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| Content Provider | IET Digital Library |
|---|---|
| Author | Wang, Peng Halvorsrød, Thomas M. Ytterdal, Trond |
| Abstract | This Letter presents a 12b-control ultra-low-power low-noise two-stage single-ended to differential switched-capacitor variable gain amplifier (SC-VGA) for 2–6-MHz second harmonic cardiac imaging ultrasound probes in 0.18 μm complementary metal oxide semiconductor. The proposed SC-VGA consists of inverters and capacitor (CAP) arrays. By adopting inverters instead of operational trans-conductance amplifiers (OTAs) in traditional SC-amplifiers, both the power and noise are significantly improved. Each stage has a 6b binary-weighted CAP array, and in total the 12b CAP arrays achieve the dB-in-linear gain range from − 21 to 21 dB. The CAP array is divided between the upper 3b and lower 3b by a CAP to decrease the capacitance spread. The total power consumption is 150 μA at 1 V supply voltage, and the input referred noise is 6.5 nV/√HZ at 4 MHz. The second harmonic distortion (HD2) has the mean value − 77 dB at the 460 mV peak-to-peak output swing for 50 samples of Monte Carlo mismatch simulation with a 30 MHz sampling frequency. |
| Starting Page | 55 |
| Ending Page | 57 |
| Page Count | 3 |
| Volume Number | 2013 |
| e-ISSN | 20513305 |
| Issue Number | Issue 10, Oct (2013) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/2013/10 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2013.0088 |
| Journal | The Journal of Engineering |
| Publisher | The Institution of Engineering and Technology |
| Publisher Date | 2013-09-30 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution-Non Commercial-No Derivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/) |
| Subject Keyword | Amplifiers Binary-weighted CAP Array Biomedical Ultrasonics Capacitance Capacitor Capacitor Array CMOS Analogue Integrated Circuit CMOS Integrated Circuit Complementary Metal Oxide Semiconductor Differential Amplifiers Frequency 2 MHz to 6 MHz Gain -21 DB to 21 DB Harmonic Cardiac Imaging Ultrasound Probes HD2 Inverter Invertors Low Noise Amplifier Low Power Electronics Medical Ultrasound Probes Monte Carlo Method Monte Carlo Mismatch Simulation Patient Diagnostic Method And Instrumentation Power Consumption Power Electronics Power Supply Probability Theory Sampling Frequency SC-amplifiers Second Harmonic Distortion Sonic And Ultrasonic Application Sonic And Ultrasonic Radiation Statistics Stochastic Linearised SCUC Supervisory Circuit Switched Capacitor Integrator Time Varying And Switched Network Ultralow-power Low-noise SC-VGA Ultralow-power Low-noise Two-stage Single-ended-to-differential Switched-capacitor Variable Gain Amplifier Voltage 1 V |
| Content Type | Text |
| Resource Type | Article |
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