Low-power consumption bandwidth multiplication chopping stabilized operational amplifier based on MOS (metal oxide semiconductor) device

Abstract

The invention discloses a low-power consumption bandwidth multiplication chopping stabilized operational amplifier based on an MOS (metal oxide semiconductor) device, which belongs to the field of design of analog integrated circuits. The low-power consumption bandwidth multiplication chopping stabilized operational amplifier comprises two frequency mixers, a shunt input stage, an intermediate stage for amplifying recovered current and a rail-to-rail output stage, wherein one frequency mixer is placed in front of an amplifier input stage, and the other frequency mixer is placed behind an amplifier output stage, thereby realizing the functions of raising frequency and reducing frequency of input signals; the shunt input stage is used for converting input voltage signals to current signals and forming small signal current in forward and backward directions; the intermediate stage for amplifying the recovered current comprises four low-voltage current mirrors and can realize the amplification of the recovered current; and the rail-to-rail output stage is used for realizing the rail-to-rail output of the signals. The low-power consumption bandwidth multiplication chopping stabilized operational amplifier has the capacity of improving bandwidth by nearly three times under the situation of not obviously increasing power consumption, and can reduce low-frequency 1 / f noise, increase low-frequency gain, and reduce power consumption above one half while keeping the same bandwidth, the noise and other performances, thereby further improving the performances of the circuit.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to a MOS device-based low-power bandwidth multiplication chopper-stabilized operational amplifier. Background technique: [0002] Since the 20th century, with the development of submicron and ultra-deep submicron technology and the increasing maturity of system chip technology, portable electronic products powered by batteries have achieved rapid development and rapid popularization. Since the development of battery technology is far behind the development of electronic systems, products ranging from heart pacemakers to hearing aids, mobile phones and various products have imposed strict restrictions on the supply voltage of electronic products. On the other hand, as the size of the device continues to shrink, the breakdown voltage of the process is also reduced, which also imposes strict restrictions on the power supply voltage. The performance requirements of elect...

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Problems solved by technology

[0006] 1. Compared with other types of amplifiers, its static power consumption is high

[0007] 2. The current sources N1 and N2 are only used as current sources and are not used to transmit small signal currents, which is a kind of "waste".

[0008] 3. In the case of strict power consumption requirements, it is difficult to achieve high bandwidth performance

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