What is claimed is:
1. A multiple Supply Voltage device comprising:
a core network operative at a first Supply Voltage; and
a control network coupled to said core network wherein said control network is configured to transmit a control signal, said control network comprising: an up/down (up/down) detector configured to detect a power state of said core network; processing circuitry coupled to said up/down detector and configured to generate said con trol signal based on said power state;
one or more feedback circuits coupled to said up/down detector, said one or more feedback circuits configured to provide feedback signals to adjust a current capacity of said up/down detector;
at least one first transistor coupled to a second Supply Voltage, the at least one more first transistor being con figured to Switch on when said first Supply Voltage is powered down and to switch off when said first supply Voltage is powered on;
at least one second transistor coupled in series with the at least one first transistor and coupled to said first Supply Voltage, the at least one second transistor being configured to Switch on when said first Supply Voltage is powered on and to switch off when said first supply voltage is powered down;
at least one third transistor coupled in series between the at least one first transistor and the at least one second transistor.
It's covering a way to reduce leakage power during the brief period when a core power supply turns off while the I/O remains powered. Presumably this makes it more efficient to turn power on and off more granularly.
Visually, they added M8 and its gate signal:
View attachment 828603
to what had been the prior art:
View attachment 828604
M5 looks like an implementation detail and mirrors the role of M6 in presumably reducing leakage in the off state. The "signal processor" is described as an inverting amp, so nothing more than the inverting signal amp shown in the prior art.
Alternatively the feedback path can support the power on detection:
View attachment 828607
Or both. But Apple will have violated the claim if they add the single M8 transistor.
So, to everyone screaming "Innovation!", this is what innovation looks like: one transistor added in parallel with another. Humanity advances in baby steps, people...