Transmitter and communication system

Abstract

A transmitter of the present disclosure includes: an output terminal; a driver that performs transition of a voltage of the output terminal among a plurality of voltages; and a controller that controls the driver to cause transition start timing in one voltage transition in voltage transition among the plurality of voltages to be later than transition start timing in another voltage transition.

1 . (canceled) 
     
     
         2 . A transmitter comprising:
 an output terminal;   a driver configured to perform transition of a voltage of the output terminal among a plurality of voltages including a first voltage, a second voltage, and a third voltage; and   a controller configured to control the driver to cause transition start timing in a first voltage transition type in voltage transition among the plurality of voltages to be different from transition start timing in a second voltage transition type among the plurality of voltages.   
     
     
         3 . The transmitter according to  claim 2 , wherein transition start timing in voltage transition from the third voltage to the first voltage or the second voltage is later than transition start timing in voltage transition between the first voltage and the second voltage. 
     
     
         4 . The transmitter according to  claim 2 , wherein transition start timing in voltage transition between the first voltage and the second voltage is later than transition start timing in voltage transition from the first voltage or the second voltage to the third voltage. 
     
     
         5 . The transmitter according to  claim 2 , wherein the controller has one or more time delay circuits that set each transition start timing. 
     
     
         6 . The transmitter according to  claim 5 , wherein at least one of the one or more time delay circuits is configured to allow a delay amount to be varied. 
     
     
         7 . The transmitter according to  claim 2 , wherein
 the driver includes two driver circuits, and   each of the driver circuits has   a first switch including a first terminal coupled to a first power supply that outputs a voltage corresponding to the first voltage, and a second terminal coupled to the output terminal, and   a second switch including a first terminal coupled to a second power supply that outputs a voltage corresponding to the second voltage, and a second terminal coupled to the output terminal.   
     
     
         8 . The transmitter according to  claim 7 , wherein at the time of voltage transition from the first voltage to the third voltage, the controller turns on each of the second switches once and turns off each of the first switches once during a predetermined period, and thereafter turns off one of the second switches and turns on one of the first switches. 
     
     
         9 . The transmitter according to  claim 7 , wherein at the time of voltage transition from the first voltage to the third voltage, the controller turns on each of the first switches and each of the second switches once during a predetermined period, and thereafter turns off one of the first switches and one of the second switches. 
     
     
         10 . The transmitter according to  claim 8 , wherein the controller has one or more time delay circuits that set a time length of the predetermined period. 
     
     
         11 . The transmitter according to  claim 7 , wherein
 the driver sets a voltage of the output terminal to the first voltage by turning on each of the first switches and turning off each of the second switches,   the driver sets the voltage of the output terminal to the second voltage by turning on each of the second switches and turning off each of the first switches, and   the driver sets the voltage of the output terminal to the third voltage by turning on one of the first switches and turning off the other, and turning on one of the second switches and turning off the other.   
     
     
         12 . The transmitter according to  claim 2 , wherein the driver has
 a first switch having one end and the other end, the one end being led to a first power supply that outputs a voltage corresponding to the first voltage, and the other end being led to the output terminal, and   a second switch having one end and the other end, the one end being led to a second power supply that outputs a voltage corresponding to the second voltage, and the other end being led to the output terminal.   
     
     
         13 . The transmitter according to  claim 12 , wherein at the time of voltage transition from the first voltage to the third voltage, the controller turns on the second switch once and turns off the first switch during a predetermined period, and thereafter turns off the second switch. 
     
     
         14 . The transmitter according to  claim 12 , wherein at the time of voltage transition from the first voltage to the third voltage, the controller turns on the first switch and the second switch once during a predetermined period, and thereafter turns off each of the first switch and the second switch. 
     
     
         15 . The transmitter according to  claim 12 , wherein
 the driver sets a voltage of the output terminal to the first voltage by turning on the first switch and turning off the second switch,   the driver sets a voltage of the output terminal to the second voltage by turning on the second switch and turning off the first switch, and   the driver sets a voltage of the output terminal to the third voltage via one or more termination resistors by turning off the first switch and the second switch.