Title :
A low-power CMOS RF power detector
Author :
Sakphrom, S. ; Thanachayanont, Apinunt
Author_Institution :
Fac. of Eng., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
This paper describes the design and implementation of a low-power wide dynamic range radio-frequency (RF) power detector in a standard 0.18-μm CMOS process. The proposed circuit includes a root-mean-square (RMS) power detector and a logarithmic amplifier. The RMS power detector exploits the nonlinear characteristic of MOSFET to realize the RMS conversion. A current-mirror active load is used in the RMS power detector to increase the RMS conversion gain. Since the output of the RMS power detector is a DC voltage, the following logarithmic amplifier does not require wide operating bandwidth, thus allowing simple circuit realization with minimum power dissipation. Simple differential amplifier is used to realize the limiting gain stage. Post-layout simulation results showed that the proposed circuit was able to detect input power from -70 dBm to -20 dBm with signal frequencies ranging from 0.5 GHz to 5 GHz, while dissipating only 0.9 mW under a 1.8-V power supply voltage.
Keywords :
CMOS integrated circuits; MOSFET circuits; amplifiers; low-power electronics; mean square error methods; radio equipment; MOSFET; RMS power detector; logarithmic amplifier; low-power CMOS RF power detector; low-power wide dynamic range radio-frequency power detector; root mean square power detector; CMOS integrated circuits; Detectors; Dynamic range; Limiting; MOSFET circuits; Power dissipation; Radio frequency; Limiting amplifier; Logarithmic amplifier; Low-power; RF power detector; RMS power detector;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2012 19th IEEE International Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4673-1261-5
Electronic_ISBN :
978-1-4673-1259-2
DOI :
10.1109/ICECS.2012.6463771
