Abstract: A method for operating a mobile device includes detecting a gesture by the mobile device. Detecting the gesture includes receiving a reflected millimeter wave signal by the mobile device, generating a first message in accordance with the detected gesture, and transmitting the first message from the mobile device to an external remote device. The detected gesture is associated with an operation of the remote device.

Abstract: According to an embodiment, a wearable device includes a frame, a first circuit board within the frame, and a display over and coupled to the first circuit board. The wearable device further includes a second circuit board electrically coupled to the first circuit board, and a mm-wave gesture sensing system mounted on the second circuit board.

Abstract: In accordance with an embodiment, a packaged radio frequency (RF) circuit includes a radio frequency integrated circuit (RFIC) disposed on a substrate that has plurality of receiver circuits coupled to receive ports at a first edge of the RFIC, and a first transmit circuit coupled to a first transmit port at a second edge of the RFIC. The packaged RF circuit also includes a receive antenna system disposed on the package substrate adjacent to the first edge of the RFIC and a first transmit antenna disposed on the package substrate adjacent to the second edge of the RFIC and electrically coupled to the first transmit port of the RFIC. The receive antenna system includes a plurality of receive antenna elements that are each electrically coupled to a corresponding receive port.

Abstract: A system includes a millimeter-wave radar sensor circuit configured to be fastened to a wheel having a tire, and a controller. The millimeter-wave radar sensor circuit is configured to transmit a radio-frequency (RF) signal towards a portion of an inner surface of the tire and receive a reflected signal from the tire. The controller is configured to process the reflected signal, determine a property value of the tire based on processing the reflected signal, and generate and transmit a first signal representative of the property value of the tire.

Abstract: A treadmill includes a belt, a display, a first sensor having first transmission circuitry for transmitting a first radar beam over the belt and first reception circuitry for detecting a first reflected signal that is a reflection of the first radar beam from a user on the belt, a processor connected to the first sensor, the belt and the display, and a non-transitory computer-readable storage medium storing a program to be executed by the processor. The program includes instructions for determining, according to the first reflected signal, first data associated with a vital sign of the user and displaying, according to the first data, the vital sign on the display.

Abstract: An embodiment method includes identifying a set of targets within a field of view of a millimeter-wave radar sensor based on radar data received by the millimeter-wave radar sensor; capturing radar data corresponding to the set of targets across a macro-Doppler frame; performing macro-Doppler processing on the macro-Doppler frame and determining whether a macro-Doppler signal is present in the macro-Doppler frame based on the macro-Doppler processing; capturing radar data corresponding to the set of targets across a micro-Doppler frame, wherein the micro-Doppler frame has a duration equal to a first plurality of macro-Doppler frames; performing micro-Doppler processing on the micro-Doppler frame and determining whether a micro-Doppler signal is present in the micro-Doppler frame based on the micro-Doppler processing; and activating at least one range bin of a plurality of range bins in response to a determination that at least one of the macro-Doppler signal or the micro-Doppler signal is present.

Abstract: A method of measuring vital signals using a millimeter-wave radar sensor system includes performing a first set of radar measurements using a millimeter-wave radar sensor to produce a first set of radar data; determining a first set of range gate measurements from the first set of radar data; determining high response range gates from the first set of range gate measurements; and extracting vital signal information from the high response range gates.

Abstract: A system includes a millimeter-wave radar sensor disposed on a circuit board, a plurality of antennas coupled to the millimeter-wave radar sensor and disposed on the circuit board, and a processing circuit coupled to the millimeter-wave radar sensor and disposed on the circuit board. The processing circuit is configured to determine vital signal information based on output from the millimeter-wave radar sensor.

Abstract: A radar system includes a substrate, a first received antenna, a second receive antenna, and radio frequency (RF) circuitry. The substrate includes a first side and a second side. The first side is opposite the second side. The first receive antenna is disposed at the first side and is configured to receive a first reflected RF signal. The second receive antenna is configured to receive a second reflected RF signal. The RF circuitry is operatively coupled to the first receive antenna and the second receive antenna. The RF circuitry is configured to detect a first object located on the first side of the substrate according to the first reflected RF signal. The RF circuitry is further configured to detect biometric data from a second object located on the second side of the substrate according to the second reflected RF signal.

Abstract: In accordance with an embodiment, a packaged radio frequency (RF) circuit includes a radio frequency integrated circuit (RFIC) disposed on a substrate that has plurality of receiver circuits coupled to receive ports at a first edge of the RFIC, and a first transmit circuit coupled to a first transmit port at a second edge of the RFIC. The packaged RF circuit also includes a receive antenna system disposed on the package substrate adjacent to the first edge of the RFIC and a first transmit antenna disposed on the package substrate adjacent to the second edge of the RFIC and electrically coupled to the first transmit port of the RFIC. The receive antenna system includes a plurality of receive antenna elements that are each electrically coupled to a corresponding receive port.

