All-MOS ASK Demodulator for Low-Frequency Applications

Author

Lee, Tzung-Je ; Lee, Ching-Li ; Ciou, Yan-Jhih ; Huang, Chi-Chun ; Wang, Chua-Chin

Author_Institution

Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung

Volume

55

Issue

5

fYear

2008

fDate

5/1/2008 12:00:00 AM

Firstpage

474

Lastpage

478

Abstract

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 mm² using 0.35-mum 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.

Keywords

CMOS integrated circuits; MOSFET; amplitude shift keying; demodulators; low-pass filters; CMOS process; all-MOS ASK demodulator; amplitude-shift-keying; envelope detector; frequency 2 MHz; noise margin; power consumption; size 0.35 mum; transistor circuit; Amplitude-shift–keying (ASK) demodulator; envelope detector; low-frequency ISM band; noise margin; wireless network;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2007.912687

Filename

4420095