Spur mitigation in a heterodyne upconversion system
AssigneeAnokiwave, Inc.
InventorsRobert Ian Gresham, Shmuel Ravid, Kristian N. Madsen, Tissana T. Kijsanayotin
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Abstract
Exemplary embodiments dynamically select the LO frequency and mixer mode (i.e., low-side LO injection or high-side LO injection) for upconversion based on the desired RF output frequency in order to mitigate the effects of spurious and LO leakage signals that could violate radiation emission limits, e.g., in the case where the IF signal frequency is smaller than the RF operating band. By dynamically switching the LO frequency and mixer mode as a function of the requested operating RF channel, low-level emissions and spurious signal compliance with restricted bands can be achieved.
Claims20
A mixing system capable of upconverting an input signal of around 3 GHz to a desired output frequency in the n258 band within acceptable EESS band interference limits, the mixing system comprising:
- a programmable local oscillator (LO) signal generator for producing an LO signal having a selected LO frequency;
- a dual-mode upconversion circuit that is dynamically switchable between a low-side LO injection mode and a high-side LO injection mode;
- and
- a controller configured to dynamically program the LO signal generator and the dual-mode upconversion circuit LO injection mode based on a desired upconversion output frequency within the n258 band wherein the LO frequency and the LO injection mode are specifically configured such that LO leakage from combining the LO signal and the input signal falls outside of the EESS band.
A dual mode mixer for converting between an n258 band signal and an intermediate frequency (IF) signal of around 3 GHz within acceptable EESS band interference limits, the dual mode mixer comprising:
- a programmable local oscillator (LO) signal generator for producing an LO signal having a selected LO frequency;
- a dual-mode mixer circuit that is dynamically switchable between a low-side LO injection mode and a high-side LO injection mode to convert between the n258 band signal and the IF signal based on the LO signal;
- and
- a controller configured to dynamically program the LO signal generator and the dual-mode mixer circuit LO injection mode based on the n258 band signal wherein the LO frequency and the LO injection mode are specifically configured such that LO leakage from the dual-mode mixer circuit falls outside of the EESS band.
A method for converting between an n258 band signal and an intermediate frequency (IF) signal of around 3 GHz within acceptable EESS band interference limits, the method comprising:
- programming a programmable local oscillator (LO) signal generator to produce an LO signal having a selected LO frequency;
- and
- programming a dual-mode mixer circuit that is dynamically switchable between a low-side LO injection mode and a high-side LO injection mode to convert between the n258 band signal and the IF signal based on the LO signal, wherein the LO frequency and the LO injection mode are specifically programmed such that LO leakage from the dual-mode mixer circuit falls outside of the EESS band.
Dependencies are inferred from the claim text.