论文信息 - Pseudo-exponential current-to-voltage converter

Pseudo-exponential current-to-voltage converter

This paper proposed a "pseudoexponential" current-to-voltage converter with tunable input dynamic ranges. The proposed circuit uses CMOS transistors in saturation region. The feasibility of this circuit was verified through simulations at 1.5 V supply voltage, using 0.25 μm CMOS process. The results show 30 dB range with the error less than ± 0.5 dB. The proposed circuit can be used for the design of an extremely low-voltage and low-power variable gain amplifier (VGA) and automatic gain control (AGC).

Trung-Kien Nguyen | Quoc-Hoang Duong | Sang-Gug Lee | Hoang-Nam Duong

[1] K. Bult,et al. A class of analog CMOS circuits based on the square-law characteristic of an MOS transistor in saturation , 1987 .

[2] Trung-Kien Nguyen,et al. All CMOS current-mode exponential function generator , 2004, The 6th International Conference on Advanced Communication Technology, 2004..

[3] Mohammed Ismail,et al. CMOS exponential current-to-voltage converter , 1997 .

[4] Sang-Gug Lee. A Low Voltage, Low Power, And High dB-Linear All CMOS Exponential Function Generator for AGC and VGA Applications , 2003 .

[5] A. M. Soliman,et al. Variable gain amplifiers based on a new approximation method to realize the exponential function , 2002 .

[6] Ramesh Harjani,et al. A low-power CMOS VGA for 50 Mb/s disk drive read channels , 1995 .

[7] Trung-Kien Nguyen,et al. Low-voltage low-power high dB-linear CMOS exponential function generator using highly-linear V-I converter , 2003, ISLPED '03.

[8] Dipak Kumar Basu,et al. A digitally controlled variable-gain amplifier† , 1970 .

[9] Cheng-Chieh Chang,et al. Realisation of exponential V-I converter using composite NMOS transistors , 2000 .

[10] Cheng-Chieh Chang,et al. Current-mode pseudo-exponential circuit with tunable input range , 2000 .

[11] Trung-Kien Nguyen,et al. All CMOS current-mode exponential function generator , 2004 .