Apparatus for data retention and supply noise mitigation using clamps

An apparatus comprising:

• a first power gate transistor coupled to a gated power supply node and an ungated power supply node;
• a first circuitry coupled to a gate terminal of the first power gate transistor, the first circuitry comprising a first transistor of a first conductivity type and a second conductor of a second conductivity type coupled in series with the first transistor, wherein gate terminals of the first and second transistors of the first circuitry are controllable by separate nodes;
• a second power gate transistor coupled to the gated and ungated power supply nodes;
• and
• a second circuitry coupled to the second power gate transistor, wherein the second circuitry is to weakly turn on the second power gate transistor.

An apparatus comprising:

• an ungated power supply node;
• a gated power supply node;
• and
• a power gate transistor coupled to the ungated power supply node and the gated power supply node, wherein the power gate transistor is operable to be tuned on such that it is diode-connected between the gated and ungated power supply nodes.