Abstract: A radio frequency (RF) device includes a plurality of mixers, each of the plurality of mixers having a first input terminal, a second input terminal, and an output terminal; and a self-test circuit.

Abstract: A radio frequency (RF) system includes an RF integrated circuit (IC) die, and an antenna coupled to the RF IC die. The RF system further includes a reflector layer over the RF IC die, the reflector layer extending over at least a portion of the antenna, a combination of the antenna and the reflector layer having a radiation pattern that comprises a main lobe in a first direction parallel to a top surface of the reflector layer.

Abstract: A radio frequency (RF) system includes an RF integrated circuit (IC) die, and an antenna coupled to the RF IC die. The RF system further includes a reflector layer over the RF IC die, the reflector layer extending over at least a portion of the antenna, a combination of the antenna and the reflector layer having a radiation pattern that comprises a main lobe in a first direction parallel to a top surface of the reflector layer.

Abstract: In accordance with an embodiment, a packaged radio frequency (RF) circuit includes a radio frequency integrated circuit (RFIC) disposed on a substrate that has plurality of receiver circuits coupled to receive ports at a first edge of the RFIC, and a first transmit circuit coupled to a first transmit port at a second edge of the RFIC. The packaged RF circuit also includes a receive antenna system disposed on the package substrate adjacent to the first edge of the RFIC and a first transmit antenna disposed on the package substrate adjacent to the second edge of the RFIC and electrically coupled to the first transmit port of the RFIC. The receive antenna system includes a plurality of receive antenna elements that are each electrically coupled to a corresponding receive port.

Abstract: A radio frequency (RF) system includes a flexible substrate that includes a first portion and a second portion. The first portion overlaps a first surface of a substrate. The first surface is on a first side of the RF system. The second portion overlaps a second surface of the substrate. The second surface is on a second side of the RF system. The RF system further includes an antenna disposed over the first portion of the flexible substrate. The antenna is configured to transmit/receive RF signals on the first side of the RF system. The RF system also includes a transmission line disposed on a bent region of the flexible substrate between the first portion and the second portion. The transmission line is configured to propagate the RF signals between the first portion and the second portion on the second side of the RF system.

Abstract: A radar system includes a substrate that includes a first surface and a second surface. The first surface is opposite the second surface. The radar system further includes transmitter front-end circuitry attached to the substrate and configured to transmit a transmitted radio frequency (RF) signal in a first direction away from the first surface and in a second direction away from the second surface. The radar system also includes a first receive antenna and a second receive antenna. The first receive antenna is disposed at the first surface and is configured to receive a first reflected RF signal propagating in the second direction and generated by the transmitted RF signal. The second receive antenna is disposed at the second surface and is configured to receive a second reflect RF signal propagating in the first direction and generated by the transmitted RF signal.

Abstract: An embodiment system may include a first millimeter-wave radar sensor coupled to a driver-side door of a vehicle, and a second millimeter-wave radar sensor coupled to a side-view mirror of the vehicle adjacent to the driver-side door. The first millimeter-wave radar sensor may be configured to produce a first set of radar data indicative of a presence of an object within a first field of view, and the second millimeter-wave radar sensor may be configured to produce a second set of radar data indicative of a presence of the object within a second field of view. The system may further include a processing circuit coupled to the first millimeter-wave radar sensor and the second millimeter-wave radar sensor, and a controller coupled to the processing circuit, the controller being configured to control an operation of the vehicle based on a control signal provided to the controller by the processing circuit.

Abstract: According to an embodiment, a method for presence detection includes performing a first scanning comprising scanning a first area using a millimeter-wave radar sensor to produce a first set of radar data; identifying a first set of targets based on the first set of radar data; performing a second scanning comprising scanning portions of the first area corresponding to the first set of targets using the millimeter-wave radar sensor, and performing micro-Doppler measurements on the portions of the first area; and determining which targets of the first set of targets meet a first set of criteria based on the micro-Doppler measurements.

Abstract: In accordance with an embodiment, a method includes receiving a first differential logic signal using a first branch of a circuit that extends from a voltage supply of the circuit as far as an earth terminal of the circuit and has at least one first differential transistor pair, receiving a second differential logic signal using a second branch of the circuit that extends from the voltage supply to the earth terminal and has at least one second differential transistor pair, conducting a current flow between the first branch and the second branch, and outputting an output signal by the second branch.

Abstract: A radio frequency (RF) system includes an RF integrated circuit (IC) die. The RF IC die includes a first transmit circuit, a second transmit circuit, a first receive circuit, a second receive circuit, and a control circuit coupled to the first transmit circuit, the second transmit circuit, the first receive circuit, and the second receive circuit. The RF system further includes a first antenna coupled to the first transmit circuit and the first receive circuit using a first coupling structure. The control circuit is configured to activate the first transmit circuit and deactivate the first receive circuit during a first operation mode. The RF system further includes a second antenna coupled to the second transmit circuit and the second receive circuit using a second coupling structure. The control circuit is configured to activate the second transmit circuit and deactivate the second receive circuit during a second operation mode.