Transconductance enhancement mode low voltage transconductance amplifier realized based on complementary metal oxide semiconductor (CMOS) device

Abstract

The invention discloses a transconductance enhancement mode low voltage transconductance amplifier realized based on a complementary metal oxide semiconductor (CMOS) device, belonging to the field of design of analog integrated circuits. The amplifier comprises a differential input pair comprising a group of P-channel metal oxide semiconductor (PMOS) pipe and used for converting an input voltage signal into a current signal, a positive feedback diode comprising a group of N-channel metal oxide semiconductor (NMOS) pipe and used for enhancing transconductance through positive feedback, two groups of high-speed current mirrors used for copying an enhanced small signal current, and an output stage comprising NMOS and PMOS pipes and used for providing an output impedance and driving capability. The transconductance enhancement mode low voltage transconductance amplifier has the capability of working at low voltage, can increase the bandwidth by about at least two times compared with an original amplifier, and can save half power consumption, and low frequency gain also has a corresponding enhancement effect. The transconductance enhancement mode low voltage transconductance amplifier realized based on the CMOS device has a good practical prospect, and can be applied to multiple circuit modules, such as signal amplification circuits, AD / DA circuits and so on.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to a transconductance enhanced low-voltage transconductance amplifier based on CMOS devices. Background technique [0002] In recent years, mobile handheld electronic devices have developed rapidly, such as mobile phones, tablet computers, smart wearable devices, etc. People hope that these electronic devices have excellent performance and long-lasting battery life to meet more and more demanding application requirements. In most electronic devices, the integrated circuit chip is a major power-consuming module. Therefore, in chip design, low-power design technology is becoming more and more important, and low-power chips have always been the research focus of academia and industry. [0003] In the field of analog integrated circuit design, the amplifier is a very important circuit module. Most of the analog circuits need to use the amplifier, and the amplifier is als...

AI Technical Summary

Problems solved by technology

However, this circuit has the disadvantages of insufficient transconductance and limited output impedance:

[0007] 1. The transconductance generated by a single tube is small, which cannot meet the requirements of large bandwidth;

[0008] 2. The output impedance is small, resulting in low amplifier gain, and it is difficult to exceed 40dB under advanced technology;

[0009] 3. Low current utilization efficiency and high power consumption

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