Title :
A novel CMOS exponential voltage generator based on differential pair´s transfer characteristic
Author :
Yun, Ting-Hua ; Wu, Jim-Hui ; Shi, Long-xing
Author_Institution :
Nat. ASIC Syst. Eng. Technol. Res. Center, Southeast Univ., Nanjing, China
Abstract :
A novel voltage-mode CMOS exponential function circuit for VGAs is developed in this paper. The core circuit is based on a traditional differential pair and a newly-designed three-transistor differential pair. The generated exponential voltage starts from, but does not cross, the 0 V point. On a 0.25 μm CMOS process, the simulation results with 3.3 V supply voltage show that the dB-linear function in the entire voltage control range achieves over 50 dB range with an error less than 1 dB.
Keywords :
CMOS analogue integrated circuits; active networks; analogue multipliers; automatic gain control; transfer functions; 0.25 micron; 3.3 V; AGC systems; CMOS exponential voltage generator; VGA; analog multiplier; differential pair transfer characteristics; voltage control range dB-linear function; voltage-mode exponential function circuit; Application specific integrated circuits; CMOS technology; Character generation; Circuit simulation; Dynamic range; Gain control; MOSFETs; Systems engineering and theory; Threshold voltage; Voltage control;
Conference_Titel :
Communications, Circuits and Systems, 2005. Proceedings. 2005 International Conference on
Print_ISBN :
0-7803-9015-6
DOI :
10.1109/ICCCAS.2005.1495295
