A new frequency offset compensation technique for the MIPI Low Latency Interface (LLI) application is proposed. The proposed clock and data recovery (CDR) circuit has a composite structure of bang-bang and oversampling phase detectors with an offset estimator. Digitally estimated frequency offset is used to determine the gain of the 2nd order digital CDR. An elastic FIFO for the oversampled mul...

A Clockand Data-Recovery (CDR) IC for a Physical Layer Controller in an Asynchronous Transfer Mode (ATM) system operating at a bit rate of 2.488Gb/s is presented. The circuit was designed and fabricated in a 0.8pm BiCMOS process featuring 13GHz fT bipolar transistors. Clock-recovery is accomplished with a Phase-Locked Loop (PLL). The PLL uses a Phaseand Frequency Detector (PFD) to increase the ...

This paper describes a novel burst-mode CDR(Clock and Data Recovery) circuit can be used in 622Mbps burst mode applications. The designed circuit is basically a PLL(Phase Locked Loop) has 2 PD(Phase Detector)s each for reference clock and NRZ type data, altered by external control signal. This CDR was fabricated in 1-poly 5-metal 0.25 μ m CMOS technology. Jitter generation, burst/continuous mod...

Bang-Bang clock and data recovery (BBCDR) circuits are hard nonlinear systems due to the nonlinearity introduced by the binary phase detector (BPD). The specification of the CDR frequency response is determined by jitter tolerance and jitter transfer. In this paper, jitter transfer and jitter tolerance of the second-order BBCDR are characterized by formulating the time domain waveforms. As a re...

In the ultra-high speed four-level pulse amplitude modulation (PAM4) optical receiver, data phase jitter is deteriorated by inter-symbol interference (ISI), level transitions and sampling clock. This paper analyzed in detail causes of jitter, then proposed a novel PAM4 clock recovery (CDR) architecture. A three-lane quarter-rate detector with majority voter was employed to suppress input caused...

Decision-feedback equalization (DFE) is explored to reduce inter-symbol interference (ISI) and crosstalks in highspeed backplane applications. In the design of clock and data recovery (CDR) circuit, embedding DFE within phase and frequency detector (PFD) enhances to recover data inherently from distorted input signals and facilitates to provide DFE with recovered clock. With PRBS15 data signali...

Introduction: The speed of serial links across copper backplanes has seen a steady rise over recent years. As data rates increase, transmission suffers from severe eye closure caused by intersymbol interference (ISI) owing to high-frequency attenuation of the copper traces drawn on PCBs, crosstalk noise between connector pins, and reflections that occur as data rates move into the microwave fre...

This paper deals with the study of the impact of power supply noise on the performance of CMOS Clock and Data Recovery (CDR) Circuits. The sensitivity of the various blocks of the dual loop CDR circuit to power supply noise is first studied and then it is demonstrated that insertion of suitable Low Dropout Regulators (LDOs) can enhance the performance of the CDR system with respect to power sup...

A new and simple bit transition detection technique for non-return-to-zero (NRZ) signals is described. The bit transition detector uses MOSFET transistor’s nonlinearity to extract return-to-zero (RZ) signals from NRZ signals. The resulting RZ signals can be used for injection-locking an oscillator, performing clock synchronization. A 10Gbps injection-locked clock and data recovery (CDR) circuit...

We describe the design and development of a high-speed 8-channel hybrid integrated optical transceiver package with Clock and Data Recovery (CDR) circuits. The package concept has been developed to be compatible with microprocessor package technology and at the same time allow the integration of low cost, high-performance optical components. A 90nm CMOS optical transceiver chip, 850nm 10Gb/s Ga...