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A Trimming-Free 3-in-1 Multi-Mode Passive Switched-Capacitor Amplifier With an Absolute Logarithmic Error of 0.5 dB up to 200
一种无需校准的3合1多模式被动开关电容放大器，具有自动增益控制和对数增益功能。
总增益9.5–85.5 dB，输入参考噪声4.7 µVrms，带宽136 kHz
被动开关电容自动增益控制对数放大器温度稳定无需校准
▸无需校准的PVT稳定设计
▸并行分段对数近似技术
▸宽温度范围工作（-25°C至200°C）
Abstract
This work presents a 3-in-1 multi-mode amplifier,
including automatic gain control (AGC) and logarithmic gain,
which achieves a total gain of 9.5–85.5 dB and an input-referred
noise (IRN) of 4.7 µVrms within a bandwidth of 136 kHz. The
PVT-focused amplifier design operates from−25 ◦C to 200 ◦C and
does not require any trimming. Incorporating a parallel piecewise
logarithmic approximation using nine passive-switched-capacitor
(PSC) stages with a fixed gain of three (0.015 dB error per stage),
the te