Title :
Design considerations for a high performance OTA with fully differential gain enhancement
Author :
Miao, Guoqing ; Tang, Pushan
Author_Institution :
Dept. of Electron. Eng., Fudan Univ., Shanghai, China
Abstract :
A small-signal analysis of the basic active cascode gain-enhancement circuit is presented. The analysis results in a three-pole one-zero representation. It shows that although OTA´s DC gain is boosted, its frequency response becomes worse because of two factors: a doublet and the lower nondominant pole. An effective compensation method is then introduced to reduce this effect. Based on the above results, the design of a high-performance OTA is presented which uses a fully differential gain-enhancement technique. This improves the settling behavior and reduces power and area
Keywords :
CMOS analogue integrated circuits; compensation; differential amplifiers; frequency response; linear network analysis; linear network synthesis; operational amplifiers; poles and zeros; DC gain; active cascode gain-enhancement circuit; compensation method; doublet; frequency response; fully differential gain enhancement; high performance OTA; nondominant pole; operational transconductance amplifier; settling behavior; small-signal analysis; three-pole one-zero representation; Analog integrated circuits; Capacitors; Degradation; Differential amplifiers; Energy consumption; Equations; Equivalent circuits; Frequency; Parasitic capacitance; Performance gain;
Conference_Titel :
Solid-State and Integrated Circuit Technology, 1995 4th International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-3062-5
DOI :
10.1109/ICSICT.1995.499647
