Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 69, Issue 3, Pages 1646-1653Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2020.3047661
Keywords
Differential amplifiers; Gallium nitride; mixed signal; monolithic integrated circuits; signal generators; signal reconstruction; system-on-chip
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This paper presents a low-power DAC capable of providing RF signals with data rates of up to 8Gbit/s. Experimental results demonstrate the feasibility of utilizing a constant current source in the 0.25-micron GaN technology and switching constant currents at clock frequencies of up to 2 GHz.
A low-power differential input to single-ended output digital-to-analog converter (DAC) is presented, which is capable of providing radio frequency (RF)-signals with a data rate of up to 8Gbit/s. A constant direct current (dc) current source is realized as a self-bootstrapping device in the presented 0.25-mu m in-house gallium nitride (GaN) technology. First, measurements with a low-power [1-V peak-peak voltage (V-pp)] differential input signal show the feasibility of switching constant currents with a clock frequency of up to 2 GHz. Furthermore, a 2-b DAC that uses a differential sampling to generate RF-signals is introduced. Measurement results prove the feasibility of synthesizing custom-modulated voltage waveforms with data rates of up to 8 Gbit/s in the sub-6-GHz frequency range.
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