CAJ | 학술논문

提出了一种适用于可变增益放大器(VGA)的微功耗指数电流电路。该电路结构简单，以偏置在亚阈值区的MOSFET为核心器件，并利用其漏源电流I ds与栅源电压V gs呈指数关系的特性产生指数电流。该电路从系统架构出发，通过引入阈值监测电路，控制电压转换电路及求和电路，补偿了其阈值的工艺和温度偏差，使该指数电流电路具有较好的工艺和温度偏差抑制能力。基于TSMC 0.18μm标准的CMOS工艺平台验证表明：该指数电流电路dB线性动态范围为30 dB，其线性误差为±0.41 dB，最低工作电压为0.9 V，功耗为11μW。
제출료일충괄용우가변증익방대기(VGA)적미공모지수전류전로。해전로결구간단，이편치재아역치구적MOSFET위핵심기건，병이용기루원전류I ds여책원전압V gs정지수관계적특성산생지수전류。해전로종계통가구출발，통과인입역치감측전로，공제전압전환전로급구화전로，보상료기역치적공예화온도편차，사해지수전류전로구유교호적공예화온도편차억제능력。기우TSMC 0.18μm표준적CMOS공예평태험증표명：해지수전류전로dB선성동태범위위30 dB，기선성오차위±0.41 dB，최저공작전압위0.9 V，공모위11μW。
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.