Noise cancellation apparatus and method

A device comprising:

• an amplifier stage having inputs connected to outputs of a receiver;
• a noise reduction stage connected between two outputs of the amplifier stage, wherein the noise reduction stage comprises a first variable resistor connected in series with a second variable resistor, and wherein the first variable resistor and the second variable resistor are configured such that:
• the first variable resistor has a first resistance variation and the second variable resistor has a second resistance variation equal to the first resistance variation in an opposite direction;
• and
• the first resistance variation is so selected that differential mode noise and common mode noise cancel each other;
• and
• a feedback loop stage connected between the two outputs of the amplifier stage, wherein an input of a buffer of the noise reduction stage is connected to an input of the feedback loop stage.

An apparatus comprising:

• an amplifier stage comprising a common gate circuit;
• a noise reduction stage connected between two outputs of the amplifier stage, wherein the noise reduction stage comprises a buffer, a first adjustable resistor and a second adjustable resistor, wherein an input of the buffer is connected to a reference voltage and an output of the buffer is connected to a common node of the first adjustable resistor and the second adjustable resistor;
• and
• a feedback loop stage connected between the two outputs of the amplifier stage.