Programmable equalizer

An equalizer, comprising:

• a first transistor and a second transistor both configured to receive a first input signal;
• a third transistor and a fourth transistor both configured to receive a second input signal;
• a first impedance coupled between the second transistor and the third transistor;
• a second impedance coupled between the first transistor and the fourth transistor;
• a first load resistance coupled between the first transistor and the second transistor and a first supply node;
• a second load resistance coupled between the third transistor and the fourth transistor and the first supply node;
• a first bias current source coupled to the first transistor, the second impedance and a second supply node;
• a second bias current source coupled to the second transistor, the first impedance and the second supply node;
• a third bias current source coupled to the third transistor, the first impedance and the second supply node;
• a fourth bias current source coupled to the fourth transistor, the second impedance and the second supply node;
• and
• a controller;
• wherein the controller is configured to adjust the first, second, third and fourth current sources to route a first percentage of an amplification current through the first impedance and a second percentage of the amplification current through the second impedance.