Local oscillator leakage control in direct conversion processes
First Claim
1. A method of generating a local oscillator (LO) frequency in a multi-band direct conversion wireless communication device, the method comprising:
- receiving a signal, from voltage controlled oscillator (VCO), having a VCO frequency;
dividing the VCO frequency by a number N to produce a signal having a divided-down frequency; and
mixing the signal having the VCO frequency with the signal having the divided-down frequency to produce an output signal having the LO frequency.
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Abstract
A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.
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Citations
49 Claims
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1. A method of generating a local oscillator (LO) frequency in a multi-band direct conversion wireless communication device, the method comprising:
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receiving a signal, from voltage controlled oscillator (VCO), having a VCO frequency;
dividing the VCO frequency by a number N to produce a signal having a divided-down frequency; and
mixing the signal having the VCO frequency with the signal having the divided-down frequency to produce an output signal having the LO frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of generating a local oscillator (LO) frequency in a multi-band direct conversion wireless communication device, the method comprising:
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receiving a signal, from a voltage controlled oscillator (VCO), having a VCO frequency;
dividing the VCO frequency by a number N to produce a signal having a divided-down frequency;
dividing the divided-down frequency by a number M to produce a second signal having a further divided-down frequency; and
mixing the signal having the VCO frequency with the second signal having the further divided-down frequency to produce an output signal having the LO frequency. - View Dependent Claims (8, 9)
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10. A method of generating a local oscillator (LO) frequency in a multi-band direct conversion wireless communication device, the method comprising:
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configuring an LO generator to have one or more configurations, each configuration being associated with at least one frequency band of RF signals and producing an output signal whose frequency is associated with the at least one frequency band of RF signals, and to mix a VCO frequency with a divided-down version of the VCO frequency;
choosing a frequency band of RF signals; and
selecting a configuration associated with the chosen frequency band of RF signals. - View Dependent Claims (11)
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12. A system for generating a local oscillator (LO) frequency in a multi-band direct conversion wireless communication device, the system comprising:
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a voltage controlled oscillator (VCO);
a divider having an input and an output produced by dividing an input signal, the divider input being operatively coupled to the VCO; and
a mixer having a first mixer input operatively coupled to the VCO, a second mixer input operatively coupled to the divider output, and an output providing the LO frequency. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. The system for generating a local oscillator (LO) frequency in a multi-band direct conversion less communication device, the system comprising:
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a voltage controlled oscillator (VCO);
a first divider having an input and an output produced by dividing an input signal, the input of the first divider being operatively coupled to the VCO;
a second divider having an input and an output produced by dividing an input signal, the input of the second divider being operatively coupled to the output of the first divider; and
a mixer having a first mixer input operatively coupled to the output of the first divider, a second mixer input operatively coupled to the output of the second divider, and an output. - View Dependent Claims (46, 47)
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48. The system for generating a local oscillator (LO) frequency in a multi-band direct conversion wireless communication device, the system comprising:
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an LO generator having one or more configurations, each configuration being associated with at least one frequency band of RF signals and producing an output signal whose frequency is associated with the at least one frequency band of RF signals, and a mixer configured to mix a VCO frequency with a divided-down version of the VCO frequency; and
a configuration selection mechanism arranged to select a configuration associated with a chosen frequency band of RF signals. - View Dependent Claims (49)
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Specification