Capacitive Degeneration in LC-Tank Oscillator for DCO Fine-Frequency Tuning

Fanori, Luca; Liscidini, Antonio; Castello, R.

doi:10.1109/jssc.2010.2077190

Cited by 54 publications

(25 citation statements)

References 9 publications

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“…Both I osc and I inj are digitally controlled and therefore the DCO gain (Hz/LSB) and the linear FM tuning range can be scaled according to the desired application. This is the strongest feature of this architecture when compared to [4], [7], [8], and [11]. However, the linear FM range is inversely proportional to Q which has to be high (i.e., for reasonable phase noise performance and consequently I r has to be scaled to achieve the desired tuning range.…”

Section: Proposed Solutionmentioning

confidence: 99%

“…However, the reported frequency resolution of 270 kHz is not adequate for most wireless applications. This issue was addressed in [8], which achieves very fine frequency resolution with capacitive degeneration while avoiding the need for the ΣΔ dithering. Compared to [7], that architecture can achieve a resolution of 150 Hz and total tuning range of 12 MHz.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

Bashir

Staszewski

Balsara

2016

IEEE J. Solid-State Circuits

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We propose a digitally controlled injection-locked RF oscillator with an auxiliary loop as an alternative to the conventional capacitive fine-tuning of an LC-tank. The oscillator is injection locked to a time-delayed version of its resonating voltage and its frequency is modulated by manipulating the phase and amplitude of injected current. The injection strength can be programmed for the DCO step size to be as fine as 9 kHz at 4 GHz. Alternatively, with large injection strength, the tuning range can reach up to 200 MHz. The proposed oscillator is experimentally verified in TSMC 40 nm digital CMOS.Index Terms-All-digital PLL (ADPLL), digital phase rotator (DPR), digital-to-frequency converter (DFC), digitally controlled delay (DCD), digitally controlled oscillator (DCO), multi-stage noise ΣΔ (MASH).

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Section: Proposed Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

Bashir

Staszewski

Balsara

2016

IEEE J. Solid-State Circuits

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“…One approach is to connect the FCEs across the sources of the DCO's cross-coupled transistors [24], [59]. Another approach is to inductively couple the FCEs to the DCO tank [30].…”

Section: B Fine Frequency Control Elementsmentioning

confidence: 99%

“…Another approach is to inductively couple the FCEs to the DCO tank [30]. Both approaches enable very small minimum frequency steps, e.g., as low as 150 Hz in [59]. Furthermore, compared to connecting the FCEs in parallel with the DCO tank, the techniques offer improved FCE matching because they use larger FCEs for any given minimum frequency step.…”

Section: B Fine Frequency Control Elementsmentioning

confidence: 99%

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

Venerus

Galton

2015

IEEE J. Solid-State Circuits

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This paper presents the first published fully-integrated digital fractional-PLL based on a second-order frequency-to-digital converter (FDC) instead of a time-to-digital converter (TDC). The PLL's quantization noise is nearly identical to that of a conventional analog delta-sigma modulator based PLL ( -PLL). Hence, the quantization noise is highpass shaped and is suppressed by the PLL's loop filter to the point where it is not a dominant contributor to the PLL's output phase noise. However, in contrast to a -PLL, the new PLL has an entirely digital loop filter and its analog components are relatively insensitive to non-ideal analog circuit behavior. Therefore, it offers the performance benefits of a -PLL and the area and scalability benefits of a TDC-based digital PLL. Additionally, the PLL's digitally controlled oscillator (DCO) incorporates a new switched-capacitor frequency control element that is insensitive to supply noise and parasitic coupling. The PLL is implemented in 65 nm CMOS technology, has an active area of 0.56 mm , dissipates 21 mW from 1.0 and 1.2 V supplies, and its measured phase noise at 3.5 GHz is 123, 135, and 150 dBc/Hz at offsets of 1, 3, and 20 MHz, respectively. The PLL's power consumption is lower than previously published digital PLLs with comparable phase noise performance.

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“…24,[29][30][31][32] The third technique is using a digitalto-analog converter (DAC) to generate an analog control voltage to tune the MOS varactor. 6,33 The purpose of this paper is to provide an overview of LC-based DCOs with high frequency resolution. A traditional LC-based DCO and high frequency resolution DCOs are presented with the discussion of structures and methods.…”

Section: Introductionmentioning

confidence: 99%

A Review of LC-Based Digitally Controlled Oscillator with High Frequency Resolution

Huang

Wang

Chen

et al. 2015

J CIRCUIT SYST COMP

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In 2003, a digitally controlled oscillator (DCO) for cellular mobile phones was¯rst proposed and demonstrated, and after that DCOs are widely used along with the rapid development of wireless communications. DCOs based on LC structure gain an advantage over ring oscillators in phase noise and thereby become research hotspot during the last decade. This paper presents a review of inductance capacitance (LC)-DCOs classi¯ed by circuit topologies and performance. For each DCO structure, the principle exposition and performance analysis are given in detail. Moreover, a comparison among all kinds of DCOs mentioned in this paper is presented in tabular form. Finally, we discuss the obstacle to the development of DCOs and the possible tendency for future work in summary.

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Capacitive Degeneration in LC-Tank Oscillator for DCO Fine-Frequency Tuning

Cited by 54 publications

References 9 publications

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

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

A Review of LC-Based Digitally Controlled Oscillator with High Frequency Resolution

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