This brief presents an on-chip, real-time rotation calibration (RRC) technique aimed at alleviating the inter-channel offset mismatch in time-interleaved (TI) successive-approximation register analog-to-digital converter (SAR ADC). By leveraging auto-rotation calibration and self-compensation strategies in the analog domain, the proposed technique demonstrates robust performance across PVT variations. Two additional sub-channels are involved in the TI quantization mechanism, where the continuous rotation of the sampling clock distribution ensures their operation in calibration mode. To validate the effectiveness of the proposed calibration, an$8\times 8$bit 8 GS/s TI-SAR ADC is designed and implemented in a 28-nm process and occupies an active area of 0.273 mm2, with each sub-channel SAR ADC covering only$86\times 23~\mu $m. Extensive simulation results validate the efficacy of RRC, demonstrating significant improvements in dynamic performance. Specifically, SNDR increases from 37.1 to 45.4 dB, while SFDR rises from 57.8 to 60.7 dB, as observed at the Nyquist input frequency.

The majority of existing control methods on the basis of deadbeat predictive current control (DPCC) solely consider the impact of a single disturbance on the system. This paper presents an improved DPCC method for permanent magnet synchronous motor (PMSM) with multi-disturbance mitigation. Firstly, the speed loop utilizes a linear active disturbance rejection controller (LADRC) technique. Employing the total disturbance concept, it effectively suppresses both non-periodic and periodic disturbances in the speed loop. To address disturbances arising from model mismatch, the current loop incorporates an extended state observer (ESO) for compensating disturbances and estimating control currents. The proposed control scheme effectively suppresses various disturbances simultaneously. The simulation outcomes affirm the efficacy of the proposed approach.

The demand for permanent magnet resolvers is rising significantly with the increase of operation speed in the electric propulsion system. In this paper, the rotor-pole number (RPN) cooperation strategy is proposed from the perspective of phase shift on the modular flux switching permanent magnet (FSPM) resolver with yokeless stator. The RPN cooperation strategy is deduced analytically by adjusting the angle fitting ratio under the fixed 90-degree sine and cosine winding phase shift electric angle. Moreover, its restrictions are also derived by the flux leakage and permeance analysis in certain cases. Therefore, the proposed cooperation strategy and its limitations enrich the field modulation principle in the PM resolver application. Based on the proposed cooperation strategy and its limitation, a series of proper rotor and stator combinations are proposed in the FSPM resolver with no more than 1.5% total harmonic distortion (THD) evaluated in finite element analysis (FEA).