A bit longer story, they add a transistor before the voltage divider that is doing that measurement, and keep the circuit open most of the time:
> so in the MIT researchers’ chip, the divider is surrounded by a block of additional circuit elements, which grant access to the divider only for the fraction of a second that a measurement requires
That's not something you'd do in any high power PSU. It is really an IoT thing. It will decrease the full-on efficiency, while increasing the sleep efficiency.
I also don't think they are using a 1 MHz PWM anywhere. That number probably leaked into the journalist notes from some irrelevant detail.
> so in the MIT researchers’ chip, the divider is surrounded by a block of additional circuit elements, which grant access to the divider only for the fraction of a second that a measurement requires
That's not something you'd do in any high power PSU. It is really an IoT thing. It will decrease the full-on efficiency, while increasing the sleep efficiency.
I also don't think they are using a 1 MHz PWM anywhere. That number probably leaked into the journalist notes from some irrelevant detail.