Microgyroscope control system using a high-order band-pass continuous-time sigma-delta modulator

Dong, Yufeng; Kraft, Michaël; Hedenstierna, N.; Redman-White, W.

doi:10.1016/j.sna.2007.10.057

Cited by 38 publications

(14 citation statements)

References 24 publications

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“…High quality factors are generally required to achieve high sensitivity of the sensor (200-250 for the sense mode and 35000-45000 for the drive mode (Dong, et al, 2008)). Due to the phase shift introduced by the mechanical sensing element, a simple lead compensator needs to be included to stabilize the control loop.…”

Section: δ∑ Modulator Based Mems Gyroscope 51mentioning

confidence: 99%

“…Dong, et al, 2008), to form a band-pass Δ∑ modulator, which mirrors the CIDIFF structure with resonators as discussed in Chapter 3. A third order Δ∑ modulator based MEMS gyroscope with CIDIFF structure with resonator is shown in More Δ∑ modulator based MEMS gyroscope implementations can be found in a review paper (Kraft and Ding, 2009).…”

Section: δ∑ Modulator Based Mems Gyroscope 51mentioning

confidence: 99%

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1-Bit processing based model predictive control for fractionated satellite missions

Bai

2014

Acta Astronautica

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In this thesis, a 1-bit processing based Model Predictive Control (OBMPC) structure is proposed for a fractionated satellite attitude control mission. Despite the appealing advantages of the MPC algorithm towards constrained MIMO control applications, implementing the MPC algorithm onboard a small satellite is certainly challenging due to the limited onboard resources. The proposed design is based on the 1-bit processing concept, which takes advantage of the affine relation between the 1-bit state feedback and multi-bit parameters to implement a multiplier free MPC controller.As multipliers are the major power consumer in online optimization, the OBMPC structure is proven to be more efficient in comparison to the conventional MPC implementation in term of power and circuit complexity. The system is in digital control nature, affected by quantization noise introduced by Δ∑ modulators. The stability issues and practical design criteria are also discussed in this work.Some other aspects are considered in this work to complete the control system. Firstly, the implementation of the OBMPC system relies on the 1-bit state feedbacks. Hence, 1-bit sensing components are needed to implement the OBMPC system. While the ∆∑ modulator based Microelectromechanical systems (MEMS) gyroscope is considered in this work, it is possible to implement this concept into other sensing components.Secondly, as the proposed attitude mission is based on the wireless inter-satellite link (ISL), a state estimator is required. However, conventional state estimators will once again introduce multi-bit signals, and compromise the simple, direct implementation of the OBMPC controller. Therefore, the 1-bit state estimator is also designed in this work to satisfy the requirements of the proposed fractionated attitude control mission.The simulation for the OBMPC is based on a 2U CubeSat model in a fractionated satellite structure, in which the payload and actuators are separated from the controller and controlled via the ISL. Matlab simulations and FPGA implementation based performance analysis shows that the OBMPC is feasible for fractionated satellite missions and is advantageous over the conventional MPC controllers. V VI

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Section: δ∑ Modulator Based Mems Gyroscope 51mentioning

confidence: 99%

Section: δ∑ Modulator Based Mems Gyroscope 51mentioning

confidence: 99%

1-Bit processing based model predictive control for fractionated satellite missions

Bai

2014

Acta Astronautica

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“…The feedback signal used for nulling the sense motion contains the angular velocity information, which can be extracted with a basic synchronous baseband demodulation circuit. When a digital output must be provided, the feedback signal can be oversampled and quantized with a coarse quantizer: in this case, the closed-loop sensing interface behaves as a (electromechanical) Σ∆ modulator (Dong et al, 2008;Petkov & Boser, 2005).…”

Section: Comb Fingers Actuatorsmentioning

confidence: 99%

MEMS Gyroscopes for Consumers and Industrial Applications

Oboe¹,

Oboe²

2011

Microsensors

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“…Therefore during the past few years, gyroscopes in a closed loop controller have become so attractive. Recently, a closed loop control strategy based on delta sigma modulator has been proven to be beneficial which provides a high resolution digital output without any excess analog to digital converter [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Several architectures have been reported to date for gyroscope in closed loop controller [2,3,5,6]. In [2,5] sensing and controlling electrodes have been configured separately, but in [3,6] they have been shared by time-multiplexing.…”

Section: Introductionmentioning

confidence: 99%

A novel design of MEMS gyroscope with control capability

Yousefi

Deyhim

Aghdam

et al. 2013

2013 21st Iranian Conference on Electrical Engineering (ICEE)

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High performance MEMS gyroscopes can be implemented by embedding in a closed loop controller. For these gyroscopes, the electrostatic controlled force on the proof mass is inherently nonlinear. This study reports a MEMS gyroscope with control capability in which comb drive electrodes are employed as the controlling mechanism to linearize the electrostatic controlled force. To avoid interaction of drive and control comb drive electrodes, another mass has been added to the structure. Consequently, proposed gyroscope consists of a 2-DOF sense mode oscillator and a 1-DOF drive mode oscillator. The prototype with an overall size of 0.46 × 0.635 mm is designed to be fabricated in surface Micromachining process with 3 µm structural layer thickness. The device operation has verified by Finite Element Method simulations showing a raw mechanical sensitivity of 32 nm for drive direction oscillation amplitude of 120 nm and angular rotation of 50 [•/s].

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Microgyroscope control system using a high-order band-pass continuous-time sigma-delta modulator

Cited by 38 publications

References 24 publications

1-Bit processing based model predictive control for fractionated satellite missions

1-Bit processing based model predictive control for fractionated satellite missions

MEMS Gyroscopes for Consumers and Industrial Applications

A novel design of MEMS gyroscope with control capability

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