A Near-Threshold 480 MHz 78 µW All-Digital PLL With a Bootstrapped DCO

a high dynamic range digitally-controlled oscillator (dco) for all-digital pll systems

in this paper, a new high dynamic range digitally-controlled oscillator (dco) for all-dpll systems is proposed. the proposed dco is based on using a δς modulator as a digital-to-analog converter. using δς dac can provide a very high resolution (18-bit) control on the dco. the δς dac output is a 2-level pulse signal that needs to be filtered for cancelling the out of band shaped noise. the used ...

A Precise ΔΣ-based Digitally Controlled Oscillator (DCO) for All-Digital PLL

A Digitally Controlled Oscillator (DCO) for the frequency band of 1700-1900 MHz is presented. This architecture achieves a frequency resolution less than 1-kHz. The DCO is a part of an All-Digital Phase-Locked Loop (ADPLL) for GSM-1800 and GSM-900 applications implemented in a 0.18 μm CMOS process. In this architecture an 18-bit delta sigma digital to analog converter and a voltage controlled L...

A High Dynamic Range Digitally- Controlled Oscillator (DCO) for All-Digital PLL Systems

In this paper, a new high dynamic range DigitallyControlled Oscillator (DCO) for All-DPLL systems is proposed. The proposed DCO is based on using a ΔΣ modulator as a Digital-to-Analog converter. Using ΔΣ DAC can provide a very high resolution (18-bit) control on the DCO. The ΔΣ DAC output is a 2-level pulse signal that needs to be filtered for cancelling the out of band shaped noise. The used Δ...

Errata for "A TDC-Free Mostly-Digital FDC-PLL Frequency Synthesizer With a 2.8-3.5 GHz DCO"

All Digital Ultra-Fast Acquisition PLL

Frequency synthesizers find use in all high frequency applications such as communications, radar, digital communications, electronic imaging and spectroscopy [1]. There are three main techniques commonly used 1) PLL synthesizers based on a feedback mechanism to lock to a reference frequency. The popularity of the PLL is due to their extended tracking range and low cost. 2) Direct analog frequen...