scholarly journals A Demodulation Circuit For Analog Front End Of Passive Tag Chip

2021 ◽  
Vol 2065 (1) ◽  
pp. 012007
Author(s):  
Qinglong Li ◽  
Yong Xu ◽  
Qiao Li ◽  
Kun Peng ◽  
Xian Zhang
Keyword(s):  
Noise Suppression ◽  
Modulation Depth ◽  
Signal Frequency ◽  
Cmos Process ◽  
Uhf Rfid ◽  
Passive Uhf Rfid ◽  
Average Value ◽  
Front End ◽  
Analog Front End ◽  
Detection Circuit

Abstract The demodulation circuit designed in this paper is suitable for the analog front end of passive UHF RFID tag chip, which can handle ASK signals with large changes in amplitude, modulation depth and signal frequency. Its performance meets the requirements of standards ISO/IEC 18000-6C and GB/T 29768-2013. Envelope detection circuit and limiter circuit are simple in structure and do not consume power. The comparison reference voltage is taken according to the average value of the envelope high and low levels, and is less affected by the dynamic changes of the input signal. Changing the width-to-length ratio of the MOSFETs in the feedback path of the comparator can adjust the hysteresis, with strong noise suppression and controllable sensitivity. The demodulator is implemented with TSMC 0.18 μm standard CMOS process. The simulation results show that the ASK signal modulation depth that the demodulator can handle is as low as 30%, and the maximum pulse width demodulation error is only 0.43%.

A low-power analog front end of passive UHF RFID tag IC for EPC™ C1G2

2009 ◽  
Author(s):  
Shaojie Zhang ◽  
Lingling Sun ◽  
Hui Hong ◽  
Jun Liu ◽  
Jian Han ◽  
...  
Keyword(s):  
Low Power ◽  
Uhf Rfid ◽  
Rfid Tag ◽  
Passive Uhf Rfid ◽  
Front End ◽  
Analog Front End ◽  
Tag Ic

Design of analog front end of passive UHF RFID tag

2011 ◽  
Author(s):  
Zejun Wu ◽  
Jinfeng Huang ◽  
Jinpeng Shen ◽  
Xiaoxing Feng ◽  
Xin'an Wang
Keyword(s):  
Uhf Rfid ◽  
Rfid Tag ◽  
Passive Uhf Rfid ◽  
Front End ◽  
Analog Front End

scholarly journals 14.85 µW Analog Front-End for Photoplethysmography Acquisition with 142-dBΩ Gain and 64.2-pArms Noise

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 512
Author(s):  
Binghui Lin ◽  
Mohamed Atef ◽  
Guoxing Wang
Keyword(s):  
Dynamic Range ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Low Noise ◽  
Total Power ◽  
Cmos Process ◽  
Control Block ◽  
Silicon Area ◽  
Front End ◽  
Analog Front End

A low-power, high-gain, and low-noise analog front-end (AFE) for wearable photoplethysmography (PPG) acquisition systems is designed and fabricated in a 0.35 μm CMOS process. A high transimpedance gain of 142 dBΩ and a low input-referred noise of only 64.2 pArms was achieved. A Sub-Hz filter was integrated using a pseudo resistor, resulting in a small silicon area. To mitigate the saturation problem caused by background light (BGL), a BGL cancellation loop and a new simple automatic gain control block are used to enhance the dynamic range and improve the linearity of the AFE. The measurement results show that a DC photocurrent component up-to-10 μA can be rejected and the PPG output swing can reach 1.42 Vpp at THD < 1%. The chip consumes a total power of 14.85 μW using a single 3.3-V power supply. In this work, the small area and efficiently integrated blocks were used to implement the PPG AFE and the silicon area is minimized to 0.8 mm × 0.8 mm.

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