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US 2021/0282088 A1Published application
Low power wake on radio
AssigneeSilicon Laboratories Inc.
InventorsPio Balmelli, Praveen Vangala, John M. Khoury
Life of this patent
Estimating the term…
Abstract
A low power wake on radio circuit detects if an RF signal is present on an input to the wake on radio circuit. An RF sense circuit supplies an RF sense signal indicating whether the RF signal is present on the input. The RF sense signal is used to incrementally turn on digital decode logic to determine if a radio transmission that is unique to the wake on radio circuit has been received. If the unique radio transmission have been received, the wake on radio circuit supplies a wakeup signal to the rest of the system.
Claims20
A method comprising:
- detecting if a radio frequency (RF) signal is present on an input to a wake on radio circuit;
- supplying a plurality of detection indications over a signal line from an analog portion of the wake on radio circuit to a digital portion, each of the detection indications having a first value to indicate that the RF signal was detected on the input and having a second value to indicate that the RF signal was not detected on the input;
- and
- based on the detection indications, incrementally enabling decode logic to decode a radio transmission selective to the wake on radio circuit has been received.
1 more element
An apparatus comprising:
- an analog portion of a wake on radio circuit including,
- an input transistor having a gate coupled to an input to the wake on radio circuit to detect if there is a radio frequency (RF) signal present on the input;
- a comparator having a first comparator input coupled to a drain of the input transistor in an operational mode and having a second comparator input coupled to a reference voltage in the operational mode, the comparator to supply a comparison indication on a comparator output indicating whether the RF signal was detected on the input;
- and
- a digital portion of the wake on radio circuit coupled to the comparator output, wherein the digital portion is configured to incrementally enable decode logic to decode whether a radio transmission selective to the wake on radio circuit has been received based on a plurality of the comparison indications supplied on the comparator output.
2 more elements
An apparatus comprising:
- an analog portion of a wake on radio circuit to detect if there is a radio frequency (RF) signal present on an input to the wake on radio circuit and to supply an indication on a signal line indicating whether the RF signal was present;
- a digital portion of the wake on radio circuit coupled to the signal line, the digital portion including,
- first high symbol detect logic coupled to the signal line to determine if a first high symbol was received;
- first preamble bit detect logic circuit, wherein responsive to detecting the first high symbol, the first preamble bit detect logic circuit is enabled and used to detect a first bit of a preamble that includes the first high symbol;
- preamble detect logic to detect the preamble, the preamble detect logic being enabled responsive to detection of the first bit of the preamble;
- identification sequence detection logic to detect an identification sequence unique to the wake on radio circuit, the identification sequence detection logic being enabled responsive to detection of the preamble;
- and
- wherein responsive to detecting the identification sequence, the digital portion generates a wakeup signal to wake up circuitry kept in a low power state until the identification sequence unique to the wake on radio circuit, is detected.
5 more elements
Dependencies are inferred from the claim text.