Methods and systems for interference rejection for low signals
First Claim
1. A radio device, comprising:
- a non-heterodyne receiver, configured to receive a signal waveform and to provide a wake-up signal to a second communication circuit when the signal waveform is a valid communication request;
whereinthe second communication circuit switches from a power saving state to an operating state upon receiving the wake-up signal from the non-heterodyne receiver;
the non-heterodyne receiver further comprising an Electromagnetic interference (EMI) rejection circuit including a narrow band filter and a broadband filter to reject an EMI signal.
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Accused Products
Abstract
A radio device and a method to operate a non-heterodyne receiver are provided. The radio device is configured to receive a signal waveform and to provide a wake-up signal to a second communication circuit when the signal waveform is a valid communication request; wherein the second communication circuit switches from a power saving state to an operating state upon receiving the wake-up signal from the non-heterodyne receiver. The non-heterodyne receiver further including an Electromagnetic interference (EMI) rejection circuit, including a narrow band filter and a broadband filter to reject an EMI signal. A filter circuit for a narrow passband circuit is also provided. The filter including a buffer circuit; a crystal oscillator coupled to the output of the buffer circuit; and an inverting amplifier coupled in parallel to the crystal oscillator.
36 Citations
20 Claims
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1. A radio device, comprising:
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a non-heterodyne receiver, configured to receive a signal waveform and to provide a wake-up signal to a second communication circuit when the signal waveform is a valid communication request;
whereinthe second communication circuit switches from a power saving state to an operating state upon receiving the wake-up signal from the non-heterodyne receiver; the non-heterodyne receiver further comprising an Electromagnetic interference (EMI) rejection circuit including a narrow band filter and a broadband filter to reject an EMI signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method to operate a radio device, comprising:
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turning ‘
on’
a first receiver for a period of time;receiving a signal waveform in the first receiver; detecting a first signal level from the signal waveform using a narrow band filter; detecting a second signal level from the signal waveform using a broad band filter; comparing the first signal level and the second signal level to determine if the signal waveform is a valid communication request or an electromagnetic interference (EMI); when the signal waveform is a valid communication request, turning ‘
on’
a second circuit;when the signal waveform is EMI, maintaining the second circuit in a sleep mode; turning ‘
off’
the first receiver after the period of time lapses. - View Dependent Claims (18, 19, 20)
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Specification