← 返回 JSSC 论文列表JSSC 2020第10期Other0.18µm
A 15-Channel Orthogonal Code Chopping Instrumentation Amplifier for Area-Efficient, Low-Mismatch Bio-Signal
提出一种15通道正交码斩波仪表放大器，实现高效面积和低增益失配的多通道生物信号采集。
0.18µm CMOS, 0.019 mm²/Ch., 0.43% gain mismatch, 1.97 µW/Ch., < −51.5 dB crosstalk, 490-Hz bandwidth
正交码斩波仪表放大器多通道采集低功耗低增益失配
▸正交码直接调制各通道并合并为单一信号共享仪表放大器
▸动态偏移补偿低功耗
▸数字化前解调技术减少纹波噪声并去除解调和编码开销
Abstract
This article presents a 15-channel orthogonal code chopping instrumentation amplifier (OCCIA) for an area- efficient and low gain-mismatch multi-channel bio-signal acquisi- tion. Orthogonal codes directly modulate each channel and merge into a single signal for sharing IA, while performing dynamic offset compensation with low power consumption. Digitization- before-demodulation (DBD) transmits the combined modulated data directly, which alleviates ripple noise, and completely removes the demodulation and TX encoding overhead from the ASIC. The proposed OCCIA in 0.18- µm1 P 6 MC M O S , when compared with the recent multi-channel instrumentation amplifiers (IAs), shows the smallest area (0.019 mm 2/Ch.), low gain mismatch (0.43%), with the lowest power consumption (1.97 µW/Ch.) and low crosstalk ( < −51.5 dB) at 490-Hz bandwidth.