Amplifier circuit

An amplifier circuit comprising:

• a first input terminal and a second input terminal configured to receive a differential input signal;
• a first output terminal and a second output terminal configured to output a differential output signal;
• a first transistor and a second transistor electrically connected respectively to the first input terminal and the second input terminal, the first transistor and the second transistor being configured to generate a differential current signal in accordance with the differential input signal;
• a current source electrically connected between a grounding wire and a pair of the first transistor and the second transistor, the current source being configured to supply a static current to the first transistor and the second transistor;
• a first load circuit and a second load circuit configured to generate a differential voltage signal as an amplified signal from the differential input signal;
• a first emitter-follower circuit and a second emitter-follower circuit, the first emitter-follower circuit being electrically connected between the first load circuit and the first output terminal, the second emitter-follower circuit being electrically connected between the second load circuit and the second output terminal, and the first emitter-follower circuit and the second emitter-follower circuit being configured to generate the differential output signal in accordance with the differential voltage signal;
• a first cascode transistor and a second cascode transistor, the first cascode transistor being electrically connected between the first transistor and the first load circuit, the second cascode transistor being electrically connected between the second transistor and the second load circuit;
• and
• a first shunt transistor and a second shunt transistor, the first shunt transistor being electrically connected between the first transistor and the first emitter-follower circuit, the second shunt transistor being electrically connected between the second transistor and the second emitter-follower circuit;
• wherein the differential current signal includes a first differential current and a second differential current, the first differential current flowing through the first cascode transistor and the second cascode transistor, and the second differential current flowing through the first shunt transistor and the second shunt transistor;
• wherein the first load circuit and the second load circuit are configured to convert the first differential current into the differential voltage signal, and
• wherein the first emitter-follower circuit and the second emitter-follower circuit are configured to
• generate a first emitter-follower current and a second emitter-follower current, and
• generate the differential output signal by diverting the second differential current from the first emitter-follower current and the second emitter-follower current.