Title :
A feedforward compensation scheme for high gain wideband amplifiers
Author :
S, Bharath Kumar Thandri ; Silva-Martinez, Jose ; Maloberti, Franco
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
A No-Capacitor FeedForward (NCFF) compensation which uses pole-zero cancellation to obtain high gain, high GBW and a good phase margin is proposed. Left half plane (LHP) zeros produced due to the feedforward path cause a +90° shift in the phase and are used to cancel the -90° shifts in the phase caused by the poles. A fully differential OTA using the NCFF compensation scheme has been designed using AMI 0.5 μm technology; DC gain of 97 dB, GBW of 325 MHz, settling time of 5 ns and phase margin of around 90° are achieved
Keywords :
CMOS analogue integrated circuits; compensation; differential amplifiers; feedforward; operational amplifiers; poles and zeros; step response; wideband amplifiers; 0.5 micron; 5 ns; 97 dB; AMI technology; differential OTA; feedforward compensation scheme; high gain wideband amplifiers; no-capacitor feedforward compensation; phase margin; pole-zero cancellation; Ambient intelligence; Application specific integrated circuits; Bandwidth; Broadband amplifiers; Capacitors; Degradation; Frequency; Gain; Poles and zeros; Robustness;
Conference_Titel :
Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on
Print_ISBN :
0-7803-7057-0
DOI :
10.1109/ICECS.2001.957411
