摘要:
A wireless device includes an RF interface, logic circuitry, power circuitry, an impedance matching transformer, and a transducer. The RF interface is configured to receive an RF signal and provide an output data signal derived from the RF signal. The logic circuitry is configured to receive the output data signal and provide an output analog signal. The power circuitry is coupled to the RF interface and configured to provide DC operating power derived from the RF signal to the RF interface and the logic circuitry. The impedance matching transformer has an input coupled to the logic circuitry and an output. The transducer is coupled to the output of the impedance matching transformer and is configured to produce an audio signal based on the output analog signal.
摘要:
A power measurement device in accordance with aspects of the invention comprises a power harvesting unit that extracts a fraction of current flowing through an electric power supply unit to an electronic appliance; a power determination circuit that generates power measurement data indicative of at least one of the extracted current or a power consumed by the electronic appliance determined based on the extracted current; and an output device that outputs the power measurement data. The power measurement device can be used with plugs or sockets as an external component or integrated therein as an internal component.
摘要:
Systems and methods for inventory round slot classification are described. The method includes transmitting, to zero or more RFID tags, a message during a slot of an inventory round and receiving a response from at least some of the zero or more RFID tags. The method also includes analyzing a received response for the presence of the pilot tone and classifying a respective slot in response to the analysis.
摘要:
An electromagnetic field sensor or generator employing a radio frequency microstrip transmission channel formed by a low-loss dielectric substrate sandwiched between a non-resonant microstrip conductor. A discontinuity in said microstrip conductor that substantially alters its cross-sectional dimensions causes electrical signals in the microstrip conductor to be inductively coupled to near field electromagnetic radiation in the vicinity of the discontinuity. The discontinuity may be defined by one or more holes, slots, slits or stubs in the microstrip. The sensor/generator may be used in numerous applications, including NMR spectrometry, as a near field scanning device to inspect operating integrated circuits, or to read or write data on magnetic materials.
摘要:
In one embodiment, a method includes accessing at least two determinations of the location of a mobile computing device, with each determined location having been determined without reference to explicit location information manually input by a user of the mobile computing device. At least one first determined location is compared with at least one second determined location, with comparisons being made between location determinations made based on different location determination input. A functionality associated with the mobile computing device is allowed if the first determined location corresponds to at least one of the second determined locations.
摘要:
A power measurement device in accordance with aspects of the invention comprises a power harvesting unit that extracts a fraction of current flowing through an electric power supply unit to an electronic appliance; a power determination circuit that generates power measurement data indicative of at least one of the extracted current or a power consumed by the electronic appliance determined based on the extracted current; and an output device that outputs the power measurement data. The power measurement device can be used with plugs or sockets as an external component or integrated therein as an internal component.
摘要:
An Integrated Circuit (IC) for an RFID tag includes two electrically isolated antenna ports for connecting to two antennas, with each antenna port configured to operate at a different frequency range and/or with a different communications protocol. In some embodiments a rectifier coupled to one of the antenna ports is operable to extract energy from an electromagnetic field in a first frequency range, and a demodulator coupled to the other antenna port is operable to demodulate symbols according to an RFID protocol in a second frequency range. In some embodiments the frequency ranges are disjoint, intersecting, or one is a proper subset of the other. In some embodiments each port is coupled to its own rectifier and/or its own modulator and/or its own demodulator. In some embodiments an RFID tag includes the IC and two antennas, each operable in one of the two frequency ranges.
摘要:
Systems and methods for determining a Q value for a subsequent inventory round can include a radio frequency identification (RFID) interrogator determining at least one of: a number of empty slots, a number of collided slots, and a number of singly occupied slots, in response to the completion of an inventory round, and applying a function to at least one of: the number of empty slots, the number collided slots, and the number of singly occupied slots, to determine the Q value.
摘要:
Systems and methods for inventory round slot classification are described. The method includes transmitting, to zero or more RFID tags, a message during a slot of an inventory round and receiving a response from at least some of the zero or more RFID tags. The method also includes analyzing a received response for the presence of the pilot tone and classifying a respective slot in response to the analysis.
摘要:
A method of operating a plurality of Radio Frequency Identification (RFID) readers includes operating the readers according to a spatial-division and time-division synchronization schedule. Each reader may be associated with a reader group, and the schedule may specify a duration of time that all of the readers in a group may be active. Readers in different reader groups may be scheduled independent of readers in other reader groups.