Charge injector with integrated level shifter for localized mitigation of supply voltage droop

An apparatus comprising:

• a first power supply rail to provide a first power supply voltage;
• a second power supply rail to provide a second power supply voltage, wherein the first power supply voltage is higher than the second power supply voltage;
• a voltage regulator coupled to the first and second power supply rails, wherein the voltage regulator is to regulate the second power supply voltage using the first power supply voltage as input;
• a transistor coupled to the second power supply rail and a third power supply rail, wherein the transistor is controllable by a low power mode signal;
• a first circuitry coupled to the first and third supply rails, wherein the first circuitry is to operate using the first power supply voltage, and wherein the first circuitry is to inject charge on to the third power supply rail in response to a droop indication;
• and
• a second circuitry to detect voltage droop on the third power supply rail, wherein the second circuitry is to generate the droop indication for the first circuitry.

A system comprising:

• a memory;
• a processor coupled to the memory, wherein the processor comprises multiple power domains that can be controlled independent from one another, wherein the multiple power domains include a first power domain and a second power domain, and wherein the processor comprises:
• a first power supply rail to provide a first power supply voltage;
• a second power supply rail to provide a second power supply voltage, wherein the first power supply voltage is higher than the second power supply voltage;
• a voltage regulator coupled to first and second power supply rails, wherein the voltage regulator is to regulate a second power supply voltage using the first power supply voltage as input;
• a first transistor coupled to the second power supply rail and a third power supply rail, wherein the first transistor and the third power supply rail are part of the first power domain;
• a second transistor coupled to the second power supply rail and a fourth power supply rail, wherein the second transistor and the fourth power supply rail are part of the second power domain;
• a first pair of first and second circuitries in the first power supply domain, wherein the first circuitry is to inject charge on the third power supply rail in response to a droop indication by the second circuitry, and wherein the second circuitry is to detect a voltage droop on the third power supply rail;
• and
• a second pair of first and second circuitries in the second power supply domain, wherein the first circuitry of the second pair is to inject charge on the fourth power supply rail in response to a droop indication by the second circuitry of the second pair, and wherein the second circuitry of the second pair is to detect a voltage droop on the fourth power supply rail;
• and
• a wireless interface to allow the processor to communicate with another device.

An apparatus comprising:

• a first power supply rail to provide a first power supply voltage;
• a second power supply rail to provide a second power supply voltage, wherein the first power supply voltage is higher than the second power supply voltage;
• a first circuitry coupled to the first and second supply rails, wherein the first circuitry is to operate using the first power supply voltage, wherein the first circuitry is to inject charge on to the second power supply rail in response to a droop indication, and wherein the first circuitry comprises a level-shifter with an asymmetric input pair circuitry;
• a second circuitry to detect voltage droop on the second power supply rail, wherein the second circuitry is to generate the droop indication for the first circuitry;
• and
• a voltage regulator coupled to the first and second power supply rails, wherein the voltage regulator is to regulate the second power supply voltage using the first power supply voltage as input.