Automatic Frequency Tuning Loops for Global System for Mobile Communications and Instrumentation Amplifier

• Main Authors: Chen-Mao - Wu, 吳承懋
• Other Authors: Hsiao-Chin Chen
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/26gdk3

碩士 === 國立臺灣科技大學 === 電機工程系 === 105 === Two automatic frequency tuning loops (ATL) are mentioned in the thesis. One is for channel select filters of GSM transceivers, and the other is for a chopper instrumentation amplifier (IA). The ATL for channel select filters of GSM transceivers is based on the master-slave structure. The power consumption is 6.3 mW from a 1.8-V power supply. By controlling a 4 bit cap-array, the corner frequency can be varied from 186 kHz to 322 kHz with the frequency step of 7~12 kHz. The chip area is 1.475 mm 2. The other chip is a tunable gain chopper instrumentation amplifier which employs a Sallen-Key filter to attenuate the up-converted noise at chopper frequency. The ATL for the IA is based on direct-tuning structure, where the filter is connected with the tuning circuit, than that is connected with the signal path. The power consumption is 1.1 mW from a 1.2-V power supply. The gain of the IA is from 20.7 to 48.5 dB with the minimum bandwidth of 7.5 kHz. The chopper IA can achieve up to 95 dB of common mode rejection ratio (CMRR) and power supply rejection ratio (PSRR). By using chopper technique, the input referred noise of the chopper IA can be reduced to 0.33 uVrms (0~96 kHz). By controlling a 3 bit cap-array, the corner frequency can be varied from 7.5 kHz to 14.4 kHz with the frequency step of 0.8~1.1 kHz. The chip area is 2.128 mm 2. The circuits are designed and implemented with TSMC CMOS 0.18-μm process.