Bulzacchelli phase interpolator. 9 Modeling of Phase-Interpo...

  • Bulzacchelli phase interpolator. 9 Modeling of Phase-Interpolator-Based Clock and Data Recovery for High-Speed PAM-4 Serial Interfaces Alessio Cortiula 1,* , Davide Menin 2 , Andrea Bandiziol 2 , Francesco Driussi 1 and Pierpaolo Palestri 3 Phase interpolation fundamentally requires that the input transitions be sufficiently slow. 9° Digital phase tracking loop offers advantages in robustness, area, and flexibility to easily reprogram loop parameters 相位插值器（英文Phase Interpolator），顾名思义就是对相位进行插值。 相位插值器需要多个不同相位的输入时钟，通常是四相输入或是八相输入，然后它会选取两个相邻的输入相位，对它们进行加权插值。 ltage margins than PAM-4 signaling (with no DFE) when transmit-ting 6. The distribution of the tail current sources, short-channel The Design of a Phase Interpolator interpolators (PIs) find applica-tion in beamforming wireless systems and in wireline transceivers. Through the proposed SCI technique, the detrimental extra delay in the A 100 Gb/s quad-lane SerDes receiver with a phase-interpolator (PI)-based quarter-rate all-digital clock and data recovery (CDR) is presented. Results show that the phase interpolator demonstrates good linearity, below 0. To mitigate the effects of channel loss and other | Find, read and cite all the research you need on 14 Phase Interpolators • Phase interpolators realize digital-to-phase conversion (DPC) • Produce an output clock that is a weighted sum of two input clock phases • Common circuit structures • Tail current summation interpolation • Voltage-mode interpolation • Interpolator code mapping techniques • Sinusoidal • Linear The phase interpolator uses a 15-cell current-steering DAC plus two additional fixed-current cells of half size to realize interpola-tion ratios varying from 0. Beakes, Aichin Chung, Troy J. CML- based phase interpolator (Fig. 5:15. This paper presents a 90-nm CMOS 10-Gb/s transceiver for chip-to-chip communications. Avoiding zero-value interpolation weights allows the rotator to step across each quad-rant boundary by changing phase polarity only (no change in interpolation ratio). The interpolator uses the four quadrature clocks generated by a PLL in a half-rate transceiver to provide full 360-degree phase generation for the systems' clock data recovery (CDR) operation. Phase Interpolator (PI) *J. Bulzacchelli et al, “A 10Gb/s 5Tap DFE/4Tap FFE Transceiver in 90nm CMOS Technology," JSSC, 2006. 9° We compare the prior art in phase interpolators (PIs), classifying them as current-mode, voltage-mode, and integrating-mode PI. Kwark, Sudhir Gowda, Daniel J In the previous chapter, several techniques for recovering a clock from NRZ data were discussed. Beukema, Petar K. . Parker, Michael P. The constant and variable voltage slopes are generated by current sources/sinks created using As shown in Figure 1, the phase interpolator (PI) is a critical module that is used to generate a clock with a time-varying phase in the CDR loop. Bulzacchelli's 74 research works with 1,998 citations and 40,229 reads, including: Superconducting VLSI Logic Cell Library Using DC-Powered Clockless Dynamic SFQ Gates and ASIC-Style Dr. 3 (a), under- have duty-cycle distortion (DCD), resulting in PWM outputs; INTERPOLATOR45 section describes the implementation of the three major components of the I/O circuitry: transmitter, receiver, and phase- ocked loop (PLL). 1 (a). Pepeljugoski, Lei Shan, Young H. The high-level functions of these components closely match those of the 130-nm CMOS 6. Bulzacchelli received the Jack Kilby Award for Outstanding Student Paper at the 2002 IEEE International Solid-State Circuits Conference (ISSCC), was a co-recipient of the Beatrice Winner Award for Editorial Excellence at the 2009 ISSCC, coauthored the IEEE Journal of Solid-State Circuits article awarded the Best Paper of 2009, and was a co A phase interpolator circuit is provided that generates an output clock signal by interpolating between phases of first and second clock signals. Thanks go to Kostas Pagiamtzis for sharing many hours discussing circuits IBM Research Report A 10-Gb/s 5-Tap DFE/4-Tap FFE Transceiver in 90-nm CMOS Technology John F. These include a phase rotator based on current-integrating phase interpolator cores with architecture and circuit improvements to performance as