Comparison Of Three CMOS Amplifiers Used in Communication

Abstract

With the rapid development of wireless communication technology, the low power consumption, low cost, and high efficiency of wireless communication equipment have become the development trend. Because of the increasing problems caused by power consumption, to meet the needs of people and the market, people should first understand the principle of low-power amplifiers and scientific research results to get inspiration. This paper summarizes the advantages and disadvantages of three kinds of amplifiers and draws some conclusions to better understand the low-power amplifier. Ultra-low power low noise amplifier circuit with high gain and low voltage operating at 5.2GHz. The folded cascade structure and forward substrate bias technology are used to reduce the operating voltage of LNA, and the input impedance matching of the first amplifier is achieved by the source inductance negative feedback technology. The second stage amplifier introduces the transformer negative feedback Transconductance enhancement technique. The second amplifier is 5.8GHz CMOS power amplifier. A computer-aided method for calculating device values in an RC feedback network is used to improve the stability of a power amplifier. The single-ended power amplifier is designed by using Shanghai 0.18μm CMOS technology. The lase one is ultra-low noise, high linear ultra-wideband low noise amplifier circuit operating at 3.1-10.6GHz. It mainly consists of two stages: the first stage is the input matching stage, which adopts the common gate structure to realize the broadband input matching; The second stage is an amplifier stage, which is composed of an improved common source common gate structure.