期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 44, 期 12, 页码 3232-3243出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2009.2032710
关键词
Chopping; continuous-time; current-feedback; noise efficiency factor (NEF); noise folding; offset; 1/f noise; ripple reduction; thermistor
This paper presents a chopper instrumentation amplifier for interfacing precision thermistor bridges. For high CMRR and DC gain, the amplifier employs a three-stage current-feedback topology with nested-Miller compensation. By chopping both the input and intermediate stages of the amplifier, a 1 mHz 1/f noise corner was achieved at an input-referred noise power spectral density (PSD) of 15 nV/root Hz. To reduce chopper ripple, the amplifier employs a continuous-time AC-coupled ripple reduction loop. Due to its continuous-time nature, the loop causes no noise folding to DC and hence offers improved noise performance over auto-zeroed amplifiers. The loop reduces chopper ripple by more than 60 dB, to levels below the amplifier's own input-referred noise. Furthermore, a maximum input referred offset of 5 mu V and a CMRR greater than 120 dB were measured at a supply current of 230 mu A at 5 V.
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