Receiver circuit for detecting and waking up to a wakeup impulse sequence

A method of operating a receiver circuit, comprising:

• receiving a possible wakeup impulse sequence from a transmitter device;
• determining that the possible wakeup impulse sequence is a wakeup impulse sequence by verifying that the possible wakeup impulse sequence includes a first pulse burst that ends at an expected time;
• evaluating the wakeup impulse sequence to determine a preamble, a start frame delimiter (SFD), and an address within the wakeup impulse sequence, wherein:
• the preamble comprises a plurality of preamble symbols, and each of the plurality of preamble symbols comprises a corresponding pulse burst;
• the SFD comprises a start bit symbol;
• and
• the address comprises a plurality of address symbols modulated to represent an identification of the receiver circuit.

A wireless communication device comprising:

• a baseband processor (BBP);
• a transmitter coupled to the BBP and configured to transmit a transmitted wakeup impulse sequence to a receiver device wherein the transmitted wakeup impulse sequence comprises a preamble, a start frame delimiter (SFD), and an address, wherein:
• the preamble comprises a plurality of preamble symbols, and each of the plurality of preamble symbols comprises a pulse burst;
• the SFD comprises a start bit symbol;
• and
• the address comprises a plurality of address symbols modulated to represent an identification of the receiver device;
• and
• receive circuitry coupled to the BBP, the receive circuitry comprising:
• a main receiver circuit;
• and
• a wakeup receiver circuit, the wakeup receiver circuit configured to:
• receive a possible wakeup impulse sequence;
• determine that the possible wakeup impulse sequence is a received wakeup impulse sequence by verifying that the possible wakeup impulse sequence includes a first pulse burst that ends at an expected time;
• evaluate the received wakeup impulse sequence to determine a receive preamble, a receive SFD, and a receive address within the received wakeup impulse sequence.