Patent ID: 9071293
Filing Date: 2015-06-30
Classification: H03K,H04B

Abstract:
1. A circuit for correcting single-ended duty cycle distortion (DCD) of a transmitter, the circuit comprising: an actuator block configured to adjust an output signal of the transmitter, the actuator block comprising: an output driver, wherein the output driver comprises a positive polarity output driver and a negative polarity output driver; and wherein at least one of the positive polarity pre-driver and the negative polarity pre-driver comprises a plurality of current starved inverters coupled in parallel; wherein at least one of the positive polarity pre-driver and the negative polarity pre-driver is configured to activate and deactivate different numbers of the plurality of current starved inverters to affect the pull UP or pull down strength of the pre-driver based on the at least one digital signal; and a sensing block configured to sense single-ended DCD in the output signal of the transmitter; and a calibration block configured to provide a control signal to the actuator based on the sensed characteristic of the output signal for adjusting the pull up strength or the pull down strength of the pre-driver.