Generating reference voltages

Details Generating reference voltages Generating reference voltages

2006-07-04

2006-07-04

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

Reexamination Certificate

active

07071670

ABSTRACT:
A reference voltage is generated between a first node and a second node. A resistive element and a junction device are coupled in series between the first node and the second node. The junction device includes a junction between dissimilar materials, and has a negative temperature coefficient. First and second current sources route respective first and second bias currents to the resistive element and to the junction device. Routing is such that a resulting first branch current through the resistive element is generally not equal to a resulting second branch current through the junction device. The second bias current depends less on manufacturing process variation than the first bias current, and the second branch current can contain more of it, for less dependence on process. The second bias current can be generated by a source that uses the generated reference voltage as a reference.

REFERENCES:
patent: 5936392 (1999-08-01), Taylor
patent: 6225856 (2001-05-01), Toth
patent: 6232829 (2001-05-01), Dow
patent: 6501256 (2002-12-01), Jaussi et al.
patent: 6507180 (2003-01-01), Eguchi
Buck et al., “A CMOS Bandgap Reference Without Resistors”, IEEE Journal of Solid-State Circuits, vol. 37, No. 1, pp. 81-83, Jan. 2002.

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