Clock duty cycle measurement

A method for duty cycle measurement, the method comprising:

• receiving, by a first amplifier portion, a first input signal corresponding to a first clock signal and a second input signal corresponding to a second clock signal;
• receiving, by a first amplifier of the first amplifier portion, a first amplifier input signal and a second amplifier input signal;
• and
• receiving, by a second amplifier portion, a first output signal from the first amplifier portion;
• wherein:
• in a first mode of the circuit, the first amplifier is in a closed loop configuration and the first amplifier input signal is based upon, at least in part, the second input signal and the second amplifier input signal is based upon, at least in part, the first input signal;
• in a second mode of the circuit, the first amplifier is in an open loop configuration and the first amplifier input signal is based upon, at least in part, a difference between the second input signal from the first input signal, and the second amplifier input signal is based upon, at least in part, a difference between the first input signal from the second input signal;
• in the second mode of the circuit, an effective input signal magnitude is based upon, at least in part, the difference between the first input signal from the second input signal increased by a factor of two;
• and
• to switch between the first mode of the circuit and the second mode of the circuit, a low frequency clock operating in a range of 10-25 MHz being used.

A system for duty cycle measurement and correction, the system comprising:

• a duty cycle measurement circuit comprising:
• a first amplifier portion configured to receive a first input signal and a second input signal;
• a first amplifier of the first amplifier portion, the first amplifier configured to receive a first amplifier input signal and a second amplifier input signal, wherein:
• in a first mode of the circuit, the first amplifier is in a closed loop configuration and the first amplifier input signal is based upon, at least in part, the second input signal and the second amplifier input signal is based upon, at least in part, the first input signal;
• in a second mode of the circuit, the first amplifier is in an open loop configuration and the first amplifier input signal is based upon, at least in part, a difference between the second input signal from the first input signal, and the second amplifier input signal is based upon, at least in part, a difference between the first input signal from the second input signal;
• in the second mode of the circuit, an effective input signal magnitude is based upon, at least in part, the difference between the first input signal from the second input signal increased by a factor of two;
• and
• to switch between the first mode of the circuit and the second mode of the circuit, a low frequency clock operating in a range of 10-25 MHZ being used;
• and
• a duty cycle adjustment circuit in communication with the duty cycle measurement circuit, the duty cycle adjustment circuit configured to adjust a duty cycle corresponding to a clock based upon, at least in part, a measurement signal output by the duty cycle measurement circuit.