Signal amplification apparatus based on load resistance control and audio terminal including the same

A terminal which reproduces an audio, comprising:

• an audio input module which receives a digital signal based audio signal;
• a signal conversion module which converts the audio signal into an analog signal based audio input signal;
• an amplification processing module which selects at least one load resistor based on a load value of an output terminal connected to an audio output module and controls a current by means of at least one selected load resistor to amplify the audio input signal;
• and
• the audio output module which transmits an audio output signal amplified by the current controlled based on at least one selected load resistor to the connected output terminal,
• wherein the amplification processing module comprises:
• an input end which receives the audio input signal;
• a first load resistance controller and a second load resistance controller which select at least one load resistor based on a predetermined control signal and control the current through at least one selected load resistor;
• an amplification processor which amplifies the audio input signal based on the controlled current;
• and
• an output end which outputs the audio output signal obtained by amplifying the audio input signal to the output terminal,
• wherein the amplification processing module further comprises a first current blocking unit and a second current blocking unit which block a current when the signal amplification is not performed, and
• wherein each of the first current blocking unit and the second current blocking unit is configured by an MOS transistor, and the first current blocking unit is connected to one end of the first load resistance controller and the second current blocking unit is connected to one end of the second load resistance controller.