A Wide Range PLL Using Self-Healing Prescaler/VCO in CMOS

نویسنده

  • K. Archana
چکیده

A phase locked loop [4] is a control system that generates an output signal whose phase is related to the phase of an input signal. PLL is a feedback system that combines a voltage controlled oscillator (VCO) [4] and a phase comparator so connected that the oscillator maintains a constant phase angle relative to a reference signal. PLLs are used to generate a stable output high frequency signals from a fixed low frequency signal. When a CMOS technology approaches to a nanometer scale the non-idealities such as variability and leakage current, may significantly affect the circuit performances. The process variability leads to the large variations to degrade the device matching and performances. It may result in a few dies on a wafer to meet the target performance specifications.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A 1.41–1.72 GHz sigma-delta fractional-N frequency synthesizer with a PVT insensitive VCO and a new prescaler

A 1.41–1.72 GHz fractional-N phase-locked loop (PLL) frequency synthesizer with a PVT insensitive voltage-controlled oscillator (VCO) is presented. In this PLL, a VCO with process, voltage, and temperature (PVT) insensitive bias circuit, and a divided-by-7/8 prescaler with improved multi-phase frequency divider are adopted. A novel multi-stage noise shaping (MASH) sigma-delta modulator (SDM) is...

متن کامل

Design of a Phase Locked Loop as a Frequency Multiplier Using Self Healing Circuit

High performance digital systems use clocks to sequence operations and synchronize between functional units and between ICs. The circuit performance are degraded by some factors such as variability, leakage and improper matching in the device. when this particular PLL is made in the CMOS technology, it will lead to some leakage and variability. This paper proposes the PLL design as a frequency ...

متن کامل

A Dual-band Fractional-N Frequency Synthesizer for 2GHz and 5GHz

A new dual-band fractional-N frequency synthesizer is designed to support both 2GHz and 5GHz. The frequencies of two bands are synthesized by single PLL. It needs only a few additional circuits for dual band and has advantages in power and chip area. The synthesizer is composed of dual-band VCO, prescaler, 8/9 divider, PFD(phase-frequency detector), Charge Pump and LF(loop filter). 0.18um CMOS ...

متن کامل

A Monolithic 0.18μm 4GHz CMOS Frequency Synthesizer

A 4 GHz PLL (phase-locked loop)-type frequency synthesizer has been implemented in the standard 0.18μm mixed-signal and RF 1P6M CMOS technology. It integrates a VCO, a dual-modulus prescaler, PFD, a charge pump, a control logic, various digital counters and digital registers onto a single chip. With the help of the linear model of the loop, the design and optimization of the loop parameters are...

متن کامل

A Fast-Locking Analog PLL With Deskew Buffer

In this paper, PLL are most frequently used for Local Oscillator (LO) signal generation in wireless radio transceivers to down convert the carrier frequency to lower or intermediate frequency . The input reference frequency is 6.4 MHz. The architecture used for the design of Frequency synthesizer was Integer-N architecture. This was designed using 0.25 μm technology. The VCO designed was a CMOS...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2015