Title :
Precise RSSI with High Process Variation Tolerance
Author :
Yang, Chao ; Mason, Andrew
Author_Institution :
Electr. & Comput. Eng., Michigan State Univ., East Lansing, MI
Abstract :
A receiving signal strength indicator (RSSI) built with transconductance amplifiers is presented. The RSSI achieves high tolerance to process variations by utilizing the unique nature of branch currents in a transconductance amplifier. These branch currents are used to implement a current-mode rectifier and amplitude clipping circuit that are tolerant of process variations. An on-chip offset control loop permits the entire RSSI to be realized with only one external component. In 0.18 mum CMOS with a 1.8V supply, the RSSI draws 2.5mA and provides 80dB of offset suppression and more than 70dB of log-linear range with less than +/-2dB error due to process variation.
Keywords :
CMOS integrated circuits; current-mode circuits; operational amplifiers; radio receivers; rectifiers; 0.18 micron; 1.8 V; 2.5 mA; amplitude clipping circuit; branch currents; current-mode rectifier; on-chip offset control loop; process variation tolerance; receiving signal strength indicator; transconductance amplifiers; Bandwidth; Calibration; Chaos; Circuits; MOSFETs; Rectifiers; Signal processing; Transconductance; Transfer functions; Voltage;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.378771
