A 0.4V 4.8μW 16MHz CMOS crystal oscillator achieving 74-fold startup-time reduction using momentary detuning

Lei, Ka-Meng; Mak, Pui-In; Martins, Rui P.

doi:10.1109/iscas.2017.8051002

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…The magnitude of the negative resistance can be boosted by increasing [10], [13], [16]- [19] and/or altering the load capacitance [16], [20]. However, the maximum negative resistance, and hence minimum start-up time, is limited by [10], [13], [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

Fast & Energy Efficient Start-Up of Crystal Oscillators by Self-Timed Energy Injection

Lechevallier

Zee

Nauta

2019

IEEE J. Solid-State Circuits

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Crystal oscillators take a long time and, more importantly, a significant amount of energy to start-up. This paper presents a self-timed energy injection technique to quickly startup a crystal oscillator, for a very low energy consumption. This is achieved without a power-hungry oscillator to provide the injection signal. The design considerations are discussed, and a prototype crystal oscillator using the proposed technique is integrated in a 22nm FD-SOI technology.Connected to a 50MHz crystal, the manufactured IC achieves a start-up time of 6 s, for an energy consumption of just 3.7 nJ.

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Section: Introductionmentioning

confidence: 99%

Fast & Energy Efficient Start-Up of Crystal Oscillators by Self-Timed Energy Injection

Lechevallier

Zee

Nauta

2019

IEEE J. Solid-State Circuits

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“…Such a Pierce oscillator is widely used because it has a simple topology and can meet the oscillation conditions relatively easily. In addition, various methods have been proposed to speed up the startup [5] - [25]; they are possible to be employed as well.…”

Section: Basic Concept Of Proposed Oscillatormentioning

confidence: 99%

“…To solve this issue, several methods have been proposed to shorten the startup time of a crystal oscillator [4]. Generally, there are three methods: in [5]- [11], the negative resistance |RN| of the oscillating circuit is increased; in [12]- [22] the initial current |iM(0)| is exaggerated by injecting frequency components near the oscillation frequency; in [23]- [25], the load capacitance CT decreased. These techniques have successfully reduced the startup energy down to several tenths.…”

Section: Introductionmentioning

confidence: 99%

A Quick Startup Low-Power Hybrid Crystal Oscillator for IoT Applications

Miyahara¹,

Ishii

et al. 2023

IEICE Trans. Electron.

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In this paper, we propose a hybrid crystal oscillator which achieves both quick startup and low steady-state power consumption. At startup, a large negative resistance is realized by configuring a Pierce oscillating circuit with a multi-stage inverter amplifier, resulting in highspeed startup. During steady-state oscillation, the oscillator is reconfigured as a class-C complementary Colpitts circuit for low power consumption and low phase noise. Prototype chips were fabricated in 65nm CMOS process technology. With Pierce-type configuration, the measured startup time and startup energy of the oscillator are reduced to 1/11 and 1/5, respectively, compared with the one without Pierce-type configuration. The power consumption during steady oscillation is 30 μW.

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“…On the other hand, Equation (2.1) shows that the use of a larger 𝐶𝐶 𝐿𝐿 increases the maximum achievable negative resistance, reducing overall start-up time. This is analyzed in circuit simulations in [25]. The disadvantage, however, is that the required transconductance grows with the increasing 𝐶𝐶 𝐿𝐿 , as shown in Equation (2.3), thereby increasing power consumption.…”

Section: Altering Load Capacitancementioning

confidence: 99%

Efficient start-up of crystal oscillators

Lechevallier¹

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A 0.4V 4.8μW 16MHz CMOS crystal oscillator achieving 74-fold startup-time reduction using momentary detuning

Cited by 5 publications

References 7 publications

Fast & Energy Efficient Start-Up of Crystal Oscillators by Self-Timed Energy Injection

Fast & Energy Efficient Start-Up of Crystal Oscillators by Self-Timed Energy Injection

A Quick Startup Low-Power Hybrid Crystal Oscillator for IoT Applications

Efficient start-up of crystal oscillators

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