OSCILLATOR DEVICES AND METHODS THEREOF
First Claim
Patent Images
1. A device, comprising:
- a current source comprising;
a first transistor comprising a first current electrode coupled to a first voltage reference, a second current electrode coupled to a second voltage reference, and a control electrode coupled to the second voltage reference;
a second transistor comprising a first current electrode coupled to the first voltage reference, a second current electrode coupled to the control electrode of the first transistor, and a control electrode coupled to the first current electrode of the first transistor; and
an output coupled to the first current electrode of the first transistor;
a switching module comprising;
a capacitor comprising a first current electrode responsive to a voltage at the output of the current source and a second current electrode coupled to the second voltage reference; and
a first control module comprising a third transistor that is matched with the first transistor, the third transistor comprising a first current electrode coupled to the first voltage reference, a second current electrode coupled to the second voltage reference, and a control electrode coupled to the first current electrode of the capacitor; and
a latch comprising a first input coupled to the first current electrode of the third transistor and a first output configured to provide a periodic signal based on a signal at the input.
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Abstract
Oscillator devices and methods of operating such oscillator devices are disclosed. The oscillator devices include a current source, and an oscillation module to provide a clock signal. The frequency of the clock signal depends on the relationship between a threshold voltage of a transistor at the oscillation module and the current level provided by the current source. The transistor at the oscillation module is matched to a transistor at the current source so that the frequency of the clock signal is relatively insensitive to changes in device temperature.
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Citations
20 Claims
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1. A device, comprising:
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a current source comprising; a first transistor comprising a first current electrode coupled to a first voltage reference, a second current electrode coupled to a second voltage reference, and a control electrode coupled to the second voltage reference; a second transistor comprising a first current electrode coupled to the first voltage reference, a second current electrode coupled to the control electrode of the first transistor, and a control electrode coupled to the first current electrode of the first transistor; and an output coupled to the first current electrode of the first transistor; a switching module comprising; a capacitor comprising a first current electrode responsive to a voltage at the output of the current source and a second current electrode coupled to the second voltage reference; and a first control module comprising a third transistor that is matched with the first transistor, the third transistor comprising a first current electrode coupled to the first voltage reference, a second current electrode coupled to the second voltage reference, and a control electrode coupled to the first current electrode of the capacitor; and a latch comprising a first input coupled to the first current electrode of the third transistor and a first output configured to provide a periodic signal based on a signal at the input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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applying a first current to charge a capacitor to a first voltage level during a first interval, the first voltage level dependent on a first threshold voltage, the first threshold voltage dependent on a first temperature; generating a first clock signal interval in response to the capacitor charge reaching the first threshold voltage; and applying a second current to charge the capacitor to a second voltage level during a second interval, the second voltage level dependent on a second threshold voltage, the second threshold voltage dependent on a second temperature, the second temperature dependent on the first temperature; and generating a second clock signal interval in response to the capacitor charge reaching the second threshold voltage, wherein the duration of the second interval is generally the same as the duration of the first interval. - View Dependent Claims (14, 15, 16)
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17. A device comprising:
an oscillator comprising a frequency variation of not greater than about 3.0 kHz over a temperature range of between about −
40°
C. and about 120°
C., at a voltage of not greater than about 5.5 Volts.- View Dependent Claims (18)
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19. A device, comprising:
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a current source generating a current dependent upon a voltage threshold of a first transistor; a switching module for providing a switch control signal for latching, the switch control signal dependent upon the relationship between a capacitor charge and a first voltage level, the first voltage level based on a voltage threshold of a second transistor, the capacitor charge is proportional to the current; and wherein a change in the voltage threshold of the first transistor due to a temperature change is generally matched by a change in the voltage threshold of the second transistor due to the temperature change. - View Dependent Claims (20)
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Specification