Parameter control circuit

A parameter control circuit, comprising:

• an interface circuit inputting and outputting data that have multiple speeds;
• a frequency detection part detecting a frequency of a clock which is input into the interface circuit or a frequency of a clock of the data;
• an equalizer changing characteristics of the interface circuit;
• a parameter calculation control part calculating a circuit parameter of the equalizer and controlling characteristics of the equalizer according to the frequency detected by the frequency detection part;
• an analog to digital converter converting the analog voltage output of the parameter calculation control part to a digital code;
• a decoder decoding a digital code and outputting a decode signal;
• and
• a single-ended amplifier receiving the decode signal, wherein
• the single-ended amplifier includes a plurality of buffers coupled in parallel and a plurality of switches that are coupled to each of the buffers and are controlled by the decode signal.

A parameter control circuit, comprising:

• an interface circuit inputting and outputting data that have multiple speeds;
• a frequency detection part detecting a frequency of a clock which is input into the interface circuit or a frequency of a clock of the data;
• an equalizer changing characteristics of the interface circuit;
• and
• a parameter calculation control part calculating a circuit parameter of the equalizer and controlling characteristics of the equalizer according to the frequency detected by the frequency detection part, wherein
• the parameter calculation control part outputs the circuit parameter as an analog current;
• the equalizer includes a current mirror circuit which includes a first transistor, a second transistor, a third transistor, and a fourth transistor, and includes a differential amplifier which is coupled to the fourth transistor, wherein the analog current is supplied to the first transistor and the second transistor.