Low phase noise, high resolution digitally-controlled ring oscillator operating at 2.2GHz

Selvaraj, Santthosh; Bayram, Erkan; Negra, Renato

doi:10.1109/mocast49295.2020.9200272

Cited by 4 publications

(1 citation statement)

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“…The control bits for the DAC can be directly obtained from the digital loop filter (DLF) or via a decoder. Obtaining the control bits directly from the DLF improves the resolution of the DCO to 6.10 kHz [7].…”

Section: Dac-based Dcomentioning

confidence: 99%

Comparison of System-Level Design Approaches on Different Types of Digitally-Controlled Ring-Oscillator

2021

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This paper presents a comparative study between two different implementations of digitally-controlled-oscillators (DCOs), whcih is the DAC-based and the digital controller-based DCO in TSMC 65 nm CMOS technology. This paper focuses on ring-oscillator architectures due to their high stability against PVT. The DAC-based oscillator implements a differential architecture, and the digital controller-based architecture operates in a single-ended signal. The SFDR of the DAC-based DCO is 77.2 dBc and controller-based DCO is 56.8 dBc at 125 MHz offset. The Monte-Carlo simulation gives a deviation of 7.4% and 8.5% for the DAC-based and controller-based DCO, respectively. The phase noise performance of the DAC-based DCO and controller-based DCO is −78.9 dBc/Hz and −81.3 dBc/Hz at 1 MHz offset, respectively. The implementations are given and compared according to their performance based on post-layout simulation results.

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Section: Dac-based Dcomentioning

confidence: 99%