Signal Conditioning Circuit Design for Micro Gas Chromatograph
Micro gas chromatograph (Micro GC) converts the content of separated gas to the electronic signal with two thermo conductive detector (TCD), one is for the reference gas, and another is for the sample gas. The signal conditioning circuit directly determines the performance of Micro GC. In this paper, we designed a signal conditioning circuit to restrain the high common voltage of 10V and keep a very low noise after a detailed theoretical calculation, then converts the signal to digital signal with a 24-bit sigma-delta ADC from 77. After applied the new designed circuit, Micro GC has a very good performance so that its linear dynamic range is more than ID6. Additionally, the new signal conditional circuit solves the over-heat problem existed in older conditional circui in Micro GC.
gas chromatograph1 TCD2 low noise3 differential amplifier4 sigma-delta ADC5
Liu Hongfei Lin Chaoli Chen Zhong
Department of Physics, University of Xiamen, Xiamen, 361005, China
国际会议
重庆
英文
1049-1052
2009-12-25（万方平台首次上网日期，不代表论文的发表时间）