Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop
A variable-gain chopper-stabilized instrumentation amplifier (chopper IA), which employs a low pass filter (LPF) to attenuate the up-converted noise at the chopping frequency, is presented. The circuit is designed and fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) (Hsinchu, Taiwan...
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2018-06-01
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doaj-f6497658482a45d89af507dfac1c7b122020-11-24T21:17:59ZengMDPI AGMicromachines2072-666X2018-06-019628910.3390/mi9060289mi9060289Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning LoopChen-Mao Wu0Hsiao-Chin Chen1Ming-Yu Yen2San-Ching Yang3Asmedia Technology Inc., New Taipei 231, TaiwanDepartment of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanInventec Corporation, Taipei 11107, TaiwanA variable-gain chopper-stabilized instrumentation amplifier (chopper IA), which employs a low pass filter (LPF) to attenuate the up-converted noise at the chopping frequency, is presented. The circuit is designed and fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) (Hsinchu, Taiwan) 0.18 μm complementary metal-oxide-semiconductor (CMOS) technology. Consuming 1.1 mW from a 1.2 V supply voltage, the chopper IA achieves a variable gain of 20.7–48.5 dB, with a minimum bandwidth of 6.7 kHz and a common-mode rejection ratio (CMRR) of 95 dB below 10 kHz. By using the chopper technique, the input-referred noise of the chopper IA can be reduced to 0.28 μVrms (0~96 kHz), with a chopping frequency of 83.3 kHz. An automatic frequency tuning loop (ATL) is employed to adjust the corner frequency of the LPF dynamically so that the frequency ratio between the chopping frequency and the LPF corner frequency is 8.3, ensuring a noise reduction of 36.7 dB.http://www.mdpi.com/2072-666X/9/6/289automatic frequency tuning loopchopper techniqueinstrumentation amplifierlow-pass filter |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chen-Mao Wu Hsiao-Chin Chen Ming-Yu Yen San-Ching Yang |
spellingShingle |
Chen-Mao Wu Hsiao-Chin Chen Ming-Yu Yen San-Ching Yang Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop Micromachines automatic frequency tuning loop chopper technique instrumentation amplifier low-pass filter |
author_facet |
Chen-Mao Wu Hsiao-Chin Chen Ming-Yu Yen San-Ching Yang |
author_sort |
Chen-Mao Wu |
title |
Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop |
title_short |
Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop |
title_full |
Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop |
title_fullStr |
Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop |
title_full_unstemmed |
Chopper-Stabilized Instrumentation Amplifier with Automatic Frequency Tuning Loop |
title_sort |
chopper-stabilized instrumentation amplifier with automatic frequency tuning loop |
publisher |
MDPI AG |
series |
Micromachines |
issn |
2072-666X |
publishDate |
2018-06-01 |
description |
A variable-gain chopper-stabilized instrumentation amplifier (chopper IA), which employs a low pass filter (LPF) to attenuate the up-converted noise at the chopping frequency, is presented. The circuit is designed and fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) (Hsinchu, Taiwan) 0.18 μm complementary metal-oxide-semiconductor (CMOS) technology. Consuming 1.1 mW from a 1.2 V supply voltage, the chopper IA achieves a variable gain of 20.7–48.5 dB, with a minimum bandwidth of 6.7 kHz and a common-mode rejection ratio (CMRR) of 95 dB below 10 kHz. By using the chopper technique, the input-referred noise of the chopper IA can be reduced to 0.28 μVrms (0~96 kHz), with a chopping frequency of 83.3 kHz. An automatic frequency tuning loop (ATL) is employed to adjust the corner frequency of the LPF dynamically so that the frequency ratio between the chopping frequency and the LPF corner frequency is 8.3, ensuring a noise reduction of 36.7 dB. |
topic |
automatic frequency tuning loop chopper technique instrumentation amplifier low-pass filter |
url |
http://www.mdpi.com/2072-666X/9/6/289 |
work_keys_str_mv |
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1726010913962590208 |