Patent ID: 7821315

Claim:
A circuit for generating an output signal having a duty cycle that is adjustable, the circuit comprising: a first signal input lead that receives a first input signal having a duty cycle of approximately fifty percent of a reference input signal; a second signal input lead that receives a second input signal having a duty cycle of approximately fifty percent of the reference input signal, wherein the second input signal and the first input signal have the same frequency, and wherein the second input signal is approximately ninety degrees out of phase with respect to the first input signal; a signal output lead that outputs the output signal, wherein the duty cycle of output signal is approximately twenty-five percent of the reference input signal; and a plurality of control signal input leads usable to receive control signals, wherein each of the plurality of control signal is usable to adjust a resistance of a variable resistance block, the resistance through the variable resistance being used to adjust the duty cycle of the output signal.