Traditional power delivery networks (PDN) to ASICs have a bandwidth that extends to about 100 kHz such that these PDNs respond with adequate speed and meet performance specifications if the transient load current changes at a rate slower than 100 kHz. As ASICs become more computationally powerful, not only does their current consumption go up, their current transients undergo relatively rapid slew, e.g., with a bandwidth exceeding 10 MHz. The bandwidth mismatch between the PDN and the current demand of the ASIC causes a substantial loss in efficiency.
This disclosure describes a PDN comprising an ensemble of three or more power supplies optimized to differing frequency ranges. A power supply from the ensemble automatically kicks in when transient currents arise with a bandwidth that includes the frequency range of the power supply. Power is delivered across the entire ASIC bandwidth at optimal efficiency and with excellent transient response.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
N/A, "Frequency division multiple supply (FDMS) for fast-response power delivery", Technical Disclosure Commons, (June 13, 2019)