Circuit which reuses current to synthesize negative impedance

A circuit for synthesizing a negative impedance, comprising:

• a current source circuit, arranged to provide at least one predetermined current, wherein the current source circuit has a first connection port and a second connection port, and the first connection port of the current source circuit is coupled to a first reference voltage;
• a differential circuit, coupled between the second connection port of the current source circuit and a second reference voltage, and arranged to receive a differential input pair and generate a differential output pair, wherein the differential circuit has a differential output port for outputting the differential output pair;
• and
• a negative impedance conversion circuit, coupled between the differential output port and a third reference voltage, wherein the third reference voltage is different from the first reference voltage;
• wherein the differential output port comprises a first output terminal and a second output terminal, and the differential circuit comprises:
• a first load, coupled between the first output terminal and the second reference voltage;
• and
• a second load, coupled between the second output terminal and the second reference voltage;
• wherein the negative impedance conversion circuit and the first load are connected in parallel to the first output terminal, and the negative impedance conversion circuit and the second load are connected in parallel to the second output terminal.