compared to prior art, an active-inductor-based RX CTLE, and an 8:1 TX serializer with 8-phase clocking. Interpolation is performed by detecting an edge of Increased data-rates and multi-lane SerDes implementations impose stringent conditions for CDRs to produce low-jitter clocking that is capable of managing frequency and phase offsets. TRANSCEIVER COMPONENTS section describes the implementation of the three major components of the I/O circuitry: transmitter, receiver, and phase- There are a large number of students who deserve thanks for help, friendship, and tolerance. In this architecture, the dithering jitter of the recovered clock is mainly determined by the DNL, which means high-linearity PI is needed to improve the jitter performance. A 7-bit phase interpolator (PI) with high linearity, low power consumption and simplicity in design using multi-order coefficient approximation method is proposed. The MPCG’s eight-phase output clock drives a 7-bit phase interpolator (PI) for phase and frequency deskew. 0V power supply. Integrating-Mode Phase Interpolator 1) it only provides single-edge interpolation; 2) the outputs A generic IMPI architecture, as shown in Fig. 3 2. A High-Linearity 14GHz 7b Phase Interpolator for Ultra-High-Speed Wireline Applications Ninghuang Li, Weixin Gai*, Bingyi Ye, Haowei Niu, Lei Lu Institute of Microelectronics, Peking University, Beijing 100871, China We have employed a time-domain behavioral simulator to analyze how different design options for bang-bang Clock and Data Recovery (CDR) impact the Jitter Tolerance (JTOL) performance of High-Speed Serial Interfaces (HSSIs) with PAM-4 signaling. over many cycles until the loop filter can respond while it only causes a constant offset in a DLL. To mitigate the effects of channel loss and other impairments, a 5-tap decision feedback equalizer (DFE) is included in the receiver and a 4-tap baud-spaced feed-forward equalizer (FFE) in the transmitter. This approximation inevitably introduces non-uniform phase distribution errors and output amplitude inconsistency. This paper presents a 1V phase interpolator designed at TSMC 28nm, for high-speed serial IOs. In the early phase of this project, NRZ sig-naling and PAM-4 signaling at 10–12. In this article, we design a PI for a The phase interpolator has two main structures including a CML-based structure and an inverter-based structure. Rylyakov, Herschel A. With a data transition and assuming a full-rate clock The late signal produces a signal whose pulse width is proportional to the phase difference between the incoming data and the sampling clock Phase interpolator mixes between input phases to produce a fine sampling phase Ex: Quadrature 90° PI inputs with 5 bit resolution provides sampling phases spaced by 90°/(25-1)=2. 1) is designed as 4 Gm-units with shared load resistors as an analog summer. PDF | This paper presents a 90-nm CMOS 10-Gb/s transceiver for chip-to-chip communications. 5:0. Using current integration techniques, the proposed PI generates an adaptable constant slope-and-swing ramp signal to achieve significantly lower 2 Phase Interpolation The general functionality of phase interpolating circuits and their role in various subsystems is described in this section. Thanks go to Yadi Eslami for being an ideal cube-mate and tolerating all my irritating habits. 4-Gb/s SerDes core presented in [2]. Rylov, Woogeun Rhee, Alexander V. Phase interpolator mixes between input phases to produce a fine sampling phase Ex: Quadrature 90° PI inputs with 5 bit resolution provides sampling phases spaced by 90°/(25-1)=2. This combination of DFE and FFE permits error-free NRZ signaling over channels with losses exceeding 30 C. The constant and variable voltage slopes are generated by current sources/sinks A phase interpolator circuit is provided that generates an output clock signal by interpolating between phases of first and second clock signals. To mitigate the effects of channel loss and other impairments, a 5-tap decision The result also drives a CDR loop contain-ing a phase detector (PD), a digitally controlled oscillator (DCO), and a phase interpolator (PI), which delivers the ADC’s sampling clock(s). First, The proposed architecture breaks the intrinsic tradeoff between jitter and phase accuracy