| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 105 === People pay attention to the health of the body more and more, various bio-medical wearable devices have been launched to measure the physiological signals through the medical electronic equipment for ensuring the health of physical. Recent years, by improving the multi-purpose biomedical instruments, reliability, power consumption, equipment size and cost are essential to today's circuit design. Particularly, how to reduce the power consumption and low noise is important to achieve the portability.
This thesis consists of two parts, the first part designs a low noise amplifier for bio-medical application using partial current input pair, and it can reduce the size of elements, and it followed by programmable gain amplifier to be used for different physiological signals. In the second part, designs a low noise amplifier for bio-medical application using current-reusing technique that is used to maintain flicker noise and thermal noise to lower level and to keep low power consumption. And it followed by programmable gain amplifier to be used for different physiological signals.
Designs in this thesis are fabricated in the UMC 0.18 μm 1P6M CMOS process. In order to pursue low-power consumption, the supply voltage is all set up as low as 1.2 V. The first circuit is an LNA. When the input signal is 100 μV input amplitude with 100 Hz, the mid-band gain of analog front-end low-noise amplifier can be programmed from 42 dB to 69 dB. The post layout simulation shows that the input-referred noise is 4.1065 μVrms, the chip area is 0.82mm*0.95mm, and the overall chip consumes 11.67 μW. The second circuit is also an LNA. When input signal is 100 μV input amplitude with 100 Hz, the mid-band gain of analog front-end low-noise amplifier can be programmed from 45 dB to 55 dB. The post layout simulation shows that the input-referred noise is 1.981 μVrms, the chip area is 0.72mm*0.95mm, and the overall chip consumes 6.58 μW.
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