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IET Circuits, Devices & Systems | Vol.10, Issue.3 | | Pages 173-180
Low noise, −50 dB second harmonic distortion single-ended to differential switched-capacitive variable gain amplifier for ultrasound imaging
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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Low noise, −50 dB second harmonic distortion single-ended to differential switched-capacitive variable gain amplifier for ultrasound imaging
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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power singleended to differential switchedcapacitor variable gain amplifier scvga 10bit dblinear gain steps 8bit capacitor arrays 2bit gain control singlestage operational transconductance amplifier integrated noise mhz second harmonic cardiac ultrasound imaging floating capacitors differential outputs complementary metaloxidesemiconductor technology singleended input harmonic distortion
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