Abstract: A calibration method for a phased array system comprises sequentially injecting a tone into a first plurality of antenna elements of an antenna array, receiving the tone by a second plurality of antenna elements of the antenna array through parasitic coupling between the first plurality of antenna elements and the second plurality of antenna elements, measuring a plurality of phase errors between the first plurality of antenna elements and the second plurality of antenna elements, populating a lookup table with the plurality of phase errors, and calibrating a plurality of phase shifters associated with a plurality of channels in the phased array system using the plurality of phase errors in the lookup table.

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a first tunable transmit band stop filter, and a power amplifier coupled to an output of the first tunable transmit band stop filter, where the first tunable transmit band stop filter is configured reject a receive frequency and pass a transmit frequency; a receive path comprising an LNA; and a duplex filter having a transmit path port coupled to an output of the power amplifier, a receive path port coupled to an input of the LNA, and an antenna port, where the duplex filter is configured to pass the transmit frequency and reject the receive frequency between the antenna port and the transmit path port, pass the receive frequency and reject the transmit frequency between the antenna port and the receive path port.

Abstract: A calibration method for a phased array system comprises sequentially injecting a tone into a first plurality of antenna elements of an antenna array, receiving the tone by a second plurality of antenna elements of the antenna array through parasitic coupling between the first plurality of antenna elements and the second plurality of antenna elements, measuring a plurality of phase errors between the first plurality of antenna elements and the second plurality of antenna elements, populating a lookup table with the plurality of phase errors, and calibrating a plurality of phase shifters associated with a plurality of channels in the phased array system using the plurality of phase errors in the lookup table.

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a transmit RF filter and an adjustable transmit phase shifter/matching network coupled between the transmit RF filter and a transmit antenna port, where the adjustable transmit phase shifter/matching network is configured to transform an impedance of the transmit RF filter at a receive frequency from a first lower impedance to a first higher impedance at the transmit antenna port; and a receive path having a receive RF filter and an adjustable receive phase shifter/matching network coupled between the receive RF filter and a receive antenna port, where the adjustable receive phase shifter/matching network is configured to transform an impedance of the receive RF filter at a transmit frequency from a second lower impedance to a second higher impedance at the receive antenna port.

Abstract: In accordance with an embodiment, a method of operating an RF system includes generating a first RF signal having a first frequency; filtering the generated first RF signal to form a first filtered transmitted signal; producing a first coupled signal and a first transmitted signal from the first filtered transmitted signal; transmitting the first transmitted signal; transmitting a second RF signal having a second frequency; bandpass filtering the first coupled signal to form a first tunable bandpass filtered signal; and measuring a parameter of the first tunable bandpass filtered signal.

Abstract: In accordance with an embodiment, a method of operating an RF system includes filtering a first wideband RF signal using a wideband filter bank. Filtering the first RF signal includes separating the first wideband RF signal into frequency cluster signals, where each frequency cluster signal of the frequency cluster signals includes different frequency ranges, the first wideband RF signal includes multiple RF bands, and each of the different frequency ranges comprises a plurality of RF bands of the multiple RF bands. The method further includes band stop filtering at least one of the frequency cluster signals to produce a band stopped frequency cluster signal.

Abstract: In accordance with an embodiment, a method of operating an RF system includes filtering a wideband RF signal using an adjustable center frequency bandpass filter to produce a filtered RF signal; amplifying the filtered RF signal to produce an amplified RF signal; and band stop filtering the amplified RF signal to produce a band stopped RF signal.

Abstract: An apparatus for reducing a magnetic coupling between a first electronic circuit and a second electronic circuit is provided. The apparatus includes a conductor loop enclosing the first electronic circuit or the second electronic circuit, and a tuning element coupled to the conductor loop. The conductor loop and the tuning element form a resonant circuit, wherein the tuning element is configured to adjust a resonance frequency of the resonant circuit to a frequency related to a frequency of a signal processed by the second electronic circuit.

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a first tunable transmit band stop filter, and a power amplifier coupled to an output of the first tunable transmit band stop filter, where the first tunable transmit band stop filter is configured reject a receive frequency and pass a transmit frequency; a receive path comprising an LNA; and a duplex filter having a transmit path port coupled to an output of the power amplifier, a receive path port coupled to an input of the LNA, and an antenna port, where the duplex filter is configured to pass the transmit frequency and reject the receive frequency between the antenna port and the transmit path port, pass the receive frequency and reject the transmit frequency between the antenna port and the receive path port.

