VDD A 10 GHz CMOS distributed voltage controlled oscillator (DVCO) is designed in a 0.35pm BiCMOS process technology using only CMOS transistors. The oscillator achieves a tuning range of 12% (9.3 GHz to 10.5 GHz) and a phase noise of -1 14 dBc/Hz at 1 MHz offset from a carrier frequency of 10.2 GHz. The VCO uses two different simultaneous tuning techniques which allow for a coarse and fine I t...

Wideband and frequency-tunable microwave signal generation using an optoelectronic oscillator incorporating a Fabry-Perot laser diode (FP-LD) with external optical injection is proposed and demonstrated. Through external injection, the FP-LD functions as a tunable high-Q photonic microwave filter, and the frequency tuning is realized by either tuning the wavelength of the externally injected op...

Optical Q factor measurements are performed on a whispering gallery mode (WGM) disk resonator using a microwave frequency domain approach instead of using an optical domain approach. An absence of hysteretic behavior and a better linearity are obtained when performing linewidth measurements by using a microwave modulation for scanning the resonances instead of the piezoelectric-based frequency ...

Investigation of a microwave oscillator, synchronized by an invariant external signal has been completed A graphical method has been developed which accurately describes the operation of the locked oscillator The analysis is applied to the Rieke diagram of the tube A report on this work is now in progress It is hoped that this type of analysis may be extended to include more generalized synchro...

We present the femtosecond synchronization between an 800-nm photocathode laser and an S-band RF oscillator using an optical-RF phase detection system at KAERI-WCI Accelerator. A 79.33-MHz commercial Ti:sapphire photocathode laser oscillator is locked to a 2.856-GHz RF master oscillator (RMO) using a fiberloop-based optical-microwave phase detector (FLOMPD), which results in 13 fs (rms) out-of-...

Using microwave currents, we excite resonances of geometrically confined pinned domain walls, detecting the resonance by the rectification of the microwave current. By applying magnetic fields, the resonance frequency of the domain wall oscillator can be tuned over a wide range. Increasing the power leads to a redshift due to the nonlinearity of the system. From this frequency shift, we directl...

An optoelectronic oscillator (OEO) for arbitrary microwave waveform generation based on Fourier domain mode-locking (FDML) is proposed. A reconfigurable optical generator (OWG) implemented via external electro-optical modulation, which serves as the source proposed OEO. The from OWG can be seen a series of frequency-scanning wavelengths in frequency domain. At any instant, number 0 to infinite....

O in RF and microwave frequencies tend to be a mysterious circuit block in that their behaviors are not fully explained. In particular, designing a wide-tuning voltage controlled oscillator (VCO) still involves a lot of guesses and many printed circuit board (PCB) revisions, even with the help of today’s highly sophisticated design tools. One problem in the design process lies in the absence of...

The intensive research on ferroelectric electron-emission mechanisms in the last decade has resulted in a wide understanding of the physics and characteristics of this plasma-assisted electron source. Nevertheless, practical devices employing this cathode were hardly introduced. In this experimental study, a high-repetition-rate microwave oscillator based on a ferroelectric electron gun has bee...