Bias generation and distribution for a large array of sensors

A bias generation circuit, comprising:

• a main bias voltage generator coupled to a main bias current and configured to generate a first bias voltage at a first terminal and a second bias voltage at a second terminal through a main NMOS transistor, a main resistor, and a main PMOS transistor serially coupled, wherein the first bias voltage is higher than the second bias voltage;
• and
• an array of sensors, wherein each sensor of the array of sensors comprises a local bias replica coupled to the first terminal and the second terminal and is configured to generate a local bias current through a local NMOS transistor, a local resistor, and local PMOS transistor serially coupled, and wherein the first terminal couples to a gate of the main NMOS transistor and a gate of the local NMOS transistor, the second terminal couples to a gate of the main PMOS transistor and a gate of the local PMOS transistor.