Temperature independent current reference

Details Temperature independent current reference Temperature independent current reference

1997-06-02

1999-03-30

Nguyen, Matthew

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

G05F 316

Patent

active

058893946

ABSTRACT:
A current reference (10) includes first and second connected resistors (R1 and R2), a voltage source (12) independent of a supply voltage (Vdd). The voltage source is applied to the first and second resistors (R1 and R2) and has a positive temperature coefficient (TC). The first resistor (R1) has a TC less than the voltage source (12) TC and the second resistor (R2) has a TC greater than the voltage source (12) TC. A resistance value of each of the first and second resistors (R1 and R2) is set such that a combined TC of the first and second resistors (R1 and R2) is essentially equal to the voltage source (12) TC such that the current reference (10) produces a current essentially independent of a temperature of the current reference (10) and the supply voltage (Vdd).

REFERENCES:
patent: 4250445 (1981-02-01), Brokaw
patent: 4335346 (1982-06-01), Streit
patent: 5029295 (1991-07-01), Bennett et al.
patent: 5291122 (1994-03-01), Audy
patent: 5307007 (1994-04-01), Wu et al.
patent: 5315230 (1994-05-01), Cordoba et al.
patent: 5557194 (1996-09-01), Kato
patent: 5666046 (1997-09-01), Mietus

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