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PA-FLRTRX is a term-long project for my second year Hardware Design & Communication course which is still in progress.
The design of a transmitter frequency (TX) power amplifier and bandpass filter, which is an important subsystem in the flexible radio transceiver (FLRTRX) (Figure 1). The FLRTRX is the hardware portion of a software-defined radio system (SDR) and is designed to transmit and receive high-frequency band signals. The subsystem’s main purpose is to amplify the power of mixed output TX signals to drive the transmission of the antenna while keeping the signals’s clarity.
Figure 1. Flexible radio transceiver block diagram
The TX Power Amplifier (PA) and Filter are fundamental to the SDR system's ability to ensure the signal is strong enough for transmission while maintaining its integrity. It is designed to receive two primary inputs: a modulated RF signal from Subsystem D (TX Quadrature Mixer) and an active-low transmit-enable signal (LVTLL). (Fig.2) Upon receiving the modulated signal, the power amplifier boosts this signal to a specified output power range between 1W and 10W and is tailored to a 50-Ohm resistive load. This amplification should be meticulously controlled to ensure the Total Harmonic Distortion (THD) remains below 10%, a parameter crucial for preserving the signal's integrity and ensuring compliance with communication standards. Thus, incorporating a filter after the Power Amplifier is vital for eliminating harmonic frequencies, ensuring that the amplified signal remains clean and within regulatory bounds [1]. At last, the signal is permitted to be sent to the antenna when LVTLL is below the threshold voltage.
Figure 2. Subsystem E Block Diagram
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