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A Low-Offset Operational Amplifier Using Multipath Ping-Pong Current Adjusting Auto-Zeroing Stabilization Technique
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DOI：10.1109/TCSII.2025.3622673.png)
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Abstract
En 中文
Conventional auto-zeroing (AZ) techniques suffered from drawbacks such as feedback stability issues caused by series capacitors in the signal path or increased current consumption due to the use of auxiliary amplifiers. The current-adjusting auto-zeroing (CAAZ) technique, which employs a simple structure that samples offset by adjusting the bias currents, was recently reported. This brief presents a low-offset operational amplifier employing a multipath ping-pong CAAZ stabilization technique. By leveraging the advantages of the previously reported CAAZ technique, this amplifier employs a ping-pong structure to enable continuous operation, while a multipath architecture consisting of high- and low-frequency paths ensures both wide bandwidth and enhanced offset performance. The amplifier is fabricated in a 0.18- $\mu $ m CMOS process, consumes $196.9~\mu $ A from a 1.8 V supply, and achieves a unity-gain bandwidth of 5.01 MHz. It occupies 0.59 mm2 and achieves an input-referred offset of $3.2~\mu $ V with a standard deviation of $3.8~\mu $ V.
Keywords:
Conventional auto-zeroing
current adjusting auto-zeroing
multipath
offset
ping-pong
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