fully differential operational amplifier is more suitable for lower-power-consumption high bandwidth circuit design. The lower-power-consumption broadband fully differential operational amplifier is simple in structure, needs lower power consumption under the condition of meeting the requirement of achieving broadband application, and can meet the requirements of a wireless broadband communication system well.

Description

technical field

[0001] The invention relates to a wide-band fully differential operational amplifier with low power consumption, especially used in an intermediate frequency circuit of a wide-band wireless communication transceiver, and belongs to the field of analog integrated circuit design. Background technique

[0002] Due to the rapid development of broadband wireless communication, the bandwidth frequency of intermediate frequency circuits such as filters and ADC circuits in transceivers is generally above 10MHz, and some high-speed wireless communication protocols even reach the order of 100MHz, which requires high requirements. It is required that the bandwidth of the operational amplifier used in these circuits should be relatively large. However, the traditional Miller compensation is used to move the output pole to the direction away from the origin, so that the pole between the two stages moves to the origin. If the 3dB bandwidth of the frequency-compensated two...

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