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.

Abstract: In accordance with an embodiment, a voltage controlled oscillator (VCO) includes a VCO core having a plurality of transistors and a varactor circuit that has a first end coupled to emitter terminals of the VCO core and a second end coupled to a tuning terminal. The varactor circuit includes a capacitance that increases with increasing voltage applied to the tuning terminal with respect to the emitter terminals of the VCO core.

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 method of recognizing a biological target includes performing radar measurements for a plurality of sites on the biological target using a millimeter-wave radar sensor, producing a target data set for the plurality of sites based on the radar measurements, extracting features from the target data set, comparing the extracted features to stored features, and determining whether the extracted features match the stored features based on the comparing

Abstract: In accordance with some embodiments, a method is provided. The method includes accessing a predefined numeric sequence at an application processor. The method further includes receiving, from a sensor of the sensor system, a verification sequence having a predetermined quantity of repetitions of the predefined numeric sequence. The method further includes correlating the verification sequence with the predefined numeric sequence. The method further includes counting a quantity of correlations between the predefined numeric sequence and the verification sequence. The method further includes adjusting a parameter of the sensor or the application processor in response to the predetermined quantity of repetitions not equaling the quantity of correlations.

Abstract: A method of operating a radar system includes transmitting a plurality of transmitted radio frequency (RF) signals by a plurality of directional antennas. The plurality of directional antennas is disposed on a planar surface of a substrate. Each of the plurality of antennas is in a fixed orientation and position on the planar surface. A respective individual coverage of each of the plurality of directional antennas is less than 360°. A combined coverage of the plurality of transmitted RF signals completely covers a 360° region surrounding the radar system. The method also includes receiving a reflected RF signal by a directional antenna of the plurality of directional antennas.

Abstract: Coupling apparatuses, circuits having such coupling apparatuses and corresponding methods are provided that involve a first and a second signal being coupled out from an out-coupling circuit part and being separately coupled into first and second circuit pmts. The use of different coupling mechanisms effects signal separation in this case. In particular, one of the signals can be coupled as a differential signal and the other as a common mode signal.

Abstract: In accordance with an embodiment, a method for operating a radio frequency (RF) transceiver includes frequency-translating, using a local oscillator signal having a calibrated phase shift, a signal received at an antenna of an RF transceiver; filtering the frequency-translated signal using a programmable filter of the RF transceiver to produce a filtered frequency-translated signal; and changing a cutoff frequency of the programmable filter from a first cutoff frequency to a second cutoff frequency in response to the RF transceiver switching operation from a first mode to a second mode.

Abstract: A semiconductor device package includes a radio frequency front end circuit configured to process radio frequency signals, a first antenna, an antenna substrate, and a first conductive barrier. The first antenna is configured to transmit/receive a first radio frequency signal. The antenna substrate includes the first antenna. The antenna substrate is configured to transfer the first radio frequency signal between the radio frequency front end circuit and the first antenna. The first conductive barrier is configured to electromagnetically and electrostatically isolate the first antenna.

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: A circuit includes a differential input pair stage including bipolar transistors and configured to receive an RF input signal; a cascode stage coupled between the differential input pair stage and an output node, the cascode stage including bipolar transistors; and a current source including a first bipolar transistor coupled to a first output of the differential input pair stage and a second bipolar transistor coupled to a second output of the differential input pair stage.

Abstract: A circuit includes a differential input pair stage including bipolar transistors and configured to receive an RF input signal; a cascode stage coupled between the differential input pair stage and an output node, the cascode stage including bipolar transistors; and a current source including a first bipolar transistor coupled to a first output of the differential input pair stage and a second bipolar transistor coupled to a second output of the differential input pair stage.

Abstract: In accordance with an embodiment, a method for operating a radio frequency (RF) transceiver includes frequency-translating, using a local oscillator signal having a calibrated phase shift, a signal received at an antenna of an RF transceiver; filtering the frequency-translated signal using a programmable filter of the RF transceiver to produce a filtered frequency-translated signal; and changing a cutoff frequency of the programmable filter from a first cutoff frequency to a second cutoff frequency in response to the RF transceiver switching operation from a first mode to a second mode.

Abstract: A mixing stage includes a first modulation stage that receives an input signal from a first common node of the mixing stage, a first local oscillator input that receives a local oscillator signal, and a first modulation signal output adapted to provide a first modulated signal. A second modulation stage of the mixing stage includes a second input that receives a phase inverted representation of the input signal from a second common node of the mixing stage, a second local oscillator input that receives the local oscillator signal, and a second modulation signal output adapted to provide a second modulated signal. A current generation circuit provides a supply current to the first common node and to the second common node. A current control circuit is adapted to superimpose an offset current to the current of at least one node of the first common node and the second common node.

Abstract: A semiconductor device package includes an integrated circuit chip comprising a radio frequency device. The radio frequency device includes active circuitry at a first surface of the integrate circuit chip. An antenna substrate is disposed over the first surface of the integrated circuit. The antenna substrate includes a first conductive layer disposed over the first surface of the integrated circuit chip. The first conductive layer includes a first transmission line electrically coupled to the integrated circuit chip. A first laminate layer is disposed over the first conductive layer. The first laminate layer overlaps a first part of the first transmission line. A second conductive layer is disposed over the first laminate layer. The second conductive layer includes a first opening overlapping a second part of the first transmission line. A second laminate layer is disposed over the second conductive layer.

Abstract: In accordance with an embodiment, a method of operating a radar system includes receiving radar configuration data from a host, and receiving a start command from the host after receiving the radar configuration data. The radar configuration data includes chirp parameters and frame sequence settings. After receiving the start command, configuring a frequency generation circuit is configured with the chirp parameters and radar frames are triggered at a preselected rate.

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: In accordance with an embodiment, a Radio Frequency (RF) front end system includes a first chip that includes a frequency multiplier coupled to a first input terminal. The frequency multiplier is configured to form an upscaled reference signal by upscaling in frequency an oscillating reference signal received at the first input terminal. The first chip also includes a Voltage-Controlled Oscillator (VCO) configured to provide a first oscillating VCO signal, and an oscillator switch coupled to the VCO and the frequency multiplier. The oscillator switch is configured to select a Local Oscillator (LO) signal from between the first oscillating VCO signal and the upscaled reference signal. The first chip also includes a first phase shifter coupled to an output of the oscillator switch, and a modulator having an input coupled to an output of the first phase shifter.

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.

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.