Frequency offset of a clock signal
AssigneeSTMicroelectronics International N.V.
InventorsCao-Thong Tu, David Cousinard, David Champion, Matteo Contaldo
Life of this patent
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Abstract
An electronic device applies a frequency offset function to a first signal having a first frequency. The device includes a delay element configured to output a second signal corresponding to the first signal delayed by a duration equal to a first period of said signal divided by four. A circuit branch includes a first circuit configured to divide the frequency of the first signal by a given number coupled in series with a second circuit configured to implement an integration. The circuit branch outputs a third signal and a fourth signal. A single side band mixing circuit processes the first signal, second signal, third signal and fourth signal to generate an output signal.
Claims22
An electronic device configured to apply a frequency offset function to a first signal having a first frequency, comprising:
- a delay element configured to output a second signal corresponding to the first signal offset by a duration equal to a first period of said first signal divided by four;
- a circuit branch including a first circuit configured to divide the frequency of the first signal by a dividing number and coupled to a second circuit configured to integrate an output of the first circuit, wherein said circuit branch is configured to output a third signal and a fourth signal;
- and
- a third circuit configured to perform a single side band mixing to combine the first signal, the second signal, the third signal and the fourth signal to output a fifth signal.
A method for applying a frequency offset function to a first signal having a first frequency, comprising:
- generating a second signal corresponding to the first signal offset by a duration equal to a first period of said first signal divided by four;
- dividing the frequency of the first signal by a dividing number and then integrating the divided first signal to output a third signal and a fourth signal;
- and
- performing a single side band mixing to combine the first signal, the second signal, the third signal and the fourth signal to output a fifth signal.
Dependencies are inferred from the claim text.