A VHF-level fully integrated multi-phase switching converter using bond-wire inductors, on-chip decoupling capacitors and DLL phase synchronization

Phase synchronization techniques in multiphase hysteretic controlled switching power converters

“…Moreover, to ensure accurate output regulation, this scheme requires careful control of fine duty cycle correction, which makes design more complicated. A different, edge triggered DLL multiphase synchronization scheme with cycle-by-cycle current sharing is reported in [5] and its architecture is shown in Fig. 3.…”

“…Since this scheme does not require additional control loops for duty cycle correction, the design becomes simpler and more power and area efficient. The studied design in [5] is demonstrated with SPICE simulation in a four-phase buck converter operating at 200MHz f SW each phase. The input and output voltages are 1.1V and 0.8V, respectively.…”

“…However, both designs require signal sampling at a frequency much higher than of the converter's f SW . In this paper, we study the DLL-based multiphase synchronization techniques that have been reported to achieve very high f SW synchronization [4], [5]. It achieves automatic on-chip phase synchronization among all phases and thus eliminates the need for aforementioned very high frequency external clock control.…”

Variable Spurious Noise Mitigation Techniques in Hysteretic Buck Converters

“…hysteretic band, bias current, etc...). Several flavors of frequency regulation loops have been proposed in the literature [7][8][9][10][11][12][13][14][15] and employed in some industrial implementations [16,17] to mitigate the issue of switching frequency variability in hysteretic controllers using either digital or analog implementations and targeting both current-mode and voltage-mode hysteretic power converters. The performance of the different frequency regulation loops varies in terms of the achieved accuracy, power consumption and added area overhead.…”

“…loop stability. Several flavors of frequency control loops have been proposed in the literature using either digital or analog implementations and targeting both current-mode and voltagemode hysteretic power converters[7][8][9][10][11][12][13][14][15]. The performance of the different frequency control loops varies in terms of the achieved accuracy, power consumption and added area overhead.A careful investigation of the system-level diagram of the hysteretic power converter with the frequency control loop included reveals that many of the inherent advantages of hysteretic control had been negated.…”