Output buffer with charge-pumped noise cancellation

A system comprising:

• a first chip having a first buffer coupled to a plurality of output pads;
• a second chip having a second buffer coupled to a plurality of one of input and output pads;
• a bus coupled to the first chip and the second chip;
• a first pair of capacitors coupled to a power source;
• a second pair of capacitors coupled to the first pair of capacitors and the power source;
• a first pair of signal sources coupled to the first pair of capacitors;
• and
• a second pair of signal sources coupled to the second pair of capacitors,
• wherein the first pair of signal sources and the second pair of signal sources controls discharge and recharge of the first pair of capacitors and the second pair of capacitors to and from the power source to cancel out noise caused by one of a voltage and a current switching transient in the first chip.

A method comprising:

• sending data to an output buffer;
• determining data about to be clocked;
• determining a state of the data;
• determining a change of state for the data, wherein the data is one of a high state and a low state;
• discharging a circuit if the change in state of the data is from the high state to the low state;
• and
• recharging the circuit if the change in state of the data is from the low state to the high state;
• wherein noise resulting from the change in state is cancelled before occurring at an output by the circuit.

An apparatus comprising a machine-readable medium containing instructions which, when executed by a machine, cause the machine to perform operations comprising:

• sending data to an output buffer;
• determining data about to be clocked;
• determining a state of the data;
• determining a change of state for the data, wherein the data is one of a high state and a low state;
• discharging a circuit if the change in state of the data is from the high state to the low state;
• and
• recharging the circuit if the change in state of the data is from the low state to the high state;
• wherein noise resulting from the change in state is cancelled before occurring at an output by the circuit.