In this paper, a limiting/logarithmic amplifier (LLA) for high dynamic range wideband bioelectrical impedance measurements is presented. The amplifier is composed of eight cascaded gain stages with a folded diode-connected transistor as a load that attain wide bandwidth performance with limited power consumption. The logarithmic conversion of the input variable is carried out with the aid of nine detectors. A prototype in standard 0.35-μm CMOS technology occupies 0.06 mm2 of silicon area and dissipates 2.2 mW from a single 2-V supply. Post-layout results show that the LLA is capable of processing a 65-dB input dynamic range over a frequency interval from 1 kHz to 1 MHz with an accuracy within ± 0.7 dB.
展开▼
机译：本文提出了一种用于高动态范围宽带生物电阻抗测量的限幅/对数放大器（LLA）。该放大器由八个级联增益级和一个折叠的二极管连接的晶体管作为负载组成，可在有限的功耗下实现宽带宽性能。输入变量的对数转换借助九个检测器进行。采用标准0.35-μmCMOS技术的原型占用的硅面积为0.06 mm 2 ，并且通过2V单电源消耗的功率为2.2mW。布局后的结果表明，LLA能够在1 kHz至1 MHz的频率间隔内处理65 dB的输入动态范围，精度在±0.7 dB之内。
展开▼
