Apple Inc.
SENSOR CIRCUIT WITH LEAKAGE-BASED LOCAL OSCILLATOR GENERATION

Abstract:

A sensor circuit included in a computer system may include multiple antennae and transceiver circuits that include transmitter and receiver circuits. A particular transceiver circuit may transmit, via a particular antenna, a transmit signal that is a modulated version of a baseband signal, and generate a leakage signal based on leakage between transmitter and receiver circuits included in the particular transceiver circuit. A different transceiver circuit may generate a received signal using a reflected version of the transmitted signal that is received via a different antenna. An output signal may be generated using the received and leakage signals.