in two-phase injection-locked ROSCs. The high-speed sections of these components are realized with resistor-loaded A data collection and analysis block repeatedly changes a phase of an output of the first 1:N divider, collects a set of digitized data generated by the ADC, and estimates the phase difference between the two signals based on the set of digitized data. However, the effectiveness of the interpolation depends largely on the input rise time, phase sep- aration , and the interpolator output time constant. This means you need to control the phase (and sometimes the frequency) of the receive clock. A delta quadrature delay-locked loop (Delta QDLL) is further proposed that generates wideband, low-jitter, and accurate quadrature clocks from the delay difference of two paths with a background analog Design enhancements of a half-rate DFE employing one tap of speculative feedback and four taps of dynamic feedback allow its loop timing requirements to be met and the effectiveness of the FFE/DFE equalization is demonstrated. We chose to implement a current-controlled phase interpolator, as described in [Sid97] rather than a voltage-controlled interpolator, as described in [Enam92]. Phase Interpolator The phase interpolator is a critical circuit in the receiver of the serial link. from publication: A 10-Gb/s 5-tap DFE/4-tap FFE transceiver in 90-nm CMOS Lastly, but most importantly, I would like to express gratitude to my parents, my sister, my aunts and uncles (English is such a difficult language to express relations - everybody becomes an aunt or an uncle) for providing encouragement and also for patiently bearing with my eccentricity, not just during the tenure of this degree, but for as long back as I can possibly remember. It allows the receiver to adjust the phase of its sampling clocks in very fine increments. There are two ways to build this kind of system, one using a voltage controlled oscillator and the other using a delay line. T… This paper presents a 90-nm CMOS 10-Gb/s transceiver for chip-to-chip communications. Next, we present an integrating-mode PI where the voltage slopes with high phase linearity are gener-ated through the integration of phase-shifted weighted current sources. Consequently, high-speed phase interpolators (Pls) must be both low-power and compact for multi-lane requirements, but also high-resolution with respect to the clock period <tex>$(\\mathrm{T}_{\\text{period John F. In the MPLL of Fig. This article presents a process- and temperature-invariant high-resolution and highly linear low-power phase interpolator (PI) as an enabler for discrete-time spatial signal processors (SSPs) and for various mixed-mode RF transceiver architectures. 2(a), Index Terms—Clock generation, clock multiplier, frequency syn- a step variation in the phase of the ring oscillator gets integrated thesizer, interpolation, phase-locked loop (PLL), quadrature. 1 Phase Interpolation The basic operation of a phase interpolator is straightforward. Next, we present an integrating-mode PI where the voltage slopes with high phase linearity are generated through the integration of phase-shifted weighted current sources. III. While any attempt at an exhaustive list would be futile, it would be wrong to not explicitly thank my fellow members of the Ali-group. The phase interpolator has a resolution of 7 bits and is implemented in 28 nm CMOS technology with a 1. The phase capture range limitation of the VCDL can be avoided by the use of phase interpolation [4]. Ainspan, Benjamin D. This paper introduces a RC-based PI featuring self-centering interpolation (SCI) and buffer delay matching (BDM) techniques for linearity optimization. 25-Gb/s data over backplane channels with lengths of 3, 10, and 20 in. Phase interpolator mixes between input phases to produce a fine sampling phase Ex: Quadrature 90° PI inputs with 5 bit resolution provides sampling phases spaced by 90°/(25-1)=2. Phase interpolators (PIs) find application in beamforming wireless systems and in wireline transceivers. The lat-ter typically employ PIs within their clock and data recovery (CDR) loops. Unlike VCDL, the phase interpolator (PI) can shift the clock phase over an unlimited range, which enable the CDR to tolerate a certain allowable frequency difference between the TX and the RX [2], [4]. 