论文信息 - Design of a novel linear 3-input CMOS OTA and its application to filter realization

Design of a novel linear 3-input CMOS OTA and its application to filter realization

A novel voltage-tunable linear 3-input CMOS Operational Transconductance Amplifier (OTA) suitable for on-chip integration of advanced monolithic system is described. When a 3-input OTA is needed, a conventional 3-input OTA uses two 2-input OTAs and grounds one of 4 input terminals. This paper presents a method to reduce the number of MOS transistors and to save chip area by designing a 3-input OTA directly. A CMOS pair technique is introduced as a solution to minimize a matching problem. Simulation results show that the active chip area of the proposed 3-input OTA is reduced by 23.7% compared to a conventional one. The proposed 3-input OTA is applied to a realization of an OTA-C filter to verify the effectiveness.

Nobuo Fujii | Shigetaka Takagi | Moonjae Jeong | Z. Czarnul

[1] Cheng-Chieh Chang,et al. CMOS analog divider and four-quadrant multiplier using pool circuits , 1995 .

[2] Z. Wang,et al. A CMOS four-quadrant analog multiplier with single-ended voltage output and improved temperature performance , 1991 .

[3] S. Szczepanski,et al. Linear transconductor based on crosscoupled CMOS pairs , 1991 .

[4] W. Guggenbuhl,et al. A voltage-controllable linear MOS transconductor using bias offset technique , 1990 .

[5] Jaime E. Kardontchik,et al. Introduction to the design of transconductor-capacitor filters , 1992, The Kluwer international series in engineering and computer science.

[6] E. Seevinck,et al. A versatile CMOS linear transconductor/square-law function , 1987 .

[7] J.S. Pena-Finol,et al. A MOS four-quadrant analog multiplier using the quarter-square technique , 1987 .

[8] Mohammed Ismail. Four-transistor continuous-time MOS transconductor , 1987 .