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US 10,884,449 B2Granted
Wideband LO signal generation
AssigneeQUALCOMM Incorporated
InventorsAlireza Khalili, Mohammad Emadi, Shahram Abdollahi-Alibeik, Ali Mostajeran
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Abstract
An LO clock signal generator includes a fundamental mixer for mixing a source clock signal with a divided version of the source clock signal. The LO clock signal generator also includes a harmonic mixer for mixing the source clock signal with a third harmonic of a divided version of the source clock signal.
Claims22
A local oscillator (LO) clock signal generator, comprising:
- a clock source for sourcing a source clock signal;
- a first divider configured to divide the source clock signal in frequency into a divided source clock signal;
- a first mixer configured to mix the source clock signal with the divided source clock signal to form a first up-converted clock signal;
- a second mixer configured to mix the source clock signal with a third harmonic of the divided source clock signal to form a second up-converted clock signal;
- a second divider configured to divide the second up-converted clock signal in frequency to form a third up-converted clock signal;
- and
- an LO distribution network configured to divide the first up-converted clock signal in frequency to form a first LO output clock signal and to divide the third up-converted clock signal in frequency to form a second LO output clock signal.
4 more elements
An LO clock signal generation method, comprising:
- during a first mode of operation:
- dividing a source clock signal in frequency to form a divided source clock signal;
- mixing the source clock signal with the divided source clock signal to form a first up-converted clock signal;
- and
- dividing the first up-converted clock signal in frequency to form a first local oscillator output clock signal;
- during a second mode of operation:
- mixing the source clock signal with a third harmonic of the divided source clock signal to form a second up-converted clock signal;
- dividing the second up-converted clock signal in frequency to form a third up-converted clock signal;
- and
- dividing the third up-converted clock signal in frequency to form a second local oscillator output clock signal.
7 more elements
An LO clock signal generator, comprising:
- first means for frequency shifting a source clock signal into a first up-converted clock signal having a frequency that is one and one-half times larger than a source frequency for the source clock signal;
- second means for frequency shifting the source clock signal into a second up-converted clock signal having a frequency that is two and one-half times larger than the source frequency;
- a divide-by-two divider configured to divide the second up-converted clock signal into a third up-converted clock signal having a frequency that is one and one-fourth times larger than the source frequency;
- and
- an LO distribution network configured to divide the first up-converted clock signal into a first LO output clock signal having a frequency that is three-fourths of the source frequency, the LO distribution network being further configured to divide the third up-converted clock signal into a second LO output clock signal having a frequency that is five-eighths the source frequency.
2 more elements
Dependencies are inferred from the claim text.