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US 6,642,776 B1Granted
Bandgap voltage reference circuit
AssigneeSTMicroelectronics S.r.l.
InventorsRino Micheloni, Luca Crippa
Life of this patent
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AssigneeSTMicroelectronics S.r.l.
InventorsRino Micheloni, Luca Crippa
Estimating the term…
Bandgap voltage reference circuit with an output voltage that remains stable in the range of a temperature of utilization. The circuit includes a first circuit block, a second circuit block, and a control circuit connected with said circuit blocks, said first circuit block including a bandgap circuit with a low power consumption, said second circuit block including a bandgap circuit with a short start up time, said control circuit suitable to control said two circuit blocks in a such way that said output voltage of said bandgap voltage reference circuit is supplied by said second circuit block at the starting of said first circuit block for a period of time and said output voltage is supplied by said first circuit block for the period of time subsequent to said period of time and that lasts until the turning off of the circuit, said second circuit block being turned off after said period of time.
Bandgap voltage reference circuit with an output voltage that remains stable in the range of a temperature of utilization comprising a first circuit block, a second circuit block, and a control circuit connected with said circuit blocks, said first circuit block comprising a bandgap, circuit with a low power consumption, said second circuit block comprising a bandgap circuit with a short start up time, said control circuit to control said two circuit blocks such that said output voltage of said bandgap voltage reference circuit is supplied by said second circuit block at the starting of said bandgap voltage reference circuit for a first period of time and said output voltage is supplied by said first circuit block for the period of time subsequent to said first period of time and that lasts until the turning off of said bandgap voltage reference circuit, said bandgap voltage reference circuit further comprising a first switch to turn off said second circuit block after said first period of time.
A bandgap voltage reference circuit comprising a first bandgap circuit, a second bandgap circuit having a power consumption lower than a power consumption of the first bandgap circuit, and a control circuit connected to the first bandgap circuit and the second bandgap circuit, wherein the control circuit selects the first bandgap circuit to supply an output voltage of the bandgap voltage reference circuit for a first period of time and the control circuit selects the second bandgap circuit to supply the output voltage of the bandgap voltage reference circuit for a second period of time subsequent to the first period of time, and wherein the bandgap voltage reference circuit further comprises a switch that, responsive to a control signal, turns off the first bandgap circuit after the first period of time.
A bandgap voltage reference circuit comprising a first bandgap circuit, a second bandgap circuit having a startup time shorter than a startup time of the first bandgap circuit, and a control circuit connected to the first bandgap circuit and the second bandgap circuit, wherein the control circuit selects the second bandgap circuit to supply an output voltage of the bandgap voltage reference circuit for a first period of time and the control circuit selects the first bandgap circuit to supply the output voltage of the bandgap voltage reference circuit for a second period of time subsequent to the first period of time, and wherein the bandgap voltage reference circuit further comprises a switch that, responsive to a control signal, turns off the second bandgap circuit after the first period of time.
A method for generating, with a short start up time and low power consumption, a bandgap reference voltage, the method comprising acts of:
Dependencies are inferred from the claim text.