Low power wake-up receiver
OwnerPo-Han Wang, Haowei Jiang +2inventors
InventorsPo-Han Wang, Haowei Jiang, Drew Hall, Patrick Mercier
Life of this patent
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Abstract
A low-power wake-up receiver. The receiver includes a transformer/filter resonating at a pre-selected frequency to realize passive RF voltage gain. A pseudo-balun envelope detector is coupled to an output of the transformer filter. A comparator or other quantizer is coupled to an output of the active pseudo-balun envelope detector (ED) for comparing the ED output to a comparison threshold voltage. The pseudo-balun envelop detector can be an active detector. The pseudo-balun detector can also be a passive detector.
Claims15
A low-power wake-up receiver comprising:
- a transformer/filter resonating at a pre-selected frequency to realize passive RF voltage gain;
- a pseudo-balun envelope detector coupled to an output of the transformer filter;
- a comparator or other quantizer coupled to an output of the active pseudo-balun envelope detector (ED) for comparing the ED output to a comparison threshold voltage.
The receiver of claim 6, wherein the input transistors, load transistors and pseudo-resistors are digitally adjustable to allow biasing that accounts for process voltage and temperature variation.
A relaxation oscillator comprising a proportional to absolute temperature (PTAT) reference current generator that charges an integration capacitor Cint charged by the reference current to generate a reference voltage Vref, and a continuous-time comparator with a complementary to absolute temperature (CTAT) delay that resets the integration capacitor repeatedly after Vint crosses Vref realizing a temperature independent frequency.
Dependencies are inferred from the claim text.