Differential envelope detector having common mode feedback

A differential envelope detector (ED) having common mode feedback, the differential ED comprising:

• an input terminal unit including first and second input terminals configured to respectively receive positive and negative components of a radio frequency (RF) signal received through an antenna or a low-noise amplifier;
• a first voltage output unit provided between the first and second input terminals and configured to output a first common mode voltage;
• a first amplification unit configured to receive first and second input signals respectively corresponding to the positive and negative components of the RF signal as a differential pair and amplify the first and second input signals to output a first output signal;
• a second amplification unit configured to receive the first common mode voltage and operate in a current amplifier mode to output a second output signal;
• a constant current source unit configured to supply a constant DC (direct) current to the first amplification unit and the second amplification unit;
• an output terminal including first and second output terminals to which the first output signal and the second output signal are applied, respectively;
• and
• a second voltage output unit provided between the first and second output terminals and configured to output a second common mode voltage.