Title :
A CMOS linear tunable transconductor for continuous-time tunable Gm-C filters
Author :
Sanchez-Rodriguez, Trinidad ; Lujan-Martinez, C.I. ; Carvajal, R.G. ; Ramirez-Angulo, Jaime ; Lopez-Martin, Antonio
Author_Institution :
Escuela Super. de Ing., Univ. de Sevilla, Sevilla
Abstract :
A novel CMOS linear transconductor is presented. It is basically an improvement of the classical telescopic cascode OTA with source degeneration in which the resistor has been implemented using quasi-floating-gates transistors. It also allows compact implementation of common mode voltage control circuitry in order to save area and power consumption. This transconductor has been designed in a 0.5 mum CMOS technology and the results obtained show a THD of -61 dB at 10 Mhz for a 1 Vpp output voltage. In order to show the feasibility for the implementation of tunable Gm-C filters using the proposed transconductor, a 1 MHz tunable third order Chebyshev low-pass filter suitable for Bluetooth applications has been experimentally validated.
Keywords :
Bluetooth; CMOS integrated circuits; Chebyshev filters; low-pass filters; transistors; voltage control; Bluetooth applications; CMOS linear tunable transconductor; Chebyshev low-pass filter; classical telescopic cascode OTA; common mode voltage control circuitry; continuous time tunable Gm-C filters; frequency 1 MHz; frequency 10 MHz; power consumption; quasi-floating gates transistors; size 0.5 mum; source degeneration; CMOS technology; Chebyshev approximation; Energy consumption; Low pass filters; Nonlinear filters; Resistors; Space technology; Transconductors; Tunable circuits and devices; Voltage control;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541567