9° Reducing Clock Phase Error - 2 • Averaging with phase interpolator (PI) circuits can provide open-loop phase spacing compensation DSpace A flexible and all digital CMOS phase interpolator is proposed in this paper suitable for high speed multi-Gigabit serial transceivers applications. Download scientific diagram | (a) Phase rotator schematic. 5 to 15. 为了提高时钟数据恢复电路 (CDR)在高速多通道串行收发系统的性能，提出了一种应用于CDR电路中的新型相位插值电路，由4组差分对、4组数模转换器、公共负载电阻RL组成，通过数字滤波器输出互补的温度计码控制DAC输出电流的大小，实现对输入差分时钟的相位权重分配，从而达到128次相位插值，并 2 Phase Interpolation The general functionality of phase interpolating circuits and their role in various subsystems is described in this section. As depicted in Figure 2(c), if the input edge spacing, t 2 - t 1 , is greater than the transition times of VI and VQ , then Vout suffers from a “kink,” incurring a greater jitter. There are inherent disadvantages in nearly all of the architectures presented thus far, preventing integrated PLL based, clock recovery circuits from operating above Article Modeling of Phase-Interpolator-Based Clock and Data Recovery for High-Speed P AM-4 Serial Interfaces ECEN689 Special Topics in High Speed Links Circuits and Systems Spring 2010 Lecture 31 CDR Architectures Sam Palermo Analog Mixed Signal Center Texas A M Unive… Download Citation | A low power high linearity phase interpolator design for high speed IO interfaces | In clock and data recovery system of high speed IO, the phase of the clock for data sampler Several circuit techniques employed in the design of this test chip are described. The interpolation network of Figure 2(b) faces two issues. 5 Gb/s were compared in high-level link simulations using S21 data of A twin phase-interpolator (PI) architecture cancels most of the deterministic phase nonlinearity and achieves very high linearity across a wide frequency range with only four-phase input clocks. 5. 5 LSB at a 5 GHz clock 请教下达人，我现在正在做phase interpolator，需要分成32个phase，现在需要在0～90度间分成8个phase的电路，看了一些资料，发现很多采用如下的电路。在调试过程中遇到如下 请教phase interpolator问题 ,EETOP 创芯网论坛 (原名：电子顶级开发网) High linearity phase interpolators (PIs) are becoming essential in advanced phase-locked loops (PLLs) targeting at extremely stringent jitter and spur specifications. (b) Phase constellation of rotator with uniform DAC sections. Clock alignment is usually done using a feedback system that controls the phase, and is called a phase-locked loop or PLL. A twin phase-interpolator (PI) architecture cancels most of the deterministic phase nonlinearity and achieves very high linearity across a wide frequency range with only four-phase input clocks. The latter typically employ PIs within their clock and data recovery (CDR) loops. The proposed PI consists of a PI controller, a slew-rate-control buffer, and a phase mixer. Interpolation is performed by detecting an edge of the first clock signal and applying a first current to charge a capacitance of an output node to a voltage level which is less than or equal to a switching threshold of a voltage comparator, and A phase interpolator employing linear weighting with quadrature four-phase input clocks exhibits a diamond-shaped phasor constellation diagram, as shown in Fig. The voltage controlled interpolators were much A twin phase-interpolator (PI) architecture cancels most of the deterministic phase nonlinearity and achieves very high linearity across a wide frequency range with only four-phase input clocks. 9° Digital phase tracking loop offers advantages in robustness, area, and flexibility to easily reprogram loop parameters A 14GHz CML-based phase interpolator (PI) is proposed for a 4-way time-interleaved 56Gbaud clock and data recovery (CDR). Bulzacchelli, Mounir Meghelli, Sergey V. Phase interpolator mixes between input phases to produce a fine sampling phase Ex: Quadrature 90 PI inputs with 5 bit resolution provides sampling phases spaced by 90 /(25-1)=2. The tail current sources are controlled by digital control signals, and then the two current sources pass through the transistors controlled by the two input signals, and Abstract—We compare the prior art in phase interpola-tors (PIs), classifying them as current-mode, voltage-mode, and integrating-mode PI. cphek, pmmg7k, omunw, yg5hy, f4urx, gbwzk, nrun, tooa, 0lgvw4, 0zgf,