Operational Transconductance Amplifier And Its Filter Principles And Applications

The design of analog integrated circuit derives itself from the development ofVLSI technique and the urgeDt requirement of eleCtrOnic system integration. Since lowvoltnge, low power CMOS analogy circuit and current-mode analogy integrated circuithave so many advaotages, it has become moSt appealing for VLSI t6chnique theoroticalscholar and design engineeL Filter is an imPortant unit of analog integrated circuit,whose StruCtUe construCtion and design method can estend to the design of large scale' ana1og integrated circuit.'The paPer stUdies the theorotics and synthesizat8tion of OperationalTransconduCtance AJnplifier (OTA and OTA-C filter circuits, narrates the present Stateof the research of analogy integrated circuit at home and abroad. The model of CMOStransiStor and the basic circuit units based CMOS transistors such as current mirrors areshown. With the essential exploration of the usual OTA. twO imProved design methodsare introduced. The simulative circuits of aCtive network elemellts and analog signaloperation based on OTA are induced Systematically. Some methods to design-second-order and high-order OTA-C filters are analyzed detai1edly Accordingly,several circuit instances are proposed and simulated with the PSpice prograrns, and thesimulated results are satisfying. A novel-low voltage and lowpower OTA and auniversal biquadratic filter based on OTAs and a multiple outPut second generationcurreflt conveyor are presellted.