Apparatus and techniques for jammer signal filtering

A method for signal filtering, comprising:

• sampling, via a first transistor, a voltage at a node and on a first capacitive circuit during a first phase of a clock signal;
• generating, via the first capacitive circuit, a first level-shifted voltage at a gate of a second transistor during a second phase of the clock signal, the second phase being after the first phase;
• and
• sampling, via the second transistor, the voltage at the node and on a second capacitive circuit during the second phase based on the first level-shifted voltage.

An amplifier comprising:

• an input transistor with a gate coupled to an input voltage node;
• a cascode transistor with a source coupled to a drain of the input transistor;
• a first filter coupled between a source of the cascode transistor and a gate of the cascode transistor;
• and
• a load coupled between an output node of the amplifier and the cascode transistor.