Abstract: A duty cycle correction circuit for changing the duty cycle for a differential periodic signal is disclosed. The duty cycle correction circuit includes input circuitry for receiving a first differential signal. The differential signal exhibits a first signal component and a complement signal component, each of the components having initial high and low signal levels and respective first and second DC bias levels. The input circuitry includes a differential output having a first path for propagating the first signal component and a second path for propagating the complement signal component. Programmable load circuitry couples to the differential output and includes a programmable input. The load circuitry operates to programmably vary the DC bias level of at least one of the signal components. A differential gain amplifier is coupled to the first differential output and disposed downstream of the load circuitry.