0.9 V low-power switched-opamp switched-capacitor bandpass filter for electroneurography acquisition systems

Lee, Shyh-Chyang; Lee, Shuenn-Yuh; Chiang, Chih-He

doi:10.1049/iet-cds:20070163

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…A VGA in the electrocardiogram system exploit an SC integrating circuit to vary the gain by tuning the phase delay between two clocks, which requires a relatively long period for a large tuning range [10]. Switched‐opamp‐based SC‐VGA can further lower the power consumption [11], but the speed is limited.…”

Section: Introductionmentioning

confidence: 99%

Low noise, −50 dB second harmonic distortion single‐ended to differential switched‐capacitive variable gain amplifier for ultrasound imaging

Wang

Ytterdal

2016

IET Circuits, Devices & Systems

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A low noise, low power, single-ended to differential switched-capacitor variable gain amplifier (SC-VGA) is designed and fabricated in 0.18 µm complementary metal-oxide-semiconductor technology for a 2-6 MHz second harmonic cardiac ultrasound imaging system. The SC-VGA has 10-bit dB-linear gain steps from −14 to 32 dB which are distributed into two stages, and each stage has a single-stage operational trans-conductance amplifier using floating capacitors to save the power and improve the noise performance. The first stage converts the single-ended input to differential outputs with the 2-bit gain control from 0 to 18 dB, and the second stage exploits 8-bit capacitor arrays to control the gain from −14 to 14 dB. The measured results show that the second harmonic distortion is <−50 dB, the third harmonic distortion is <−50 dB and the integrated noise from 2 to 6 MHz at the output is −64 dBm at the maximum gain and a sampling frequency of 30 MHz. The simulation results match well with the measured results. The SC-VGA works at a supply voltage of 1.6 V and consumes the current of 900 µA. The die size of the SC-VGA is 387 µm × 502 µm.

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Section: Introductionmentioning

confidence: 99%