All-MOS ASK demodulator for low-frequency applications

作者：Lee, Tzung Je^*; Lee, Ching Li; Ciou, Yan Jhih; Huang, Chi Chun; Wang, Chua Chin

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2008, 55(5): 474-478.

DOI：10.1109/TCSII.2007.912687

• amplitude-shift-keying (ASK) demodulator
• envelope detector
• low-frequency ISM band
• noise margin
• wireless network

A miniature amplitude-shift-keying (ASK) demodulator without any passive elements, i.e., R or C, for low-frequency applications is presented in the paper. The noise margin of the envelope detector in the proposed ASK demodulator is enlarged such that any Schmitt trigger or current limiting resistor is no longer needed. It results in the number of transistors required for the ASK demodulator circuit is reduced to 12, while the area is merely 0.003025 mm(2) using 0.35-mu m 2P4M CMOS process. The power consumption is found to be 1.01 mW by physical measurement on silicon. The data rate is measured to be 250 kbps for 2-MHz carrier frequency and 27% modulation index.

• 出版日期2008-5
• 单位中山大学