Wideband low noise amplifier (LNA) with a reconfigurable bandwidth for millimeter-wave 5G communication

A RF receiver circuit comprising an LNA circuit to amplify a received signal, the LNA circuit comprising:

• a first amplifier stage, comprising:
• a first transistor;
• a second transistor coupled to the first transistor;
• a first inductor coupled in between an input port and a gate of the first transistor;
• a first capacitor bank coupled in parallel with the first inductor;
• and
• a second inductor coupled to a source of the first transistor, wherein the first inductor and the second inductor resonates with a gate capacitance of the first transistor respectively for a dual-resonance input matching;
• a second amplifier stage, comprising:
• a third transistor;
• a fourth transistor coupled between the third transistor and an output port;
• and
• a passive network coupled to a gate of the third transistor;
• and
• a capacitor coupled in between the first and the second amplifier stages, wherein the capacitor transforms an impedance of the passive network to an optimal load for the first amplifier stage.

A radio frequency (RF) frontend circuit comprising an RF receiver to receive an RF signal, the RF receiver comprising an LNA to amplifier the received RF signal, the LNA comprising:

• a first amplifier stage, comprising:
• a first transistor;
• a second transistor coupled to the first transistor;
• a first inductor coupled in between an input port and a gate of the first transistor;
• and
• a second inductor coupled to a source of the first transistor, wherein the first inductor and the second inductor resonates with a gate capacitance of the first transistor respectively for a dual-resonance input matching;
• a second amplifier stage, comprising:
• a third transistor;
• a fourth transistor coupled between the third transistor and an output port;
• and
• a passive network coupled to a gate of the third transistor, the passive network having a fifth inductor in parallel with a first resistor;
• and
• a capacitor coupled in between the first and the second amplifier stages, wherein the capacitor transforms an impedance of the passive network to an optimal load for the first amplifier stage.