中圖分類號：TN722 文獻(xiàn)標(biāo)志碼：A DOI: 10.16157/j.issn.0258-7998.256550
中文引用格式： 顧美慶，黃偉，曹華. 低溫度與工藝增益誤差的可變增益放大器設(shè)計[J]. 電子技術(shù)應(yīng)用，2025，51(10)：47-51.
英文引用格式： Gu Meiqing，Huang Wei，Cao Hua. A variable gain amplifier designed with low gain variation at temperature and process[J]. Application of Electronic Technique，2025，51(10)：47-51.

A variable gain amplifier designed with low gain variation at temperature and process

Abstract： A pre-variable gain amplifier for high precision temperature measuring system is designed in 0.18 μm process, compared with the traditional preamplifier, and the influence of the feedback network leakage on the front-end sampling circuit is avoided by using the opening loop structure. Through the current source of the power voltage, the current is provided for the cross-guide amplifier circuit, which produces a transconductance that does not contain the process parameters, and then the gain unrelated to voltage supply, temperature, and process parameters is obtained by the operation amplifier. By changing the load of the whole difference cross-amplifier amplifier, 10 and 40 times variable gain are implemented. The simulation results show that when the amplification gain is 10 times, the maximum gain variation with temperature is 0.19 dB, the maximum gain variation with voltage supply is 0.15 dB, the maximum gain variation with process is 0.12 dB. When the amplification gain is 40 times, the maximum gain variation with temperature is 0.16 dB, the maximum gain variation with voltage supply is 0.23 dB, the maximum gain variation with process is 0.13 dB.

Key words : variable gain amplifier；co-source common grid current source；transconductance amplifier；co-source common grid amplifier；low temperature gain error；low process gain error