Circuit

A circuit comprising:

• an input terminal;
• a first amplifier coupled to the input terminal of the circuit to receive an input signal;
• a first inductor having a first terminal coupled to the input terminal and a second terminal configured to be coupled to a ground terminal;
• a second inductor, wherein the first inductor is arranged with the second inductor and configured to magnetically couple therewith, wherein said second inductor is coupled to the first amplifier and is configured to sense a current through the first amplifier;
• and
• a first switch having a first terminal coupled to the input terminal and a second terminal coupled to a ground terminal, the ground terminal configured to be coupled to a reference voltage, wherein
• the first amplifier comprises a cascode arrangement of a first transistor and a second transistor, the first transistor having a first terminal, a second terminal and a control terminal, and the second transistor having a first terminal, a second terminal and a control terminal,
• the first terminal of the first transistor is coupled to a supply voltage terminal for receiving a supply voltage,
• the control terminal of the second transistor is coupled to the input terminal,
• the first terminal of the second transistor is coupled with the second terminal of the first transistor to form said cascode arrangement, and
• the second terminal of the second transistor is coupled to the ground terminal.

A circuit comprising:

• an input terminal;
• a first amplifier coupled to the input terminal of the circuit to receive an input signal;
• a first inductor having a first terminal coupled to the input terminal and a second terminal configured to be coupled to a ground terminal;
• and
• a second inductor, wherein the first inductor is arranged with the second inductor and configured to magnetically couple therewith, wherein said second inductor is coupled to the first amplifier and is configured to sense a current through the first amplifier,
• wherein said circuit is formed on an amplifier die and is provided in combination with a switch die, separate from the amplifier die, wherein the combination of the switch die and the amplifier die comprises an arrangement for forming a transceiver front end module,
• said switch die having a first switch-die terminal for coupling to an antenna, a second switch-die terminal coupled to the input terminal of the amplifier-die, and a switch-die-switch having a first terminal, which is coupled to one of the first switch-die terminal and the second switch-die terminal, and a second terminal for coupling to a transmitter terminal, the transmitter terminal for receiving a transmit signal for passing to an antenna at the first switch-die terminal.