US 6,958,597 B1 · Voltage generating apparatus with a fine-tune current module · patentgrep

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Abstract

Voltage generating apparatus includes a positive temperature coefficient current generating module, a negative temperature coefficient current generating module, a fine-tune current module and a voltage output module. The function of the positive temperature coefficient current generating module and the negative temperature coefficient current generating module, which take advantage of characteristics of MOS devices operated in the sub-threshold region, is to generate a stable current of positive temperature coefficient and a stable current of negative temperature coefficient, respectively. The current fine-tune module increases or decreases output current of the negative temperature coefficient current generating module. The voltage output module sums two output currents of the positive temperature coefficient current generating module and the negative temperature coefficient current generating module and transforms the total current into output voltage that is stable under temperature and process variation.

Claims16

Dependent claims

A voltage generator, comprising:

a positive temperature coefficient current generating module, wherein an output current of the positive temperature coefficient current generating module increases with a rising ambient temperature;
a negative temperature coefficient current generating module wherein an output current of the negative temperature coefficient current generating module decreases with a rising ambient temperature;
a current fine-tune module used for adjusting the output current of the negative temperature coefficient current generating module;
and
a voltage output module, connected to the positive temperature coefficient current generating module and the negative temperature coefficient current generating module for generating an output voltage according to the positive temperature coefficient current generating module and the negative temperature coefficient current generating module.

2 more elements

A voltage generator, comprising:

a positive temperature coefficient current generating circuit, which comprises a first NMOS device, a second NMOS device, a resistor, and a current mirror, a gate of the first NMOS device being connected to a drain of the first NMOS device and a gate of the second NMOS device, a source of the first NMOS device being connected to ground, a source of the second NMOS device being connected to ground through the resistor, the drain of the first NMOS device and a drain of the second NMOS device being connected to the current mirror, the current mirror being used for mirroring a current through the resistor generating an output current;
a negative temperature coefficient current generating circuit comprising a first NMOS device, a second NMOS device, a resistor, and a current mirror, a gate of the first NMOS device being connected to ground through the resistor, a source of the first NMOS device being connected to ground, a drain of the first NMOS device being connected to the current mirror of the positive temperature coefficient current generating module, a source of the second NMOS device being connected to the gate of the first NMOS device, a gate of the second NMOS device being connected to the drain of the first NMOS device, a drain of the second NMOS device being connected to the current mirror of the negative temperature coefficient current generating module for mirroring a current through the second NMOS device to generate an output current;
and
a voltage outputting circuit, connected to the positive and the negative temperature coefficient current generating circuits for generating an output voltage according to the output currents of the positive and the negative temperature coefficient current generating circuits.

1 more element

A voltage generator, comprising:

a positive temperature coefficient current generating circuit comprising a first PMOS device, a second PMOS device, a resistor and a current mirror, a gate of the first PMOS device is connected to a drain of the first PMOS device and a gate of the second PMOS device, a source of the first PMOS device is connected to a power supply, the source of the second PMOS device being connected to the power supply through the resistor, the drains of the first and the second PMOS devices being connected to the current mirror, the current mirror being used for mirroring a current through the resistor generating an output current;
a negative temperature coefficient current generating circuit comprising a first PMOS device, a second PMOS device, a resistor, and a current mirror, a gate of the first PMOS device being connected to the power supply through the resistor, a source of the first PMOS device being connected to the power supply, a drain of the first PMOS device being connected to the current mirror of the positive temperature coefficient current generating module, a source of the second PMOS device being connected to the gate of the first PMOS device, a gate of the second PMOS device being connected to the drain of the first PMOS device, a drain of the second PMOS device being connected to the current mirror of the negative temperature coefficient current generating module for mirroring a current through the second PMOS device to generate an output current;
and
a voltage outputting circuit, connected to the positive and the negative temperature coefficient current generating circuits for generating an output voltage according to the output currents of the positive and the negative temperature coefficient current generating circuits.

1 more element

A voltage generator, comprising:

a positive temperature coefficient current generating circuit comprising a first PMOS device, a second PMOS device, a resistor and a current mirror, a gate of the first PMOS device is connected to a drain of the first PMOS device and a gate of the second PMOS device, a source of the first PMOS device is connected to a power supply, the source of the second PMOS device being connected to the power supply through the resistor, the drains of the first and the second PMOS devices being connected to the current mirror, the current mirror being used for mirror a current through the resistor generating an output current;
a negative temperature coefficient current generating circuit comprising a first NMOS device, a second NMOS device, a resistor, and a current mirror, a gate of the first NMOS device being connected to ground through the resistor, a source of the first NMOS device being connected to ground, a drain of the first NMOS device being connected to the current mirror of the positive temperature coefficient current generating module, a source of the second NMOS device being connected to the gate of the first NMOS device, a gate of the second NMOS device being connected to the drain of the first NMOS device, a drain of the second NMOS device being connected to the current mirror of the negative temperature coefficient current generating module for mirroring a current through the second NMOS device to generate an output current;
and
a voltage outputting circuit, connected to the positive and the negative temperature coefficient current generating circuits for generating an output voltage according to the output currents of the positive and the negative temperature coefficient current generating circuits.

1 more element

A voltage generator, comprising:

a positive temperature coefficient current generating circuit, which comprises a first NMOS device, a second NMOS device, a resistor, and a current mirror, a gate of the first NMOS device being connected to a drain of the first NMOS device and a gate of the second NMOS device, a source of the first NMOS device being connected to ground, a source of the second NMOS device being connected to ground through the resistor, the drain of the first NMOS device and a drain of the second NMOS device being connected to the current mirror, the current mirror being used for mirror a current through the resistor generating an output current;
a negative temperature coefficient current generating circuit comprising a first PMOS device, a second PMOS device, a resistor, and a current mirror, a gate of the first PMOS device being connected to the power supply through the resistor, a source of the first PMOS device being connected to the power supply, a drain of the first PMOS device being connected to the current mirror of the positive temperature coefficient current generating module, a source of the second PMOS device being connected to the gate of the first PMOS device, a gate of the second PMOS device being connected to the drain of the first PMOS device, a drain of the second PMOS device being connected to the current mirror of the negative temperature coefficient current generating module for mirroring a current through the second PMOS device to generate an output current;
and
a voltage outputting circuit, connected to the positive and the negative temperature coefficient current generating circuits for generating an output voltage according to the output currents of the positive and the negative temperature coefficient current generating circuits.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/709,470Filed 7 May 2004
Published: US 2005/0248330 A110 Nov 2005
Granted: 25 Oct 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G05F 3/262
Current mirrors: using field-effect transistors only
G05F 3/30
Using diode- transistor combinations: regulators using the difference between the base-emitter voltages of two bipolar transistors operating at…
Y10S 323/907
Electricity: power supply or regulation systems: temperature compensation of semiconductor
G05F
Systems for regulating electric or magnetic variables

Family

US 2005/0248330 A1Published application
US 6,958,597 B1This patent

From the US filing history. Foreign family members aren’t listed.

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