In conventional CMOS charge pump circuits there are some current mismatching characteristics which result in a phase offset in phase-locked loop circuits. This paper presents a new charge pump circuit after scrutinizing the deeper examination of the existing current mismatch problem. It combines an error amplifier with reference current sources to achieve good current matching characteristics a...

A low power switched-capacitor (SC) integrator based on a capacitive charge-pump (CP) is proposed. The CP integrator circuit consumes approximately a quarter of the power of a conventional SC integrator while maintaining the same thermal noise performance. Power consumption of the CP integrator is analysed and compared with a conventional parasitic-insensitive integrator. Simulation results ver...

This paper considers the stability of high order Charge Pump Phase Lock Loop (CP-PLL), proposing a novel means of identifying stable regions for such systems. Traditional design techniques are inefficient for high frequency, high order CPPLL systems. This paper proposes an accurate and efficient means of identifying stable regions for 2 and 3 order high frequency (> 1GHz) CP-PLL. Using exact no...

This paper studies the design and analysis of charge pump phase locked loops (PLLs), the components of the PLLs are analyzed briefly, with the design of a second order charge pump phase locked loops (PLLs). In the last decade a lot of works have been done about the analysis and design of PLLs. In this paper the PLLs are analyzed briefly which is used widely in communication systems and digital ...

-A PLL is a closed loop system that locks the phase of an output signal to an input reference signal. The term “lock” refers to a constant or zero phase difference between two signals. The components of PLL are the Phase Frequency Detector (PFD), the charge pump (CP), the low pass filter (LPF), and the voltage controlled oscillator (VCO). In which the charge pump has been modified in order to o...

The analysis of the behavior Charge Pump Phase-Locked Loop (CP-PLL) is a challenging task due to its mixed-signal architecture. Out two types, i.e. Current Switched CP-PLL (CSCP-PLL) and Voltage (VSCP-PLL), prior produces symmetrical pump currents, resulting in an appropriate transient performance be analyzed. loop parameters are important set gain, target frequency, assure stability system. mo...

Due to a number of desirable operational and design characteristics, CP-PLL’s (Charge Pump Phase locked loops) have, in recent years become a pervasive PLL architecture. CP-PLL architectures are exploited for a variety of applications such as on chip clock generation, CRC (clock recovery circuits) and Radio frequency synthesis applications. This paper describes a simple, digital only, minimally...

_______________________________________________________________________________ Abstract— This paper proposes a rigorous stability criterion for the 2 order digital phase locked loop (DPLL), with a charge pump phase frequency detector (CP-PFD) component. The Stability boundary is determined using piecewise linear methods to model the non-linear nature of the CP-PFD component block. It calculate...

A 3.2Gb/s clock and data recovery (CDR) circuit for a high-speed serial link without the reference clock is described. The CDR has a phase and frequency detector (PD and FD), which incorporates a half-rate bang-bang type oversampling PD and a half-rate frequency detector that can achieve low-jitter operation and improve pull-in range. The PD of oversamping method finds a phase error by generati...

A clock with low phase-noise/jitter is a prerequisite for high-performance ADCs, wireline and optical data links and radio transceivers. This paper presents a 2.2GHz clock-generation PLL. It uses a phase-detector/charge-pump (PD/CP) that sub-samples the VCO output with the reference clock. The PLL does not need frequency divider in locked state and achieves a low in-band phase noise values at l...