DocumentCode :
1617467
Title :
Low-voltage, low-power and high gain CMOS OTA using active positive feedback with feedforward and FDCM techniques
Author :
Bouzerara, L. ; Belaroussi, M.T. ; Amirouche, B.
Author_Institution :
Microelectron. Lab., Centre de Developpement des Technol. Avancees, Algiers, Algeria
Volume :
2
fYear :
2002
fDate :
6/24/1905 12:00:00 AM
Firstpage :
573
Lastpage :
576
Abstract :
A low voltage, high dc gain and wideband load compensated cascode operational transconductance amplifier (OTA), using an active positive feedback with feedforward technique and frequency-dependent current mirrors (FDCM), is presented and analyzed. Such techniques stand as a powerful method of gain, bandwidth and phase margin enhancements. In this paper, a frequency-dependent current mirror, whose input impedance increases with frequency, is used to form the feedforward path at the input of the current mirror with a feedforward capacitor. By using these techniques, the unity-gain frequency of the amplifier is improved from 115 MHz to 182 MHz, the phase margin is also improved from 80° to 95° and the gain is enhanced from 11 dB to 90 dB. This amplifier operates at 2.5 V power supply voltage, drives a capacitive load of 1 pF and gives a power dissipation of 7 mW. All the simulation results are obtained using HSPICE tool with 0.8 μm CMOS AMS parameters
Keywords :
CMOS analogue integrated circuits; SPICE; circuit simulation; current mirrors; feedback amplifiers; feedforward; low-power electronics; operational amplifiers; wideband amplifiers; 0.8 micron; 1 pF; 182 MHz; 2.5 V; 7 mW; 90 dB; CMOS AMS parameters; CMOS OTA; FDCM techniques; HSPICE tool; active positive feedback; bandwidth enhancements; capacitive load; cascode operational transconductance amplifier; feedforward path; feedforward techniques; frequency-dependent current mirrors; gain enhancements; high gain amplifier; low-power amplifier; phase margin enhancements; power dissipation; power supply voltage; unity-gain frequency; Bandwidth; Broadband amplifiers; Capacitors; Feedback; Frequency; Impedance; Low voltage; Mirrors; Operational amplifiers; Transconductance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microelectronics, 2002. MIEL 2002. 23rd International Conference on
Conference_Location :
Nis
Print_ISBN :
0-7803-7235-2
Type :
conf
DOI :
10.1109/MIEL.2002.1003322
Filename :
1003322
Link To Document :
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