Precise frequency generation for low duty cycle transceivers using a single crystal oscillator
First Claim
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1. A method for calibrating a non-crystal oscillator in a transceiver unit using a crystal controlled oscillator, comprising the steps of:
- establishing a time base based upon oscillations of the crystal controlled oscillator;
determining a number of oscillations of the crystal controlled oscillator during at least one period of the non-crystal oscillator;
calculating a frequency of the non-crystal oscillator based upon the determined number of oscillations;
changing the frequency of the non-crystal oscillator to approximately equal a target frequency responsive to the calculated frequency;
controlling operation of the transceiver unit responsive to the changed frequency of the non-crystal oscillator.
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Abstract
An apparatus and method for calibrating a non-crystal oscillator in a transceiver unit using a crystal-oscillator includes the step of establishing a time base based upon oscillations of the crystal oscillator. A comparison of the number of oscillations for the non-crystal oscillator and the crystal oscillator is made during a known time period is made. An adjustment is determined based upon the established time base and the compared number of oscillations. The transceiving of the transceiver unit is then controlled based upon this adjustment.
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Citations
13 Claims
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1. A method for calibrating a non-crystal oscillator in a transceiver unit using a crystal controlled oscillator, comprising the steps of:
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establishing a time base based upon oscillations of the crystal controlled oscillator; determining a number of oscillations of the crystal controlled oscillator during at least one period of the non-crystal oscillator; calculating a frequency of the non-crystal oscillator based upon the determined number of oscillations; changing the frequency of the non-crystal oscillator to approximately equal a target frequency responsive to the calculated frequency; controlling operation of the transceiver unit responsive to the changed frequency of the non-crystal oscillator. - View Dependent Claims (2, 3, 4)
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5. A transceiver unit, comprising:
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a first oscillator circuit for providing a first clock signal; a second oscillator circuit for providing a second clock signal; a crystal associated with the second oscillator circuit for controlling the provision of the second clock signal; a transceiver for transceiving data from the transceiving unit; and a controller configured to; establish a time base based upon oscillations of the crystal; determine a number of oscillations of the crystal controlled oscillator during at least one period of the non-crystal oscillator; calculate a frequency of the non-crystal oscillator based upon the determined number of oscillations; change the frequency of the non-crystal oscillator to approximately equal a target frequency responsive to the calculated frequency; control operation of the transceiver responsive to the changed frequency of the non-crystal oscillator. - View Dependent Claims (6, 7, 8, 9)
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10. A method for calibrating a non-crystal oscillator in a transceiver unit using a crystal controlled oscillator, comprising the steps of:
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establishing a time base based upon the oscillations of the crystal controlled oscillator; counting a number of pulses of the crystal controlled oscillator during at least one period of the non-crystal oscillator; determining an amount of time in a period of the non-crystal oscillator responsive to the counted number of pulses; and controlling operation of the transceiver unit responsive to the non-crystal oscillator operating with the period having the determined period of time.
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11. A method for calibrating a non-crystal oscillator in a transceiver unit using a crystal controlled oscillator, comprising the steps of:
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establishing a time base based upon oscillations of the crystal controlled oscillator; determining a number of oscillations of the crystal controlled oscillator during at least one period of the non-crystal oscillator; calculating a frequency of the non-crystal oscillator based upon the determined number of oscillations; changing the frequency of the non-crystal oscillator to approximately equal a target frequency responsive to the calculated frequency; controlling operation of the transceiver unit responsive to the changed frequency of the non-crystal oscillator; counting a number of pulses of the crystal controlled oscillator during at least one period of the non-crystal oscillator; determining an amount of time in a period of the non-crystal oscillator responsive to the counted number of pulses; and controlling operation of the transceiver unit responsive to the non-crystal oscillator operating with the period having the determined period of time. - View Dependent Claims (12, 13)
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Specification