Details
![Riccardo Zurla Headshot](https://confcats-catavault.s3.amazonaws.com/CATAVault/ieeecass/master/files/styles/cc_user_photo/s3/user-pictures/16411.jpg?h=2a35d14f&itok=2JiCw_sZ)
- Affiliation
-
AffiliationUniversità degli Studi di Pavia
- Country
This work presents a compensation technique for a three-stage operational amplifier that is derived from nested Miller compensation and comprises a voltage gain stage in the inner compensation path. The voltage gain k of this stage is able to both increase the Miller effect across the inner compensation capacitor and reduce the high-frequency impedance of the output node when compared to the case of standard nested Miller compensation. As a consequence, the gain-bandwidth product is k times higher, while the inner and the outer compensation capacitors are reduced by a factor k² and k, respectively. The proposed compensation technique was applied to a three-stage operational amplifier used to implement a voltage regulator: simulations of the regulator showed a significant improvement of slew rate, settling time, and transient output voltage drop when a load current is suddenly requested.