Title :
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
Abstract :
The switched op amp approach provides an effective solution for low voltage circuit design without the need for voltage multiplication or low VT 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 VTP≈0.8 V and VTN≈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 fin=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;
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
DOI :
10.1109/ISCAS.1999.780617
