The disclosure provides a radar apparatus for estimating a position and a velocity of a plurality of obstacles. The radar apparatus includes a slave radar chip. A master radar chip is coupled to the slave radar chip. The master radar chip includes a local oscillator that generates a transmit signal. The slave radar chip receives the transmit signal on a first path and sends the transmit signal back to the master radar chip on a second path. A delay detect circuit is coupled to the local oscillator and receives the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator. The delay detect circuit estimates a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.

A device is described. The device includes a chip, a reflector, and an antenna. The reflector is disposed on a surface of the chip. The reflector is a metalized layer on the surface of the chip.

The disclosure provides a radar apparatus for estimating a position and a velocity of a plurality of obstacles. The radar apparatus includes a slave radar chip. A master radar chip is coupled to the slave radar chip. The master radar chip includes a local oscillator that generates a transmit signal. The slave radar chip receives the transmit signal on a first path and sends the transmit signal back to the master radar chip on a second path. A delay detect circuit is coupled to the local oscillator and receives the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator. The delay detect circuit estimates a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.

In some embodiments, a device may comprise a substrate having signal generation circuitry, a transmitter, a receiver, and interface circuitry each mounted thereon. The transmitter may comprise a transmit semiconductor die having integrated thereon transmit circuitry configured to generate, based on a reference RF signal generated by the signal generation circuitry, first RF signals having an RF center frequency between 300-320 GHz and a transmit antenna array comprising a plurality of RF antennas configured to transmit the first RF signals. The receiver may comprise a receive semiconductor die having integrated thereon a receive antenna array comprising a plurality of RF antennas configured to receive second RF signals having the RF center frequency and receive circuitry configured to generate third RF signals based on the reference RF signal and mix the second RF signals with the third RF signals to obtain fourth RF signals. The interface circuitry may comprise ADC circuitry.

The disclosure relates to a Gilbert mixer. Example embodiments include a Gilbert mixer that includes first and second multi-finger field effect transistor, FET, devices, each including gate fingers arranged between alternating source terminals and drain terminals; first and second pairs of voltage rails arranged across the first and second FET devices respectively, each of the first and second pairs including an upper rail and a lower rail; a first interconnect connecting the upper rail of the first pair and the lower rail of the second pair to a first input terminal; and a second interconnect connecting the lower rail of the first pair and the upper rail of the second pair to a second input terminal. Gate fingers of the first FET device are connected to the first pair of voltage rails and gate fingers of the second FET device are connected to the second pair of voltage rails.

A radar transceiver is provided. The radar transceiver includes an electrical balance duplexer that is coupled to a transmission node of a transmission path, a reception node of a reception path, and an antenna node and that is configured to isolate the transmission path from the reception path. The electrical balance duplexer includes a hybrid transformer network and a non-tunable balancing impedance. The non-tunable balancing impedance is configured to provide a fixed impedance value that corresponds to an impedance value at the antenna node.