Oscillator Circuit and Semiconductor Device Using the Oscillator Circuit
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsKazunori Watanabe, Yoshiaki Ito
Life of this patent
Estimating the term…
Abstract
The oscillator circuit includes a comparator circuit which compares a potential supplied to one of input terminals with a potential supplied to the other of the input terminals and outputs a high power supply potential or a low power supply potential, a capacitor which is electrically connected to the one of the input terminals of the comparator circuit, and a charge and discharge circuit which charges and discharges the capacitor. The charge and discharge circuit includes a first current supply circuit and a second current supply circuit. Each of a current value of the first current supply circuit and a current value of the second current supply circuit can be controlled with the use of a digital control signal.
Claims26
An oscillator circuit comprising:
- a comparator circuit;
- a capacitor, wherein one of terminals of the capacitor is electrically connected to one of input terminals of the comparator circuit;
- a charge and discharge circuit electrically connected to the one of terminals of the capacitor;
- and
- a wiring electrically connected to the other of the input terminals of the comparator circuit, wherein the wiring is supplied with a reference potential,
- wherein the charge and discharge circuit comprises:
- a first current supply circuit;
- a second current supply circuit;
- and
- a switching circuit which is provided between the first current supply circuit and the capacitor and between the second current supply circuit and the capacitor,
- wherein an output terminal of the comparator circuit is electrically connected to the switching circuit,
- wherein a digital control signal for controlling a current value is supplied to the first current supply circuit and the second current supply circuit.
An oscillator circuit comprising:
- a comparator circuit configured to compare a potential supplied to one of input terminals with a potential supplied to the other of the input terminals and to output a high power supply potential or a low power supply potential;
- a capacitor electrically connected to the one of the input terminals of the comparator circuit;
- a charge and discharge circuit configured to charge and discharge the capacitor;
- and
- a wiring supplied with a reference potential and electrically connected to the other of the input terminals of the comparator circuit,
- wherein the charge and discharge circuit comprises:
- a first current supply circuit configured to generate a current with a first current value;
- a second current supply circuit configured to generate a current with a second current value;
- and
- a switching circuit which is provided between the first current supply circuit and the capacitor and between the second current supply circuit and the capacitor,
- wherein the switching circuit is configured to connect the capacitor to any one of the first current supply circuit and the second current supply circuit electrically in accordance with an output potential of the comparator circuit,
- wherein the first current value and the second current value are controlled with the use of a digital control signal supplied to the first current supply circuit and the second current supply circuit.
An oscillator circuit comprising:
- a comparator circuit configured to compare a potential supplied to one of input terminals with a potential supplied to the other of the input terminals and to output a high power supply potential or a low power supply potential;
- a capacitor electrically connected to the one of the input terminals of the comparator circuit;
- a charge and discharge circuit configured to charge and discharge the capacitor;
- and
- a wiring supplied with a reference potential and electrically connected to the other of the input terminals of the comparator circuit,
- wherein the charge and discharge circuit comprises:
- a first current supply circuit configured to generate a current with a first current value;
- a second current supply circuit configured to generate a current with a second current value;
- a first switch which is provided between the first current supply circuit and the capacitor;
- and
- a second switch which is provided between the second current supply circuit and the capacitor,
- wherein an output terminal of the comparator circuit is electrically connected to each of the first switch and the second switch,
- wherein the first current value and the second current value are controlled with the use of a digital control signal supplied to the first current supply circuit and the second current supply circuit.
Dependencies are inferred from the claim text.