Inductively coupled multi-stack amplifier

A radio frequency (RF) transceiver, comprising:

• a transmit chain comprising an amplifier, wherein the amplifier comprises:
• a first transistor stack comprising a first input node, a first transistor, and a second transistor;
• a second transistor stack comprising a second input node, a third transistor, and a fourth transistor, wherein the first input node and the second input node form an input pair for a differential input signal;
• a first inductive element having a first terminal coupled between the first transistor and the second transistor;
• and
• a second inductive element having a second terminal coupled to a drain of the second transistor, wherein the first inductive element is arranged to be inductively coupled to the second inductive element;
• one or more memories;
• and
• one or more processors coupled to the one or more memories and the transmit chain, the one or more processors being configured to provide a signal to the transmit chain for transmission.

A method of operating an amplifier, comprising:

• outputting a first control signal that triggers a first set of switches to switch from a first mode to a second mode;
• and
• amplifying a first differential input signal, via an amplifier, while the first set of switches is in the second mode, wherein the amplifier comprises:
• a first transistor stack comprising a first input node, a first transistor, and a second transistor;
• a second transistor stack comprising a second input node, a third transistor, and a fourth transistor, wherein the first input node and the second input node form an input pair for the first differential input signal;
• a first inductive element having a first terminal coupled between the first transistor and the second transistor;
• and
• a second inductive element having a second terminal coupled to a drain of the second transistor, wherein the first inductive element is arranged to be inductively coupled to the second inductive element.