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US 11,336,226 B2Granted
Compensating temperature null characteristics of self-compensated oscillators
AssigneeSi-Ware Systems S.A.E.
InventorsDavid H. G. Mikhail, Ahmed Elkholy, Ahmed Helmy, Mohamed A. S. Eldin, Omar Essam El-Aassar, Nabil Sinoussi, Ahmed ElSayed, Mohamed Abd ElMoneim Bahry
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Abstract
Techniques are described that enables controlling the TNULL characteristic of a self-compensated oscillator by controlling the magnitude and direction of the frequency deviation versus temperature, and thus, compensating the frequency deviation.
Claims22
An oscillator circuit comprising:
- an oscillator comprising:
- one or more frequency determining tank circuits;
- and
- one or more amplifiers coupled to the one or more tank circuits;
- circuitry for causing a phase shift between voltage and current of the one or more tank circuits, for causing the oscillator to operate at a temperature null operating point of reduced frequency variation over a temperature null temperature range, in accordance with a temperature null characteristic;
- one or more output buffers coupled to the oscillator;
- and
- a temperature compensation circuit comprising a temperature sensor and a control circuit coupled to the temperature sensor for generating one or more compensation signals, the one or more compensation signals being generated so as to counteract temperature-dependent frequency variations of the temperature null characteristic and being applied to the oscillator for reducing temperature variations over frequency at least within the temperature null temperature range;
- wherein the oscillator circuit is configured to generate the one or more compensation signals during normal operation, distinct from calibration, and to vary the one or more compensation signals in response to temperature sensed using the temperature sensor during normal operation;
- and
- wherein the oscillator circuit, in addition to operating as a self-compensated oscillator, operates also as a temperature-compensated oscillator.
8 more elements
A method of producing a temperature-compensated oscillator signal, comprising:
- operating an oscillator at a temperature null operating point of reduced frequency variation over a temperature null temperature range, in accordance with a temperature null characteristic;
- sensing temperature using a temperature sensor;
- generating one or more temperature-dependent compensation signals so as to counteract temperature-dependent frequency variations of the temperature null characteristic;
- and
- applying the one or more compensation signals to the oscillator for reducing temperature variations over frequency at least within the temperature null temperature range;
- wherein the oscillator circuit is configured to generate the one or more compensation signals during normal operation, distinct from calibration, and to vary the one or more compensation signals in response to temperature sensed using the temperature sensor during normal operation;
- and
- wherein the oscillator, in addition to operating as a self-compensated oscillator, operates also as a temperature-compensated oscillator.
5 more elements
A method of controlling an oscillator comprising a phase shift network and a temperature compensation circuit comprising a temperature sensor, the method comprising:
- using the phase shift network to cause the oscillator to operate at a temperature null at which variations of frequency as a result of variations in temperature are reduced, the oscillator operating as a self-compensated oscillator;
- and
- at least within a region of operation about the temperature null, using the temperature compensation circuit to counteract expected frequency variations in accordance with temperature readings from the temperature sensor;
- wherein the oscillator generates one or more compensation signals during normal operation, distinct from calibration, and varies the one or more compensation signals in response to temperature sensed using the temperature sensor during normal operation;
- wherein the oscillator, in addition to operating as a self-compensated oscillator, operates also as a temperature-compensated oscillator.
2 more elements
An oscillator circuit comprising:
- a phase shift network;
- and
- a temperature compensation circuit comprising a temperature sensor;
- wherein the oscillator circuit is configured to:
- use the phase shift network to cause the oscillator circuit to operate at a temperature null at which variations of frequency as a result of variations in temperature are reduced, the oscillator circuit operating as a self-compensated oscillator;
- and
- at least within a region of operation about the temperature null, the temperature compensation circuit being configured to counteract expected frequency variations in accordance with temperature readings from the temperature sensor;
- wherein the oscillator circuit is configured to generate one or more compensation signals during normal operation, distinct from calibration, and to vary the one or more compensation signals in response to temperature sensed using the temperature sensor during normal operation;
- and
- wherein the oscillator circuit is configured to, in addition to operating as a self-compensated oscillator, operate also as a temperature-compensated oscillator.
7 more elements
Dependencies are inferred from the claim text.