研究目的
Investigating the electromagnetic characterization and design methodology of a sub-THz voltage-controlled oscillator (VCO) based on a push-push architecture for THz applications.
研究成果
The proposed design methodology successfully realizes a tunable sub-THz signal source with fundamental at 192 GHz and push-push at 384 GHz, achieving a peak output power of 7.6 dBm and ?7 dBm at the two output ports, respectively, with a tuning range of about 6.2% and a phase noise of approx. 80 dBc at 1 MHz frequency offset.
研究不足
The design faces challenges such as low output power, poor tunability range, stability issues, poor phase noise, and chip dimensions. The technology process limits the maximum oscillation frequency due to larger base resistance with more transistor fingers.
1：Experimental Design and Method Selection:
The VCO is designed with a differential Colpitts architecture and a common-emitter topology for good power levels and phase noise performance.
2：Sample Selection and Data Sources:
The circuit is implemented in a 130 nm SiGe bipolar technology provided by IHP foundry.
3：List of Experimental Equipment and Materials:
Keysight ADS software with the provided Process Design Kit (PDK), EM simulation tool Momentum from Keysight.
4：Experimental Procedures and Operational Workflow:
The design includes layout and interconnects simulation, optimization of transmission lines, and final validation in Cadence Environment.
5：Data Analysis Methods:
Output power and frequency tuning range are measured, and phase noise is analyzed.
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