Temperature independent low voltage reference circuit

Details Temperature independent low voltage reference circuit Temperature independent low voltage reference circuit

2007-10-09

2007-10-09

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S315000

Reexamination Certificate

active

10909169

ABSTRACT:
A temperature independent low voltage reference circuit comprises a first transistor with a threshold voltage Vth having a negative temperature coefficient. A diode having a forward voltage drop with a negative temperature coefficient coupled with its anode connected to the drain of the first transistor and its cathode connected to the gate of the first transistor. A first resistor coupled between a power supply terminal and the drain of the first transistor. A low voltage supply terminal connected to the source of the first transistor. A second resistor coupled between the gate of the first transistor and the low voltage supply terminal. The drain of the first transistor provides a voltage with a negative temperature coefficient equal to the sum of the forward voltage drop across the diode and the threshold voltage of the first transistor. A circuit providing a voltage with a positive temperature coefficient is coupled between the drain of the first transistor and the low voltage supply terminal and has an output terminal. The positive temperature coefficient balances said negative temperature coefficient so that the voltage at said output has a temperature coefficient of zero.

REFERENCES:
patent: 4472675 (1984-09-01), Shinomiya
patent: 4789819 (1988-12-01), Nelson
patent: 5563502 (1996-10-01), Akioka et al.
patent: 6507179 (2003-01-01), Jun et al.
patent: 6507180 (2003-01-01), Eguchi
patent: 0573240 (1993-12-01), None
patent: 2298724 (1996-09-01), None

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