Feedback systems are important in applications, for example, optical feedback lasers, phase-locked frequency synthesizers and wave equations with feedback stabilization at the boundary, and the problem regarding sensitivity and robustness of the feedback system with respect to time delays has attracted a lot of attention. In this paper we continue the discussion on sensitivity and robustness of...

A 0.8-V CMOS Phase-Locked Loop (PLL) has been designed and fabricated by using a 0.13-μm 1p8m CMOS process. In the proposed PLL, the double-positive-feedbacks voltage-controlled oscillator (DPF-VCO) is used to generate current signals for the coupling current-mode injection-locked frequency divider (CCMILFD) and currentinjection current-mode logic (CICML) divider. A short-pulsed-reset phase fre...

A novel self-timed communication protocol is based upon phase-modulation of a reference signal. The reference and the data are sent on the same transmission lines and the data can be recovered observing the sequence of events on the same lines. The sender block consists of a reference generator and variable-delay elements, while the receiver includes a delay-locked loop for synchronization and ...

A low-power and high-speed frequency multiplier for a delay-locked loop-based clock generator is proposed to generate a multiplied clock with different range of frequencies. The modified edge combiner consumes low power and achieves a high-speed operation. The proposed frequency multiplier overcomes a deterministic jitter problem by reducing the delay difference between positiveand negative-edg...

Photonic integration is very promising to bring down volume and weight of phased-array beamforming networks. In addition, photonics allows for increased functionality for widebandwidth systems. In this paper we demonstrate the feasibility of phase and amplitude control of a 16-element phased-array antenna with a single InP integrated circuit. The concept and design of an optical phase locked lo...

A monolithically integrated p-i-n r HBT photoreceï er was successfully employed in a de ̈elopment platform for hybrid optical ( ) phase-locked loops OPLLs . Despite loop delay compromises necessary for flexibility in component substitution, this OPLL de ̈elopment platform has demonstrated a hold-in range of 1.558 GHz and possible locking frequencies from 1.00 to 20.75 GHz. Q 1997 John Wiley & Son...

The bandwidth and performance of optical phase-lock loops (OPLLs) using single-section semiconductor lasers (SCLs) are severely limited by the nonuniform frequency modulation response of the lasers. It is demonstrated that this restriction is eliminated by the sideband locking of a single-section distributed-feedback SCL to a master laser in a heterodyne OPLL, thus enabling a delay-limited loop...

We propose a piezoelectric transducer-(PZT-) based optoelectronic frequency synchronizer to control simultaneously change in the repetition rate, the relative pulse delay, and the phase noise of a passively mode-locked femtosecond Ti:sapphire laser with an intracavity saturable Bragg reflector absorber with respect to an electronic frequency reference. An optoelectronic phase-locked-loop-based ...

Modernized GPS and Galileo will be available to civil users at the end of this decade. Their signal structure design will bring tremendous improvement for any user compared to current GPS. One important advance, which is the focus of this paper, is the availability of data and pilot (or data-less) channels wrapped in a Quadrature Phase Shift Keying (QPSK) modulation (or similar). The presence o...