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In this paper we propose a variable-gain transimpedance amplifier suitable for low-power applications. Its noise, bandwidth and input impedance performance are similar to a more conventional regulated-cascode common-gate transimpedance with resistive load, with the same power consumption and gain performance. The proposed amplifier has, however, variable gain, which can be easily changed by setting...
Linearity characteristics in terms of two-tone third order intermodulation distortion (IMD3) for common-emitter (CE) SiGe heterojunction bipolar transistors (HBT) are investigated at high frequency (6 GHz) with impedance matched for maximum output power. An approach to enhancing the linearity of SiGe HBTs at their high input power levels through the use of current bias instead of voltage bias is presented...
This paper expounds on power efficiency enhancement techniques that are sought for the reduction of power consumption of wireless radio frequency power amplifiers (RFPA) and transmitters. The paper will focus on advanced power amplification architectures such as doherty power amplifiers (DPA), linear amplification using nonlinear components (LINC), envelop elimination and restoration (EER) and envelope...
Legacy Doherty amplifier is characterized by using a larger transistor for the peak amplifier such that this reaches saturation with a smaller excitation signal. However due to device availability and modelling considerations, this is not often feasible. In this paper, the design and measurement of a Doherty amplifier utilizing only single sized device is realized. Unlike previous research works,...
In this paper, a RF high power Doherty feed-forward amplifier using equal group-delay canceller is proposed which provide high efficiency and high linearity also with improved group-delay performance. The Doherty amplifier takes Freescale mrf21125S N-channel Enhancement-Mode Lateral MOSFETs as the main amplifier of a feed-forward amplifier. By carefully adjust the gate bias and the phase offset line...
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