Problem
Research questions and friction points this paper is trying to address.
envelope shaping
phase tuning
sub-THz wireless
phased-array
high-speed transmission
A 140-GHz Direct Raised-Cosine Envelope-Shaping Transmitter with Integrated ILO Phase Shifter
🤖 AI Summary
This work proposes a 140-GHz transmitter architecture fabricated in 90-nm SiGe BiCMOS technology that overcomes the limitations of conventional millimeter-wave transmitters, which rely on high-speed digital-to-analog converters (DACs) and baseband pulse-shaping filters, thereby struggling to simultaneously achieve high data rates, low sidelobe radiation, and fine phase control required for phased arrays. The proposed design innovatively integrates direct RF multilevel envelope synthesis—approximating a raised-cosine waveform—with an injection-locked oscillator (ILO)-based phase-shifting path, eliminating the need for high-speed DACs and baseband filtering. It supports an 8 Gbps data rate, achieves 34 dB of sidelobe suppression, offers 22.5° digital phase resolution, enables continuous analog tuning beyond 360°, and delivers up to 2 dBm output power, presenting an efficient and scalable solution for phased-array systems.
📝 Abstract
A 140-GHz transmitter with direct raised-cosine-like envelope shaping and wide-range phase tuning is presented in 90-nm SiGe BiCMOS. The proposed architecture relaxes conventional baseband pulse shaping and high-speed digital-to-analog converters by directly synthesizing 3-level and 5-level RF envelope states that approximate a raised-cosine waveform, enabled by a 23-dB modulation dynamic range. Measured results demonstrate data rate up to 8 Gbpers with 34-dB sidelobe suppression. To support scalable phased-array applications, an injection-locked-oscillator phase-tuning path is also integrated, providing 22.5deg digital phase resolution together with continuous analog tuning over more than 360 deg. The transmitter achieves up to 2 dBm output power and combines direct RF envelope shaping with wide-range fine phase control for sub-THz wireless links
Innovation
Methods, ideas, or system contributions that make the work stand out.
direct RF envelope shaping
raised-cosine approximation
injection-locked oscillator (ILO)
wide-range phase tuning
sub-THz transmitter
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