Differential low noise amplifier (lna) with common mode feedback and gain control

An amplifier, comprising:

• a) an input stage, including (i) a first differential input configured to receive a differential signal, (ii) a first current source coupled to said first differential input, (iii) a first current load receiving a first bias voltage and coupling said input stage to a first power supply, and (iv) a first pair of common mode feedback transistors, coupled to an output of said first current load and configured to limit a current to said first current source, said input stage providing an amplified signal;
• b) an additional stage, including (i) a second differential input configured to receive said amplified signal from said input stage, (ii) a second current source coupled to said second differential input, (iii) a second current load receiving said first bias voltage and coupling said additional stage to said first power supply, and (iv) a second pair of common mode feedback transistors, coupled to an output of said second current load and configured to limit a current to said second current source, said additional stage providing an amplified output;
• c) a first bias circuit configured to provide said first bias voltage to said first and second current loads;
• and
• d) one or more second bias circuits configured to bias said first and second current sources.