Abstract: In accordance with an embodiment, a method of operating an RF system includes generating a first RF signal having a first frequency; filtering the generated first RF signal to form a first filtered transmitted signal; producing a first coupled signal and a first transmitted signal from the first filtered transmitted signal; transmitting the first transmitted signal; transmitting a second RF signal having a second frequency; bandpass filtering the first coupled signal to form a first tunable bandpass filtered signal; and measuring a parameter of the first tunable bandpass filtered signal.

Abstract: In accordance with an embodiment, a method of operating an RF system includes filtering a first wideband RF signal using a wideband filter bank. Filtering the first RF signal includes separating the first wideband RF signal into frequency cluster signals, where each frequency cluster signal of the frequency cluster signals includes different frequency ranges, the first wideband RF signal includes multiple RF bands, and each of the different frequency ranges comprises a plurality of RF bands of the multiple RF bands. The method further includes band stop filtering at least one of the frequency cluster signals to produce a band stopped frequency cluster signal.

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a transmit RF filter and an adjustable transmit phase shifter/matching network coupled between the transmit RF filter and a transmit antenna port, where the adjustable transmit phase shifter/matching network is configured to transform an impedance of the transmit RF filter at a receive frequency from a first lower impedance to a first higher impedance at the transmit antenna port; and a receive path having a receive RF filter and an adjustable receive phase shifter/matching network coupled between the receive RF filter and a receive antenna port, where the adjustable receive phase shifter/matching network is configured to transform an impedance of the receive RF filter at a transmit frequency from a second lower impedance to a second higher impedance at the receive antenna port.

Abstract: In accordance with an embodiment, a method of operating an RF system includes filtering a wideband RF signal using an adjustable center frequency bandpass filter to produce a filtered RF signal; amplifying the filtered RF signal to produce an amplified RF signal; and band stop filtering the amplified RF signal to produce a band stopped RF signal.

Abstract: In accordance with an embodiment, a circuit includes: a replica input transistor, a first replica cascode transistor, an active current source, and an active cascode biasing circuit. The active current source is configured to set a current flowing through the first replica cascode transistor and the replica input transistor to a predetermined value by adjusting a voltage of a control node of the replica input transistor; and an active cascode biasing circuit including a first output coupled to the control node of the first replica cascode transistor, and the active cascode biasing circuit configured to set a drain voltage of the replica input transistor to a predetermined voltage by adjusting a voltage of the control node of the first replica cascode transistor.

Abstract: In accordance with an embodiment, a circuit includes: a replica input transistor, a first replica cascode transistor, an active current source, and an active cascode biasing circuit. The active current source is configured to set a current flowing through the first replica cascode transistor and the replica input transistor to a predetermined value by adjusting a voltage of a control node of the replica input transistor; and an active cascode biasing circuit including a first output coupled to the control node of the first replica cascode transistor, and the active cascode biasing circuit configured to set a drain voltage of the replica input transistor to a predetermined voltage by adjusting a voltage of the control node of the first replica cascode transistor.

Abstract: An apparatus for reducing a magnetic coupling between a first electronic circuit and a second electronic circuit is provided. The apparatus includes a conductor loop enclosing the first electronic circuit or the second electronic circuit, and a tuning element coupled to the conductor loop. The conductor loop and the tuning element form a resonant circuit, wherein the tuning element is configured to adjust a resonance frequency of the resonant circuit to a frequency related to a frequency of a signal processed by the second electronic circuit.

Abstract: A transformer is provided. The transformer includes at least one first primary turn; at least one second primary turn; and a first secondary turn and a second secondary turn. The first secondary turn and the second secondary turn are arranged laterally between the at least one first primary turn and the at least one second primary turn. The first secondary turn and the second secondary turn are arranged one above the other.

Abstract: A transformer is provided. The transformer includes at least one first primary turn; at least one second primary turn; and a first secondary turn and a second secondary turn. The first secondary turn and the second secondary turn are arranged laterally between the at least one first primary turn and the at least one second primary turn. The first secondary turn and the second secondary turn are arranged one above the other.

Abstract: A transmission arrangement is disclosed having an amplifier which is set up to amplify a transmission signal and to provide it as an amplified transmission signal in differential form, an analysis circuit for determining a property of the amplified transmission signal, and a differential feedback path which is set up to supply the amplified transmission signal to the analysis circuit in differential form.

Abstract: One embodiment of the present disclosure relates to a circuit. The circuit includes a digital to analog converter (DAC) configured to convert a time-varying, multi-bit digital value to a corresponding time-varying output current. The circuit also includes a mixer module downstream of the DAC and comprising a plurality of mixers. A control block is configured to selectively steer output current from the DAC to different mixers of the mixer module. Other techniques are also described.