New type of low-power exponential current generator for VGA

作者：Du Yong Qian^*; Zhuang Yi Qi; Li Xiao Ming; Liu Wei Feng

来源：Journal of the University of Electronic Science and Technology of China, 2014, 43(2): 282-286.

DOI：10.3969/j.issn.1001-0548.2014.02.024

• Exponential current
• Linear in dB
• Low Power
• Subthreshold
• VGA

A novel low-power exponential current generator used for VGA is proposed in this paper. This generator adopts a MOSFET biased in sub-threshold region to generate exponential current. To compensate the variation of process and temperature, a threshold detector and a system solution are proposed. The exponential current generator is verified in TSMC 0.18 μm standard CMOS technology. Within a ±0.41 dB error, the dynamic range of the proposed exponential current generator is 30 dB. The power consumption is 11 μW, and the minimum power source voltage is 0.9 V.

• 出版日期2014
• 单位西安电子科技大学