Title :
Low-voltage CMOS wideband operational transconductance amplifier with regulated cascode circuit
Author :
Bouzerara, L. ; Belaroussi, M.T.
Author_Institution :
Microelectron. Lab., Centre de Developpement des Technol. Avancees, Algiers, Algeria
Abstract :
A low voltage CMOS wideband operational transconductance amplifier (OTA), using regulated cascode structure with an active positive feedback, frequency-dependent current mirrors and feedforward techniques, is presented and analyzed. Such techniques stand as a powerful method of gain, bandwidth, output impedance and phase margin enhancements. In this paper, an efficient implementation of a high output impedance current mirror is used in the design of an OTA by means of the regulated cascode circuits. This amplifier operates at ±1.25 V power supply voltage, exhibits a voltage gain of 68 dB, and provides a gain bandwidth product of 166 MHz. It drives a capacitive load of 1.6 pF and gives a power dissipation of 8.5 mW. The predicted performance is verified by simulations using HSPICE tool with 0.35 μm CMOS TSMC parameters.
Keywords :
CMOS analogue integrated circuits; SPICE; circuit simulation; current mirrors; feedback amplifiers; feedforward; low-power electronics; operational amplifiers; wideband amplifiers; -1.25 to 1.25 V; 0.35 micron; 1.6 pF; 68 dB; 8.5 mW; CMOS; HSPICE; OTA; active positive feedback; bandwidth enhancement; capacitive load; feedforward techniques; frequency-dependent current mirrors; gain bandwidth product; gain enhancement; low voltage amplifier; output impedance; phase margin enhancement; power dissipation; regulated cascode circuit; voltage gain; wideband operational transconductance amplifier; Bandwidth; Broadband amplifiers; Circuits; Feedback; Frequency; Impedance; Low voltage; Mirrors; Operational amplifiers; Transconductance;
Conference_Titel :
Electronics, Circuits and Systems, 2002. 9th International Conference on
Print_ISBN :
0-7803-7596-3
DOI :
10.1109/ICECS.2002.1045330
