Signal generator and calibrating method thereof
AssigneeMediatek Inc.
InventorsYi-Feng Chen, Tsung-Ying Tsai, Heng-Meng Liu, Sung-Yun Hsueh
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Abstract
A signal generator includes a main ring oscillator and a first ring oscillator. The main ring oscillator is supplied by a power voltage, and is configured to generate an output oscillation signal. The main ring oscillator is coupled through a power mesh to the power voltage. The first ring oscillator is supplied by the power voltage. The first ring oscillator is similar or identical to the main ring oscillator. The first ring oscillator is coupled through the power mesh to the power voltage. The first ring oscillator is used to calibrate a frequency of the output oscillation signal.
Claims22
A signal generator, comprising:
- a main ring oscillator, supplied by a power voltage, and configured to generate an output oscillation signal, wherein the main ring oscillator is coupled through a power mesh to the power voltage;
- a first ring oscillator, supplied by the power voltage, wherein the first ring oscillator is similar or identical to the main ring oscillator, and wherein the first ring oscillator is coupled through the power mesh to the power voltage;
- and
- a second ring oscillator, supplied by the power voltage, wherein the second ring oscillator is similar or identical to the main ring oscillator, and wherein the second ring oscillator is coupled through the power mesh to the power voltage;
- wherein the first ring oscillator is used to calibrate a frequency of the output oscillation signal;
- wherein the second ring oscillator is used to calibrate the frequency of the main ring oscillator.
A method for calibrating a signal generator, comprising the steps of:
- providing a main ring oscillator which is supplied by a power voltage, wherein the main ring oscillator is configured to generate an output oscillation signal, and wherein the main ring oscillator is coupled through a power mesh to the power voltage;
- providing a first ring oscillator which is supplied by the power voltage, wherein the first ring oscillator is similar or identical to the main ring oscillator, and wherein the first ring oscillator is coupled through the power mesh to the power voltage;
- providing a second ring oscillator which is supplied by the power voltage, wherein the second ring oscillator is similar or identical to the main ring oscillator, and wherein the second ring oscillator is coupled through the power mesh to the power voltage;
- using the first ring oscillator to calibrate a frequency of the output oscillation signal;
- and
- using the second ring oscillator to calibrate the frequency of the main ring oscillator.
Dependencies are inferred from the claim text.