Wireless data transmission rates have increased significantly over the last decade and the demand continues to grow. Applications such as high-resolution video streaming require tremendous amount of data being transmitted over wireless communication channels, such as 4G or the upcoming 5G cellular networks or wireless local area networks, i.e. Wi-Fi. The demand for supporting the requirements of high data rates, robust transmissions, and power efficiency puts high constraints on the design of the transmitter of integrated communication systems. Moreover, larger effective transmission bandwidths, 160 MHz and beyond, and higher constellation orders, exceeding 1024-QAM, will impose stringent quality requirements on the linearity and the dynamics of the transmitter. In this context, the linearity, or the linear region of a system, determines how much the wanted transmitted signal can be amplified to be transmitted over a wireless channel until it suffers from nonlinear distortions, corrupting the signal properties. However, increasing the linearity of integrated transmitter architectures typically requires to spend more power, decreasing the system's power efficiency. In radio frequency (RF) wireless communication devices, the key component in terms of linearity and power-efficiency is the radio frequency power amplifier (RF-PA). Power-efficient implementations tend to nonlinear characteristics when increasing the signal gain, limiting the signal quality. Furthermore, increasing signal bandwidths exceeding 100 MHz, give rise to frequency dependent nonlinear effects, i.e. so-called memory effects. A way to overcome this limitation is to use digital signal processing techniques. The input signal to the power amplifier can be modulated by a nonlinear function such that the overall system's behavior becomes linear. This technique is called digital predistortion (DPD) and is a well-known concept to increase the linear region of RF-PAs. Hence, more power-efficient RF-PA architectures can be implemented. Another approach to increase the system's power efficiency is to utilize the advantages of integrated circuitry based on digital building blocks. Radio frequency digital-to-analog converters, so-called RF-DACs, shift the circuit complexity further to the digital domain. The RF-DAC is a key element of digital-to-RF transmitters, allowing an efficient implementation, and reducing the number of required (passive) analog circuitry. However, also the RF-DAC suffers from internal and external non-idealities, limiting the linear region of the signal amplification. This thesis presents a close-to-circuit time-domain based modeling technique, that allows to efficiently investigate the RF-DAC's (nonlinear) characteristics. In contrast to black-box approaches, the discussed concept allows to simulate and analyze dedicated non-idealities of the RF-DAC, while still providing a significant simulation time reduction compared to circuit simulators. The modeling approach is validated by comparing it to circuit simulators, typically used black-box approaches and measurements. Furthermore, this work introduces a circuit-inspired DPD method to cancel the effects of supply voltage variations on the capacitive RF-DAC. The developed DPD concept re-creates the voltage distortion on the RF-DAC's supply network and modulates the input signal such that the effects on the output signal of the RF-DAC are canceled. In contrast to typically used DPD approaches, such as the (pruned) Volterra series, or memory polynomials, the complexity of the derived concept is brought down to a feasible level, allowing to be implemented on an integrated circuit. The concept is demonstrated by applying the developed DPD methodology to two different capacitive RF-DAC architectures and comparing the performance to typically used black-box models such as the (generalized) memory polynomial. The DPD concept allows to reduce the stringent specifications of the RF-DAC's supply network while maintaining the linearity, or to improve the system's linearity by keeping the supply network performance. submitted by Stefan Trampitsch Universität Linz, Dissertation, 2020 (VLID)5469467