Phase-Noise Reduction of X-Band Push-Push Oscillator With Second-Harmonic Self-Injection Techniques

A low phase-noise X-band push-push oscillator using proposed feedback topology is presented in this paper. The oscillator core was implemented in a 0.18-mum CMOS process. By using a power splitter and a delay path in the feedback loop connecting the output and current source of the oscillator, a par...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2007-01, Vol.55 (1), p.66-77
Main Authors: WANG, To-Po, TSAI, Zuo-Min, SUN, Kuo-Jung, WANG, Huei
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
CMOS process
Current source
Delay
delay line
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Feedback loop
figure-of-merit
high- Q resonator
Integrated circuits
Joining processes
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Oscillators
Oscillators, resonators, synthetizers
Phase noise
Power generation
self-injection
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Stability analysis
Topology
Transconductance
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Summary:A low phase-noise X-band push-push oscillator using proposed feedback topology is presented in this paper. The oscillator core was implemented in a 0.18-mum CMOS process. By using a power splitter and a delay path in the feedback loop connecting the output and current source of the oscillator, a part of the oscillator output power injects to the oscillator itself. With the proper phase delay in the feedback loop and high transconductance of the current source, a low phase-noise oscillator is achieved. The amplitude stability and phase stability are analyzed, the phenomena of the phase-noise reductions are derived, and the device-size selections of the oscillator are investigated. The time-variant function, impulse sensitivity function, is also adopted to analyze the phase-noise reductions of the second-harmonic self-injected push-push oscillator. These theories are verified by the experiments. This self-injected push-push oscillator achieves low phase noise of -120.1 dBc/Hz at 1-MHz offset from the 9.6-GHz carrier. The power consumption is 13.8 mW from a 1.0-V supply voltage. The figure-of-merit of the oscillator is -188.3 dBc/Hz. It is also the first attempt to analyze the second-harmonic self-injected push-push oscillator
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.886912