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US 6,320,458 B1Granted
Integrated structure with an analog unit supplied by an external supply voltage by means of a low-pass filter and driving elements
AssigneeSTMicroelectronics S.r.l.
InventorsPaolo Cusinato, Gabriele Gandolfi, Vittorio Colonna, Davide Tonietto
Life of this patent
Estimating the term…
Abstract
An integrated circuit has a first external supply terminal and a second external supply terminal for applying an external supply voltage to the circuit. The integrated circuit includes an analog unit supplied by at least one internal supply voltage derived from the external supply voltage, a low-pass filter connected to the first external supply terminal and to the second external supply terminal, and a driver connected between the low-pass filter and the analog unit for supplying the at least one internal supply voltage.
Claims28
A circuit comprising:
- an integrated structure including
- a first external supply terminal and a second external supply terminal for applying an external supply voltage,
- an analog unit supplied by at least one internal supply voltage derived from the external supply voltage,
- a low-pass filter connected to the first external supply terminal and to the second external supply terminal, and comprising a first capacitive element,
- a control terminal connected to the first capacitive element of the low pass filter, and
- a driving circuit connected between the low-pass filter and the analog unit for supplying the at least one internal supply voltage, the driving circuit comprising at least one filtering capacitive element for filtering the at least one internal supply voltage;
- and
- an external capacitive element external to the integrated structure and connected to the control terminal, the external capacitive element having a higher capacitance than a capacitance of the first capacitive element of the low pass filter.
5 more elements
A circuit comprising:
- an integrated structure including
- a first external supply terminal and a second external supply terminal for applying an external supply voltage,
- a low-pass filter connected to the first external supply terminal and to the second external supply terminal, and comprising a first capacitive element,
- a control terminal connected to the first capacitive element of the low pass filter,
- a driving circuit connected to the low-pass filter for generating at least one internal supply voltage based upon the external supply voltage, the driving circuit comprising at least one filtering capacitive element for filtering the at least one internal supply voltage, and
- an analog unit connected to the driving circuit and receiving the at least one internal supply voltage;
- and
- an external capacitive element external to the integrated structure and connected to the control terminal, the external capacitive element having a higher capacitance than a capacitance of the first capacitive element of the low pass filter.
5 more elements
A circuit comprising:
- an integrated structure including
- a first external supply terminal and a second external supply terminal for applying an external supply voltage,
- a low-pass filter connected to the first external supply terminal and to the second external supply terminal, and comprising a first capacitive element,
- a control terminal connected to the first capacitive element of the low pass filter,
- a driving circuit connected to the low-pass filter for generating at least one internal supply voltage based upon the external supply voltage, the driving circuit comprising at least one filtering capacitive element for filtering the at least one internal supply voltage,
- a digital unit supplied by the external supply voltage, and
- a phase-locked loop comprising a voltage-controlled oscillator connected to the driving circuit and receiving the at least one internal supply voltage for generating an internal clock signal for the digital unit based upon an external clock signal;
- and
- an external capacitive element external to the integrated structure and connected to the control terminal, the external capacitive element having a higher capacitance than a capacitance of the first capacitive element of the low pass filter.
6 more elements
A method of supplying an analog unit of an integrated circuit with an internal supply voltage, the method comprising:
- applying an external supply voltage to the integrated circuit;
- filtering the external supply voltage via a low-pass filter having a first capacitive element and a control terminal connected thereto;
- connecting an external capacitive element, external to the integrated circuit, to the control terminal, the external capacitive element having a higher capacitance than a capacitance of the first capacitive element of the low-pass filter to reduce a cut-off frequency thereof;
- generating at least one internal supply voltage, based upon the external supply voltage, via a driving circuit connected to the low-pass filter, the driving circuit including at least one filtering capacitive element for filtering the at least one internal supply voltage;
- and
- supplying the analog unit with the at least one internal supply voltage.
3 more elements
Dependencies are inferred from the claim text.