Active inductance circuit and differential amplifier circuit

A differential amplifier circuit comprising:

• a first active inductance circuit;
• a second active inductance circuit;
• and
• a differential pair comprising a first transistor and a second transistor;
• wherein control terminals of the first and second transistors are input terminals for differential signals,
• output terminals of the first and second active inductance circuits are connected to first signal terminals of the first and second transistors respectively;
• the first signal terminals of the first and second transistors are differential signal output terminals,
• second signal terminals of the first and second transistors are connected to a current source,
• each of the first and second active inductance circuits comprises a third transistor comprising a control terminal, a first signal terminal, and a second signal terminal;
• a fourth transistor different in conductivity type from the third transistor, comprising a control terminal, a first signal terminal, and a second signal terminal;
• a capacitor;
• and a second current source,
• the first signal terminal of the third transistor is connected to an output terminal,
• the control terminal of the fourth transistor is connected to the first signal terminal of the third transistor,
• the control terminal of the third transistor is connected to the second signal terminal of the fourth transistor, and
• the second signal terminal of the fourth transistor is connected to a terminal of the second current source and a terminal of the capacitor.