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In this paper an FPGA-based System-on-Chip (SoC) implementation of a flexible digital radio is presented and evaluated. The implemented transmitter is able to perform a direct up-conversion of a baseband signal to RF operating in the gigahertz frequency range as well as it enables the simultaneous transmission of two different carriers, each one having a different modulation, bandwidth, etc. The developed...
In this letter, we present a new all-digital multichannel multimode transmitter architecture. The main novelty is the development of an agile radio transmitter where the digital up-conversion to RF operating in the gigahertz frequency range and the multichannel transmission capacity are embedded into a single field-programmable gate array device. Its high flexibility and fast switching of the carriers'...
This paper presents an end-to-end high frequency class S power amplifier. A description of the full testbench and some important points on generation of RF outputs from FPGA devices and current mode class D design are given. Experimental measurements are provided for the prototype PA consisting of a signal generator, analog to digital converter, driver circuit, current mode class D switching stage...
The term software defined radio (SDR) is usually used to refer to a radio transceiver in which its key parameters are defined in software and having its fundamental aspects reconfigurable by upgrading that software. SDR architecture has been proposed as a solution to support multiple wireless standards on a single platform. In this paper, we present the architecture of an all-digital transmitter with...
Software defined radio (SDR) is a rapidly evolving technology that is receiving enormous recognition and generating widespread interest in the telecommunication industry. In this paper, we present the architecture of an all-digital transmitter with radio frequency output targeting FPGA devices due to their reconfigurability and programmability. The all-digital transmitter directly synthesizes RF signal...
When a delta-sigma modulator (DSM) is placed before a class D switching stage the combination can be used to amplify time varying envelope signals. However a bandpass DSM is commonly employed and is required to have a sampling frequency approximately four times the carrier frequency. At RF or microwave frequencies proprietary hardware was previously needed to implement the DSM. However, it is shown...
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