# A 4.5 GΩ-Input Impedance Chopper Amplifier With Embedded DC-Servo and Ripple Reduction Loops for Impedance Boosting to Sub-Hz

> Research article (IEEE Transactions on Circuits & Systems II Express Briefs, 2020) · cited 20× · AI/ML

**Wikidata**: [openalex:W3041229157](https://www.wikidata.org/wiki/openalex:W3041229157)  
**Source**: https://4ort.xyz/entity/a-4-5-g-input-impedance-chopper-amplifier-with-embedded-dc-servo-and-ripple-reduction-loops-for-impedance-boosting-to-su