Method and apparatus for temperature adjusted control of BATFET current sensing

An apparatus for temperature adjusted control for a current sensing component, comprising:

• a current sensing component inserted in a voltage line, wherein the current sensing component measures current in the voltage line;
• and
• a feedback loop component that tracks a temperature of the current sensing component and modulates a resistance of the current sensing component based on the tracked temperature wherein the current sensing component comprises one of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and a Battery Field-Effect Transistor (BATFET), and further wherein the current sensing component comprises a BATFET, and wherein the feedback loop component detects a temperature of the BATFET and modulates a gate voltage of the BATFET based on the detected temperature, and further wherein the BATFET receives a first voltage in the voltage line, and wherein the feedback loop component comprises:
• a BATFET replica that receives the first voltage and outputs a second voltage, wherein the BATFET replica comprises a plurality of field effect transistors (FET) in series such that a sense point of the BATFET replica is programmable by selecting an amount of the FETs used in the BATFET replica;
• an error amplifier that receives the second voltage and the third voltage and outputs a fourth voltage;
• and a second amplifier that receives the fourth voltage and outputs a fifth voltage to a gate of the BATFET.

A method of adjusting a resistance of a current sensing component to adjust for temperature and process variations, the method comprising:

• receiving a first voltage at a current sensing component inserted in a voltage line;
• detecting a temperature of the current sensing component via a feedback loop component;
• and
• adjusting a resistance of the current sensing component via the feedback loop component based on the detected temperature;
• wherein the current sensing component comprises a BATFET, the method further comprising:
• modulating a gate voltage of the BATFET based on the detected temperature in order to adjust the resistance of the BATFET;
• and further comprising
• receiving the first voltage at a BATFET replica that outputs a second voltage;
• receiving the first voltage at a programmable resistor that outputs a third voltage;
• amplifying a difference between the second voltage and the third voltage at an error amplifier that outputs a fourth voltage;
• receiving the fourth voltage at a track and hold amplifier;
• and
• outputting a fifth voltage from the track and hold amplifier to a gate of the BATFET.

A method of adjusting a resistance of a current sensing component to adjust for temperature and process variations, the method comprising:

• receiving a first voltage at a current sensing component inserted in a voltage line;
• detecting a temperature of the current sensing component via a feedback loop component;
• and
• adjusting a resistance of the current sensing component via the feedback loop component based on the detected temperature;
• wherein the current sensing component comprises a BATFET, the method further comprising:
• modulating a gate voltage of the BATFET based on the detected temperature in order to adjust the resistance of the BATFET;
• and further comprising
• receiving the first voltage at a BATFET replica that outputs a second voltage, wherein the BATFET replica comprises a plurality of field effect transistors (FET) in series;
• adjusting a sense point of the BATFET replica by selecting an amount of the FETs used in the BATFET replica;
• amplifying a difference between the second voltage and the third voltage at an error amplifier that outputs a fourth voltage;
• receiving the fourth voltage at a track and hold amplifier;
• and
• outputting a fifth voltage from the track and hold amplifier to a gate of the BATFET.