A 1 V front-end interface for switched-op amp circuits

Author

Karthikeyan, S. ; Tammineedi, A. ; Boecker, C. ; Lee, Edward K F

Author_Institution

Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA

Volume

2

fYear

1999

fDate

36342

Firstpage

53

Abstract

The switched op amp approach provides an effective solution for low voltage circuit design without the need for voltage multiplication or low V_T MOSFETs. The only problem with this approach is the difficulty in the design of the front-end interfaces without affecting the signal swings. A new front-end interface has been designed and implemented in a conventional 1.2 μ CMOS process with V_TP≈0.8 V and V_TN≈0.6 V. The scheme provides almost rail-to-rail input as well as output swing and hence improves the signal to noise ratio. The circuit was designed to drive a load of 20 pF. Experimental results show that the bandwidth of the amplifier is around 10 MHz and the power consumption is around 80 μWatts, for a 1 V power supply. For a 600 mV input swing, the track mode THD is found to be around -77 dB for f_in=100 kHz, and the signal feedthrough is around -50 dB

Keywords

CMOS analogue integrated circuits; active networks; analogue processing circuits; harmonic distortion; low-power electronics; switched networks; 0.6 V; 0.8 V; 1 V; 1.2 micron; 10 MHz; 80 muW; CMOS process; front-end interface; low voltage circuit design; power consumption; rail-to-rail input swing; signal feedthrough; signal to noise ratio; switched-op amp circuits; track mode THD; Bandwidth; CMOS process; Circuit synthesis; Low voltage; MOSFETs; Operational amplifiers; Rail to rail inputs; Signal design; Signal to noise ratio; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on

Conference_Location

Orlando, FL

Print_ISBN

0-7803-5471-0

Type

conf

DOI

10.1109/ISCAS.1999.780617

Filename

780617