Bias generation and distribution for a large array of sensors

A method, comprising:

• providing a current source;
• generating a first bias voltage at a first terminal and a second bias voltage at a second terminal by a bias voltage generator having a main PMOS transistor, a main NMOS transistor, and a main resistor serially coupled, wherein
• a drain and a gate of the main NMOS transistor both coupled to the first terminal;
• a first main resistor terminal of the main resistor couples to a source of the main NMOS transistor;
• and
• a source of the main PMOS coupled to a second main resistor terminal of the main resistor and a drain and a gate of the main PMOS transistor both coupled to the second terminal, wherein the second terminal couples to a main ground;
• mirroring a current of the current source to the bias voltage generator;
• and
• coupling an array of sensors to the first bias voltage and the second bias voltage, wherein each sensor of the array of sensors comprises a local bias replica coupled to the first terminal and the second terminal, and wherein the local bias replica comprises:
• a local NMOS transistor having a gate of the local NMOS transistor coupled to the first terminal;
• a local resistor having a first local resistor terminal and a second local resistor terminal, wherein the first local resistor terminal couples to a source of the local NMOS transistor;
• and
• a local PMOS transistor having a source of the local PMOS transistor coupled to the second local resistor terminal, a gate of the local PMOS transistor coupled to the second terminal, and a drain of the local PMOS transistor coupled to a local ground.