Current mirror with low static current and transconductance amplifier thereof

A transconductance amplifier comprising:

• a voltage amplifier stage for amplifying a voltage;
• a transconductance stage coupled to the voltage amplifier stage for converting the voltage into a current;
• and
• a current amplifier stage coupled to the transconductance stage and containing a current mirror with a low static current for amplifying the difference between a first input current and a second input current, the current mirror including:
• a load, which has a first end coupling to the first input current and a second end with a fixed voltage difference imposed in between;
• a first transistor, whose drain is coupled to the second end of the load, whose gate is coupled to the first end of the load, and whose source is coupled to the second input current;
• a second transistor, whose drain is coupled to a second port, whose gate is coupled to the second end of the load, and whose source is coupled to the ground;
• and
• a third transistor, whose drain is coupled to a third port and the output current, whose gate is coupled to the second end of the load, and whose source is coupled to the ground.