a lot of good answers. just couple points to add:
- Charging a capacitor from 0 to Vdd volts takes E=CVdd^2 amount of energy. To find the power (energy/second) you need to multiply this with how frequently you do this, i.e. clock frequency. So, P=FCVdd^2. So most digitak circuits power scales linearly with frequency, and quadratically with power supply voltage Vdd.
- Half of themis power is resistive loses. This is kinda a fundamental thing. Charging a capacitor with a resistor is "lossy".
- Some of the charge is reused within the circuits
Comments
a lot of good answers. just couple points to add: - Charging a capacitor from 0 to Vdd volts takes E=CVdd^2 amount of energy. To find the power (energy/second) you need to multiply this with how frequently you do this, i.e. clock frequency. So, P=FCVdd^2. So most digitak circuits power scales linearly with frequency, and quadratically with power supply voltage Vdd.
- Half of themis power is resistive loses. This is kinda a fundamental thing. Charging a capacitor with a resistor is "lossy".
- Some of the charge is reused within the circuits