Patent ID: 9667281
Date: 2017-05-30
CPC Classifications: H03K,H04B

Claim:
1. A circuit for correcting single-ended duty cycle distortion (DCD) in an output signal of a transmitter, the circuit comprising: a plurality of unit cells, each unit cell comprising: wherein the outputs of the positive polarity output drivers are coupled together and the outputs of the negative polarity output drivers are coupled together, the coupled together positive polarity output drivers and coupled together negative polarity output driver providing the output signal; a sensing block configured to sense single-ended DCD in the output signal of the transmitter; and a calibration block configured to provide control signals to the plurality of unit cells based on the sensed single-ended DCD of the output signal, the calibration block being further configured to fine-tune the output signal of the transmitter by independently adjusting the pull up strength or the pull down strengths of the pre-drivers of each unit cell to achieve a blended output signal.