Device and method for generating duty cycle

Abstract

A device for generating a duty cycle includes a converter, a corrector, and a control circuit. The converter is configured to generate a first output signal having a duty cycle to an output terminal according to an input signal. The corrector is coupled to the output terminal, and is configured to adjust the duty cycle of the first output signal according to a control signal. The converter is coupled in parallel with the corrector and between a first power source and a second power source. The control circuit is coupled to the output terminal, and is configured to generate the control signal according to the first output signal and a reference signal.

What is claimed is: 
     
         1 . A device for generating a duty cycle ratio for data, comprising:
 a converter configured to generate a first output signal having the duty cycle ratio to an output terminal according to an input signal;   a corrector coupled to the output terminal, and configured to adjust the duty cycle ratio of the first output signal according to a control signal, wherein the converter is coupled in parallel with the corrector and between a first power source and a second power source; and   a control circuit coupled to the output terminal, and configured to generate the control signal according to the first output signal and a reference signal, wherein the corrector comprises:   a plurality of first current source circuits;   a plurality of first switches coupled between the first power source and the first current source circuits, and configured to be turned on according to a plurality of first switching signals, wherein each of the first current source circuits is configured to generate a first current to the output terminal on a condition that a corresponding one of the first switches is turned on;   a plurality of second current source circuits; and   a plurality of second switches coupled between the second power source and the second current source circuits, and configured to be turned on according to a plurality of second switching signals, wherein each of the second current source circuits is configured to generate a second current on a condition that a corresponding one of the second switches is turned on, and the second current flows from the output terminal to the second power source.   
     
     
         2 . The device of  claim 1 , wherein the control circuit comprises:
 a comparator configured to generate the control signal according to the first output signal and the reference signal;   an encoder configured to generate an encoded signal according to the control signal; and   a demultiplexer configured to generate the first switching signals and the second switching signals according to the encoded signal.   
     
     
         3 . A device for generating a duty cycle ratio for data, comprising:
 a first transistor;   a second transistor configured to cooperate with the first transistor to generate an output signal having the duty cycle ratio to an output terminal according to an input signal; and   a corrector configured to generate at least one current to the output terminal in response to the output signal, to adjust the duty cycle ratio of the output signal,   wherein the at least one current is configured to be not flow through the first transistor and the second transistor, wherein the corrector comprises:   a plurality of first current source circuits;   a plurality of first switches coupled between a first power source and the first current source circuits, and configured to be turned on according to a plurality of first switching signals, wherein each of the first current source circuits is configured to generate a first current of the at least one current to the output terminal on a condition that a corresponding one of the first switches is turned on;   a plurality of second current source circuits; and   a plurality of second switches coupled between a second power source and the second current source circuits, and configured to be turned on according to a plurality of second switching signals, wherein each of the second current source circuits is configured to generate a second current on a condition that a corresponding one of the second switches is turned on, and the second current flows from the output terminal to the second power source.   
     
     
         4 . The device of  claim 3 , further comprising:
 a control circuit configured to control the corrector, wherein the control circuit comprises:
 a comparator configured to generate a control signal according to the first output signal and the reference signal; 
 an encoder configured to generate an encoded signal according to the control signal; and 
 a demultiplexer configured to generate the first switching signals and the second switching signals according to the encoded signal. 
   
     
     
         5 . A method for generating a duty cycle ratio for data, comprising:
 generating, by a converter, an output signal to an output terminal according to an input signal;   generating a control signal based on the output signal and a reference signal; and   generating, by a corrector, at least one current according to the control signal, and transmitting the at least one current to the output terminal without transmitting through the converter to correct the duty cycle ratio of the output signal, wherein the corrector comprises:   a plurality of first current source circuits;   a plurality of first switches coupled between the first power source and the first current source circuits, and configured to be turned on according to a plurality of first switching signals, wherein each of the first current source circuits is configured to generate a first current to the output terminal on a condition that a corresponding one of the first switches is turned on;   a plurality of second current source circuits; and   a plurality of second switches coupled between the second power source and the second current source circuits, and configured to be turned on according to a plurality of second switching signals, wherein each of the second current source circuits is configured to generate a second current on a condition that a corresponding one of the second switches is turned on, and the second current flows from the output terminal to the second power source.   
     
     
         6 . The method of  claim 5 , wherein generating the at least one current comprises:
 generating, by a first current source circuit, a first current of the at least one current to the output terminal on a condition that a first switch is turned on, wherein the first switch is configured to be turned on according to a first switching signal; and   generating, by a second current source circuit, a second current of the at least one current to the output terminal on a condition that a second switch is turned on, wherein the second switch is configured to be turned on according to a second switching signal, and the second current flows from the output terminal to a power source.   
     
     
         7 . The method of  claim 6 , further comprising:
 generating, by an encoder, an encoded signal according to the control signal; and   generating, by a demultiplexer, the first switching signal and the second switching signal according the encoded signal.