A device may include a voltage-to-current converter circuit having an operational transconductance amplifier (OTA), the voltage-to-current converter circuit for generating a bias current that is proportional to a reference voltage at a reference voltage input port of the OTA, and a bias current feedback path for providing the bias current to a bias current input port of the OTA. The device may further include a startup current generator circuit coupled to the bias current input port of the OTA, the startup current generator circuit controllable to provide a startup current to the bias current input port during a startup of the device and to be deactivated after the startup of the device.

The present disclosure provides a power ramping circuit configured to generate a combined output signal comprising: a plurality of ramp slice circuits each configured to, upon activation, provide an output voltage, wherein the power ramping circuit is configured to combine the output voltages of the ramp slice circuits in order to provide the combined output signal, and wherein each ramp slice circuit comprises: a buffer circuit comprising a buffer amplifier; and a smoothing circuit configured to selectively operate in a current-limiting mode and a non-current-limiting mode and an RF power amplifier which is configured to amplify an input signal and wherein the amplification applied by the RF power amplifier is controlled by the buffer circuit.