Patent ID: 6903601

Claim:
An apparatus including an integrated circuit (IC) with metal oxide semiconductor field effect transistor (MOSFET) circuitry for generating a reference signal having a value which remains substantially constant over variations in one or more of the processing (P) of, power supply voltage (V) for and operating temperature (T) of said IC, comprising: current source circuitry to provide at least one reference current having a current value I; first reference resistance circuitry having a first resistance value R 1 , including first and second terminals, coupled to said current source circuitry and responsive to reception of said at least one reference current by providing a first reference voltage at said first reference resistance circuitry terminal; a first reference MOSFET having a channel width dimension, coupled to said first reference resistance circuitry terminal and responsive to reception of said first reference voltage by conducting a first mirrored current and providing a first bias voltage; current mirror circuitry coupled to said first reference MOSFET and responsive to reception of said first bias voltage by providing said first mirrored current and a second mirrored current; and a second reference MOSFET having a channel width dimension approximately equal to 1/N 2 of said first reference MOSFET channel width dimension, coupled to said current mirror circuitry and said second reference resistance circuitry terminal, and responsive to reception of said second mirrored current by providing a second reference voltage at said second reference resistance circuitry terminal, wherein N is an integer greater than unity and a voltage difference between said first and second reference voltages remains substantially constant over PVT variations.