Abstract: In an embodiment, a method of testing a radio frequency integrated circuit (RFIC) includes generating high frequency test signals using the on-chip test circuit, measuring signal levels using on-chip power detectors, and controlling and monitoring the on-chip test circuit using low frequency signals. The RFIC circuit is configured to operate at high frequencies, and an on-chip test circuit that includes frequency generation circuitry configured to operate during test modes.

Abstract: In an embodiment, a method of testing a radio frequency integrated circuit (RFIC) includes generating high frequency test signals using the on-chip test circuit, measuring signal levels using on-chip power detectors, and controlling and monitoring the on-chip test circuit using low frequency signals. The RFIC circuit is configured to operate at high frequencies, and an on-chip test circuit that includes frequency generation circuitry configured to operate during test modes.

Abstract: In an embodiment, a method of testing a radio frequency integrated circuit (RFIC) includes generating high frequency test signals using the on-chip test circuit, measuring signal levels using on-chip power detectors, and controlling and monitoring the on-chip test circuit using low frequency signals. The RFIC circuit is configured to operate at high frequencies, and an on-chip test circuit that includes frequency generation circuitry configured to operate during test modes.

Abstract: In an embodiment, a method of testing a radio frequency integrated circuit (RFIC) includes generating high frequency test signals using the on-chip test circuit, measuring signal levels using on-chip power detectors, and controlling and monitoring the on-chip test circuit using low frequency signals. The RFIC circuit is configured to operate at high frequencies, and an on-chip test circuit that includes frequency generation circuitry configured to operate during test modes.

Abstract: One embodiment relates to a mixer for providing a mixed output signal. The mixer includes a radio-frequency (RF) stage, first and second power dividers, and first and second frequency-conversion stages. The RF stage includes a first differential pair. The first power divider is coupled to a first transistor of the first differential pair, and the second power divider is coupled to a second transistor of the first differential pair. The first frequency-conversion stage, which is adapted to provide a first converted-frequency signal, includes a second differential pair coupled to the second power divider and a third differential pair coupled to the first power divider. The second frequency-conversion stage, which is adapted to provide a second converted-frequency signal, includes a fourth differential pair coupled to the second power divider and a fifth differential pair coupled to the first power divider. Other techniques are also provided.

Abstract: An antenna multiplexer with a pi-network circuit is described, having an inductance connected in series and, on each of the two connection sides of the inductance, a capacitance connected in parallel. The pi-network circuit is used for effecting an impedance mismatch of a signal path of the antenna multiplexer.

Abstract: One embodiment relates to a mixer for providing a mixed output signal. The mixer includes a radio-frequency (RF) stage, first and second power dividers, and first and second frequency-conversion stages. The RF stage includes a first differential pair. The first power divider is coupled to a first transistor of the first differential pair, and the second power divider is coupled to a second transistor of the first differential pair. The first frequency-conversion stage, which is adapted to provide a first converted-frequency signal, includes a second differential pair coupled to the second power divider and a third differential pair coupled to the first power divider. The second frequency-conversion stage, which is adapted to provide a second converted-frequency signal, includes a fourth differential pair coupled to the second power divider and a fifth differential pair coupled to the first power divider. Other techniques are also provided.

Abstract: In one embodiment, RF front-end circuit includes a tunable matching network having an input coupled to an RF interface port, a directional coupler with a first connection coupled to an RF input of a mixer, a second connection coupled to an RF signal generation port, and a third connection coupled to an output of the tunable matching network. The directional coupler is configured to direct a signal from the RF signal generation port to the tunable matching network and to direct a signal from the tunable matching network port to the RF port of the mixer. The RF front-end circuit also has a tunable matching network control unit coupled to the tunable matching network. The control unit is configured to optimize an impedance match between the RF interface port and the output of the tunable matching network.

Abstract: An RF sender/receiver front-end is disclosed comprising a terminal for receiving an oscillator signal, at least one distribution unit for distributing the oscillator signal into different signal paths, two or more mixer-arrangements for sending a transmit-signal or for receiving an receive-signal, where each mixer-arrangement comprises a mixer and an amplifier for amplifying the oscillator signal and generating the transmit-signal.

Abstract: An RF sender/receiver front-end is disclosed comprising a terminal for receiving an oscillator signal, at least one distribution unit for distributing the oscillator signal into different signal paths, two or more mixer-arrangements for sending a transmit-signal or for receiving an receive-signal, where each mixer-arrangement comprises a mixer and an amplifier for amplifying the oscillator signal and generating the transmit-signal.

Abstract: An RF sender/receiver front-end is disclosed comprising a terminal for receiving an oscillator signal, at least one distribution unit for distributing the oscillator signal into different signal paths, two or more mixer-arrangements for sending a transmit-signal or for receiving an receive-signal, where each mixer-arrangement comprises a mixer and an amplifier for amplifying the oscillator signal and generating the transmit-signal.

Abstract: An RF front-end includes an input configured to receive an oscillator signal, and an antenna port configured to transmit a transmission signal and receive a reception signal from an antenna. The RF front-end further includes a mixer having an RF-input configured to receive the reception signal, an oscillator input configured to receive a modified oscillator signal, and an output. The mixer is configured to mix the received signal into an intermediate frequency band or a base band using the oscillator signal. Also included is a directional coupler connected to the antenna port, the input for the oscillator signal, and the mixer. The coupler is configured to couple the oscillator signal as a transmission signal to the antenna via the antenna port, and couple the reception signal from the antenna to the RF-input of the mixer. Also included is a first phase shifter or a second phase shifter.

Abstract: An antenna multiplexer with a pi-network circuit is described, comprising an inductance connected in series and, on each of the two connection sides of the inductance, a capacitance connected in parallel. The pi-network circuit is used for effecting an impedance mismatch of a signal path of the antenna multiplexer.

Abstract: A spindle shaft is flexurally elastic at its shank part mounted in a bearing sleeve. The spindle shaft carries a belt-engaging wharve which is arranged underneath the neck bearing and to which a drive belt engages to rotate the spindle shaft. The bearing sleeve is arranged to have radial play within a spindle housing 10. The bearing sleeve is fastened at its lower end via a flexurally elastic tilting joint 40 to the spindle housing 10 connected rigidly to the spindle rail. The pulling force of the drive belt engaged to the wharve during operation deflects the bearing sleeve radially by tilting it about the tilting joint. Such deflection brings about, on the other hand, a pivoting of the bobbin-carrying upper part of the spindle shaft about the neck bearing in the opposite direction as a result of the bending moment occurring on the shank part, an inclination of the spindle shaft with its upper part is thus avoided.