Voltage-Controlled-Oscillator Using an 8-shaped Transformer-coupled Transmission Line
- Resource Type
- Conference
- Authors
- Jang, Sheng-Lyang; Hsieh, Yi-Ping; Lai, Wen-Cheng
- Source
- 2024 IEEE 24th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) Silicon Monolithic Integrated Circuits in RF Systems (SiRF), 2024 IEEE 24th Topical Meeting on. :95-97 Jan, 2024
- Subject
- Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Engineering Profession
General Topics for Engineers
Photonics and Electrooptics
Couplings
Power transmission lines
Magnetic field measurement
Voltage-controlled oscillators
Transformers
Transmission line measurements
Magnetic fields
voltage-controlled oscillator (VCO)
s-shaped transformer-coupled transmission line
magnetic field coupling
- Language
- ISSN
- 2474-9761
This letter presents a 3:1 8-shaped transformer used to form an 8-shaped transformer-coupled transmission line consisting of four back-to-back connected transformers. The stacked transformers form a closed loop. By placing cross-coupled inverter pairs in the loop, a VCO is built. The die area of the VCO in the TSMC 0.18 $\mu$m CMOS process is $1.2\times 1.2$ mm 2 . The measured phase noise of the eight/four-phase VCO at 5.43 GHz is −114.82 dBc/Hz and the VCO figure of merit (FOM) is −180.128 dBc/Hz. The wave on the loop is a traveling wave. The 8-shaped transformer reduces magnetic field coupling and limits the Electro-Magnetic Compatibility (EMC) issue.