Abstract: In accordance with a first aspect of the present disclosure, a power converter is disclosed, comprising: an input configured to receive an input voltage; an output configured to provide an output voltage; a power switching block coupled between the input and the output; a controller configured to control the power switching block, wherein the controller is configured to open and close switches comprised in the power switching block, wherein the controller is further configured to control a resistance of the power switching block. In accordance with a second aspect of the present disclosure, a corresponding method of operating a power converter is conceived.

Abstract: In accordance with a first aspect of the present disclosure, a power converter is disclosed, comprising: an input configured to receive an input voltage; an output configured to provide an output voltage; a power switching block coupled between the input and the output; a controller configured to control the power switching block, wherein the controller is configured to open and close switches comprised in the power switching block, wherein the controller is further configured to control a resistance of the power switching block. In accordance with a second aspect of the present disclosure, a corresponding method of operating a power converter is conceived.

Abstract: This specification discloses methods and systems for reducing negative undershoot during transient load response for a PWM (Pulse Width Modulation) boost power converter. In some embodiments, reduction of negative undershoot during transient load response is achieved by overriding the PWM duty cycle to a maximum duty cycle when VDDBOOST drops during load step. This maximum duty cycle (“max”) mode is triggered when VDDBOOST is within a hysteresis window. Setpoint for maximum duty cycle is versus DCDC converter output and input voltage. In some embodiments, a lookup table is implemented for determining the setpoint for maximum duty cycle.

Abstract: This specification discloses methods and systems for reducing negative undershoot during transient load response for a PWM (Pulse Width Modulation) boost power converter. In some embodiments, reduction of negative undershoot during transient load response is achieved by overriding the PWM duty cycle to a maximum duty cycle when VDDBOOST drops during load step. This maximum duty cycle (“max”) mode is triggered when VDDBOOST is within a hysteresis window. Setpoint for maximum duty cycle is versus DCDC converter output and input voltage. In some embodiments, a lookup table is implemented for determining the setpoint for maximum duty cycle.

Abstract: A RF transceiver for RF communication with a further RF transceiver is described. The RF transceiver comprises a RF transmitter; a clock generator coupled to the RF transmitter, the clock generator comprising a crystal oscillator circuit including an amplifier, a distance monitor configured to monitor the distance between the RF transceiver and the further RF transceiver; a controller coupled to the distance monitor and the clock generator. The controller is configured to vary the crystal oscillator swing amplitude dependent on the distance between the RF transceiver and the further RF transceiver.

Abstract: One example discloses a switching capacitive power converter, SCPC, including: an energy storage element; a voltage reference controller, and configured to output an adjusted reference voltage based on a received fixed reference voltage; and a charge pumping circuit configured to operate the SCPC at a charge pumping frequency and configured to charge the energy storage element at the charge pumping frequency if an absolute value of the power converter's output voltage is below an absolute value of the adjusted reference voltage; wherein if the charge pumping frequency is within a predetermined frequency exclusion range, the voltage reference controller is configured to set the adjusted reference voltage to a value such that the charge pumping frequency is no longer within the predetermined frequency exclusion range.

Abstract: A RF transceiver for RF communication with a further RF transceiver is described. The RF transceiver comprises a RF transmitter; a clock generator coupled to the RF transmitter, the clock generator comprising a crystal oscillator circuit including an amplifier, a distance monitor configured to monitor the distance between the RF transceiver and the further RF transceiver; a controller coupled to the distance monitor and the clock generator. The controller is configured to vary the crystal oscillator swing amplitude dependent on the distance between the RF transceiver and the further RF transceiver.

Abstract: One example discloses a switching capacitive power converter, SCPC, including: an energy storage element; a voltage reference controller, and configured to output an adjusted reference voltage based on a received fixed reference voltage; and a charge pumping circuit configured to operate the SCPC at a charge pumping frequency and configured to charge the energy storage element at the charge pumping frequency if an absolute value of the power converter's output voltage is below an absolute value of the adjusted reference voltage; wherein if the charge pumping frequency is within a predetermined frequency exclusion range, the voltage reference controller is configured to set the adjusted reference voltage to a value such that the charge pumping frequency is no longer within the predetermined frequency exclusion range.

Abstract: A DC-DC converter uses a switched capacitor arrangement. A filter capacitor is connected between one terminal of the capacitor arrangement and a fixed voltage line and a calibration arrangement is used for setting or enabling selection of the capacitance of the filter capacitor. In this way, a capacitance is added to a terminal of the switched capacitor arrangement. The capacitance value can be chosen or adjusted to keep the DC-DC converter current capability within specification limits.

Abstract: A DC-DC converter comprises a capacitor arrangement and a switching arrangement for controlling coupling of the capacitor arrangement to a converter input during a loading phase and to a converter output during a storing phase. The converter cycles between charge pumping stages and charge holding phases, giving rise to a converter switching frequency. A variable output load is controlled thereby to maintain a constant converter switching frequency.

Abstract: A DC-DC converter comprises a capacitor arrangement and a switching arrangement for controlling coupling of the capacitor arrangement to a converter input during a loading phase and to a converter output during a storing phase. The converter cycles between charge pumping stages and charge holding phases, giving rise to a converter switching frequency. A variable output load is controlled thereby to maintain a constant converter switching frequency.

Abstract: A DC-DC converter uses a switched capacitor arrangement. A filter capacitor is connected between one terminal of the capacitor arrangement and a fixed voltage line and a calibration arrangement is used for setting or enabling selection of the capacitance of the filter capacitor. In this way, a capacitance is added to a terminal of the switched capacitor arrangement. The capacitance value can be chosen or adjusted to keep the DC-DC converter current capability within specification limits.

Abstract: The present invention relates to a converter circuit and a conversion method for converting an input signal of a first value to an output signal of a second value based on a switched operating mode, wherein an output feedback loop (40) and an additional input forward control loop (60) are provided. The additional input forward control loop (60) serves to correctly control a switching parameter not only with respect to the output load but also over a wide input voltage range. This leads to an improved power efficiency and reliability of the converter circuit.

Abstract: In a method of checking the integrity of an antenna arrangement (2) of a transmitter (1), which transmitter (1) comprises a transmitter driving stage (4) for driving the antenna arrangement (2) with a driving current (is), a first value (Isupply) indicative of the driving current (is) is determined. After that, it is detected whether the driving current (i) is outside a predefined current range by comparing the first value (Isupply) with a predefined first value range. If the first value (Isupply) is outside the first value range, then it is indicated that the antenna arrangement (2) is not in sound condition. The antenna arrangement (2) is comprised of an antenna (5) and a tuning network (6) connected between the antenna (5) and the transmitter driving stage (4).

Abstract: The present invention relates to a converter circuit and a conversion method for converting an input signal of a first value to an output signal of a second value based on a switched operating mode, wherein an output feedback loop (40) and an additional input forward control loop (60) are provided. The additional input forward control loop (60) serves to correctly control a switching parameter not only with respect to the output load but also over a wide input voltage range. This leads to an improved power efficiency and reliability of the converter circuit.

Abstract: The present invention relates to a converter circuit and a conversion method for converting an input signal to an output signal of a predetermined value based on a switched operating mode, wherein a first control loop (40) is provided for comparing the predetermined value of the output signal to a first reference value and for generating a feedback signal in response to the comparison result; and wherein a second control loop (60) is provided for comparing a time period passed until the feedback signal is generated to a second reference value and for controlling the switching parameter of the switched operating mode in response to the comparison result. As a result, the output signal is correctly controlled not only with respect to the output load but also over a wide range of the input signal, so that power efficiency and reliability can be optimized.