Ruggedness protection for rf module

A radio frequency (RF) module comprising:

• a first power amplifier (PA);
• a first bias circuit configured to provide a first direct current (DC) supply to the first PA wherein:
• the first bias circuit includes a bias operational amplifier (Opamp) and an internal feedback path providing a feedback voltage as an input of the bias Opamp;
• and
• the first DC supply provided to the first PA is based on a comparison result between the feedback voltage and a bias threshold voltage;
• and
• a protection structure coupled between the first PA and the first bias circuit, wherein:
• the protection structure is configured to generate a detector voltage by sensing reverse power reflected from an antenna back to at least the first PA;
• and
• the protection structure includes a first protection controller, which is configured to change the feedback voltage to the bias Opamp by injecting current into the internal feedback path of the first bias circuit based on a comparison result between the detector voltage and a threshold voltage, so as to change the first DC supply to the first PA.