An all-digital PLL with a first order noise shaping Time-to-Digital Converter

Brandonisio, Francesco; Maloberti, Franco

doi:10.1109/iscas.2010.5537928

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…In [12], we proposed the first order noise shaping Local Oscillator based TDC (LO TDC) as an alternative to the GRO TDC. Figure 3(a) illustrates the block diagram of a simplified LO TDC, in which the time interval that has to be measured is the period of an input oscillator.…”

Section: Architecture Of a First Order Noise Shaping Tdcmentioning

confidence: 99%

Observations on the resolution and tones in First Order Noise Shaping Time-to-Digital Converters

Brandonisio

Kennedy

Maloberti

2011

2011 7th Conference on Ph.D. Research in Microelectronics and Electronics

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In this paper we report some observations on the resolution and tones of First Order Noise Shaping LocalOscillator Based Time-to-Digital Converters (LO TDCs). We describe the architecture and governing equations of the LO TDC. We introduce equations to predict the resolution of the system "LO TDC plus moving average filter" and the frequency and amplitude of the largest amplitude tone in the spectrum of the TDC output when the input is constant. We describe briefly the block diagrams of a Matlab model of the LO TDC and its implementation on an FPGA. Finally, we compare analytical predictions of the amplitude and frequency of the largest tone in the spectrum with simulations and experimental results. The prediction of the powers and positions of the tones in the TDC output spectrum is fundamental for the design of the system in which the TDC has to be used.

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Section: Architecture Of a First Order Noise Shaping Tdcmentioning

confidence: 99%

Observations on the resolution and tones in First Order Noise Shaping Time-to-Digital Converters

Brandonisio

Kennedy

Maloberti

2011

2011 7th Conference on Ph.D. Research in Microelectronics and Electronics

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“…In [12], we proposed the first order noise shaping Local Oscillator based TDC as an alternative to the GRO TDC. In the LO TDC, the oscillator is never disabled and the time intervals to be measured are consecutive.…”

Section: Architecture Of the First Order Noise Shaping Lo Tdcmentioning

confidence: 99%

“…8. Block diagram of the experimental setup and circuit implemented on models proposed in [12]. Figure 7 shows the input-output FPGA.…”

Section: Fpga Implementationmentioning

confidence: 99%

First Order Noise Shaping Local-Oscillator Based Time-to-Digital Converter

Brandonisio

Kennedy

Maloberti

2010

2010 17th IEEE International Conference on Electronics, Circuits and Systems

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This paper presents a First Order Noise Shaping Local-Oscillator Based Time-to-Digital Converter (LO TDC). The architecture and governing equations of the LO TDC are described. In order to show the effect of noise shaping on the resolution of the TDC, the system "LO TDC plus moving average filter" is introduced. An equation to predict the resolution of the system "LO TDC plus filter" is given. Then, the Matlab model of the system "LO TDC plus filter" is illustrated briefly, and some example of simulated input-output characteristics are shown. Afterwards, the implementation of the LO TDC on an FPGA is described. A comparison between the predicted, simulated and measured values of the resolution of the system "LO TDC plus filter" is reported. Finally, we show spectra of the output signals of the LO TDC from experiments and simulations.

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“…Kim et al [25] use stochastic phase interpolation to achieve a very good resolution and 10-bit range, at the expense of huge area allocated mainly for 2 10 delay units. Noise-shaping TDCs mainly based on a ring oscillator [22]- [24], [27], [28] and [5], [14]- [17], [26] are quite popular for fine resolution and large range, e.g., 13 ENOB with 6 ps resolution [17], but their measurement accuracy still suffers from process, voltage and temperature (PVT) variations.…”

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confidence: 99%

An On-Chip Self-Characterization of a Digital-to-Time Converter by Embedding it in a First-Order <inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$ </tex-math> </inline-formula> Loop

Chen

Huang

Chen

et al. 2018

IEEE Trans. Circuits Syst. I

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To characterize an on-chip programmable delay in a low-cost and high-resolution manner, a built-in self-test based on a first-order time-to-digital converter with self-calibration is proposed and implemented in TSMC 28-nm CMOS. The system is self-contained, and only one digital clock is needed for the measurements. A system self-calibration algorithm is proposed to calibrate nonlinearities of the analog circuitry. The operation is robust over PVT variations since the delay information is normalized to the input clock period. To verify the proposed idea, two different digital-to-time converters performing the on-chip delay are measured and analyzed at 50-MHz clocking frequency with 0.65-ps standard time deviation per measurement. Index Terms-Digital-to-time converter (DTC), time-to-digital converter (TDC), buit-in selft-test (BIST), first-order delta-sigma modulator, noise shaping, self calibration, PLL.

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An all-digital PLL with a first order noise shaping Time-to-Digital Converter

Cited by 7 publications

References 6 publications

Observations on the resolution and tones in First Order Noise Shaping Time-to-Digital Converters

Observations on the resolution and tones in First Order Noise Shaping Time-to-Digital Converters

First Order Noise Shaping Local-Oscillator Based Time-to-Digital Converter

An On-Chip Self-Characterization of a Digital-to-Time Converter by Embedding it in a First-Order <inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$ </tex-math> </inline-formula> Loop

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