Abstract: The disclosure relates to a driver amplifier circuit. The driver amplifier circuit includes a non-linear differential amplifier and a non-linear resistor connected across output terminals of the differential amplifier. The non-linear resistor has a resistance value that increases as the differential voltage amplitude across the non-linear resistor increases. A transmitter may include the driver amplifier.

Abstract: An amplification device configured for amplifying a signal with a DC signal component is provided, which comprises a coupling filter circuit having an input terminal and an output terminal. The coupling filter circuit attenuates the DC signal component of an input signal to obtain a filtered output signal. The coupling filter circuit comprises a first capacitor circuit connecting the input terminal to the output terminal; a second capacitor circuit connected in parallel to the first capacitor circuit, a first resistor and a second resistor, wherein the second capacitor, the first resistor and the second resistor are serially connected; and a resistor circuit connected to the input terminal and the output terminal and comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal. The amplification device comprises an amplification circuit connected to the output terminal, which amplifies the filtered signal.

Abstract: The present disclosure relates to the field of amplifier circuits (driver amplifiers) for electro-optical modulators, in particular for amplifying an electrical signal for driving electro-optical modulators, an amplifier circuit is proposed for amplifying a signal comprising a gain amplifier, a distributed amplifier, a resistor, and a current source, wherein the input of the distributed amplifier is electrically connected to the output of the gain amplifier; the resistor terminates the input of the distributed amplifier; and the current source is electrically connected in parallel to the resistor. A method of setting a bias voltage of such an amplifier circuit is also proposed. Furthermore, a transmitter, in particular an optical transmitter, comprising such an amplifier circuit and a system comprising such a transmitter and a signal source are also proposed.

Abstract: An amplifier for converting a differential input signal to a single ended output signal. In particular, the amplifier including a converting circuit for converting a differential input signal into a single ended output signal, the converting circuit including an input section for receiving the differential input signal and an output section including an output port for providing the single ended output signal, where the output section includes a capacitive element configured to reduce an intrinsic time constant of the converting circuit.

Abstract: The invention provides a power amplifier (300) arranged to receive an input power signal (Pin) at an input port of a three port Input Power Splitter, IPS. The IPS is arranged to deliver a main input power signal (P1) to a main amplifier branch and an auxiliary input power signal (P2) to an auxiliary amplifier branch. The power amplifier (300) is arranged to deliver an output power signal (Pout) to a common node. A Phase Compensation Network, PCN, is arranged in the main amplifier branch. A Nonlinear Driver Amplifier, NDA, is arranged in the auxiliary amplifier branch. The NDA is arranged to increase the gain in the auxiliary amplifier branch. The invention also provides a corresponding method and a node in a wireless communication system comprising the power amplifier.