The input frequency limit of the conventional zero-crossing digital phase-locked loop (ZCDPLL) is due to the operating time of the digital circuitry inside the feedback loop. A solution that has been previously suggested is the introduction of a time delay in the feedback path of the loop to allow the digital circuits to complete their sample processing before the next sample is received. Howev...

The mobile communication is often interfered by any type of noises. The all digital phase-locked loop (ADPLL) system has been successfully used for decades in order to track the carrier phase of a frequency modulation (FM) signal. In this paper, we combine the ADPLL and the all-digital amplitude-locked loop (ADALL) system structure for modulation signals of the separation co-channel transmissio...

We propose and demonstrate a 20-ps time-to-digital converter (TDC) realized in 90-nm digital CMOS. It is used as a phase/frequency detector and charge pump replacement in an all-digital phase-locked loop for a fully-compliant Global System for Mobile Communications (GSM) transceiver. The TDC core is based on a pseudodifferential digital architecture that makes it insensitive to nMOS and pMOS tr...

Due to the nonlinear nature of the Bang-Bang phase-locked loops (BBPLLs), its transient analysis is very difficult. In this paper, new equations are proposed for expression of transient behavior of the second order BBPLLs to phase step input. This approach gives new insights into the transient behavior of BBPLLs. Approximating transient response to reasonable specific waveform the loop tran...

| We consider the design of kernels for time-frequency distributions through the phase, rather than amplitude, response. While phase kernels do not attenuate troublesome cross-components, they can translate them in the time-frequency plane. In contrast to previous work on phase kernels that concentrated on placing the cross-components on top of the auto-components, we set up a \don't care" regi...

A highly-integrated optical phase-locked loop with a phase/frequency detector and a single-sideband mixer (SSBM) has been proposed and demonstrated for the first time. A photonic integrated circuit (PIC) has been designed, fabricated and tested, together with an electronic IC (EIC). The PIC integrates a widely-tunable sampled-grating distributed-Bragg-reflector laser, an optical 90 degree hybri...

Compensating for the Doppler effect is a significant problem in low earth orbit (LEO) satellite communications. The effect of Doppler shift is that the baseband carrier signal is shifted in the frequency spectrum. This paper presents the design and analysis of a two-stage baseband carrier recovery algorithm for software-defined radio (SDR). The first-stage frequency-locked loop calculates a coa...