Abstract
This paper presents a low-pass filter (LPF) for an ultra-high frequency (UHF) radio frequency identification (RFID) reader transmitter in standard SMIC 0.18 μm CMOS technology. The active-RC topology and Butterworth approximation function are employed mainly for high linearity and high flatness respectively. Two cascaded fully-differential Tow-Thomas biquads are chosen for low sensitivity to process errors and strong resistance to the imperfection of the involved two-stage fully-differential operational amplifiers. Besides, the LPF is programmable in order to adapt to the multiple data rate standards. Measurement results show that the LPF has the programmable bandwidths of 605/870/1020/1330/1530/2150 kHz, the optimum input 1dB compression point of −7.81 dBm, and the attenuation of 50 dB at 10 times cutoff frequency, with the overall power consumption of 12.6 mW from a single supply voltage of 1.8 V. The silicon area of the LPF core is 0.17 mm2.
Highlights
The ultra-high frequency (UHF) radio frequency identification (RFID) technology has been widely applied in many fields because of its advantages such as wide readable range, large information storage capacity, long recognition distance, and strong space penetration [1,2,3]
Butterworth low-pass filter (LPF) for UHF RFID reader transmitter is presented in SMIC 0.18fourth-order μm CMOS technology
Design Butterworth LPF is presented for a UHF RFID reader transmitter, which has many
Summary
The ultra-high frequency (UHF) radio frequency identification (RFID) technology has been widely applied in many fields because of its advantages such as wide readable range, large information storage capacity, long recognition distance, and strong space penetration [1,2,3]. The closed-loop Active-RC continuous-time LPF is chosen over its open-loop Gm-C counterpart, because of its high linearity and large dynamic range [5,6,7,8]. It is widely used for small signal processing, such as suppressing interference, noise, unwanted frequency signal attenuation and highlighting useful frequencies, to improve signal-to-noise ratio [9] and frequency selection [10]. LPFs. Butterworth LPF for UHF RFID reader transmitter is presented in SMIC 0.18fourth-order μm CMOS technology. 2, and the measurement results are given in the work is presented in SMIC 0.18 μm CMOS technology.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call