Journal ArticleDOI
Oscillator-Less Direct-Digital Front-End Realizing Ratiometric Linearization Schemes for TMR-Based Angle Sensor
Reads0
Chats0
TLDR
A simple oscillator-less direct-digital front end (ODF) for tunneling magnetoresistance (TMR) angle sensor is presented and a close degree of agreement was observed between the emulation results and the mathematical analysis performed.Abstract:
A simple oscillator-less direct-digital front end (ODF) for tunneling magnetoresistance (TMR) angle sensor is presented in this paper. The TMR sensor outputs vary as sine and cosine functions of the shaft angle to be measured. To these outputs, the ODF applies ratiometric-based techniques to obtain a linear output for the full-circle range. The first ratiometric linearization scheme (RLS-A) provides a linear output which is insensitive to the variation of sensor transformation constant. Alternatively, the second ratiometric linearization scheme (RLS-B) renders output with minimal nonlinearity (0.009%). The ODF does not require any sinusoidal oscillator for its operation, thereby eradicating one major error source. Furthermore, the proposed methodology uses dc excitation for the sensor. This makes the ODF insensitive to the sensor parasitic capacitances. The operation of the ODF and two linearizing schemes are explained in detail. Mathematical evaluation of the schemes is conducted to determine the effects of different sensor and circuit nonidealities. The static and dynamic performances of the ODF are studied using emulated TMR sensor outputs. The results establish a linear transfer-characteristic over 360° range. Tests are also conducted to quantify the effect of nonidealities like phase imbalance in sensor outputs and deviation in sensor transformation-constant. A close degree of agreement was observed between the emulation results and the mathematical analysis performed. Later, the ODF is interfaced and tested with a prototype TMR-based shaft-angle measurement unit. The interfacing results underline the fact that the developed ODF acts as an efficient linearizer for TMR angle sensors.read more
Citations
More filters
Journal ArticleDOI
A Novel Linearizing Signal Conditioner for Half-Bridge-Based TMR Angle Sensor
TL;DR: In this article, a signal conditioning circuit for half-bridge topology based tunneling magneto-resistance (TMR) angle sensor is proposed, which employs an enhanced dual-slope technique to process these non-linear resistance variations and render a linear digital output for full-circle range.
Journal ArticleDOI
Performance Investigation of a Simplified TMR-Based Rotary Position Sensing System
TL;DR: In this paper, a rotary position-sensing system (TRPS) using tunneling magneto-resistance (TMR) sensing technique is proposed to measure the angular position of a rotating shaft.
Journal ArticleDOI
An Improved Linearizing Digital Interface for Shaft Angle Sensors with Sine–Cosine Characteristic
TL;DR: The proposed Linearizing Digital Interface implements a simple ratiometric linearization scheme, with the help of an enhanced dual-slope-based circuit, to measure the angular position and is found to be minimally sensitive to several circuit and sensor nonidealities.
Practical Considerations and Performance Evaluation of An Offset Elimination Scheme for Half-Bridge TMR Angle Sensor
TL;DR: In this article , a simple technique is discussed to obtain offset-free sine-cosine natured outputs from the half-bridge type TMR angle sensor, which does not require costly instrumentation amplifiers and is well suited for temperature fluctuating environment.
Proceedings ArticleDOI
Practical Considerations and Performance Evaluation of An Offset Elimination Scheme for Half-Bridge TMR Angle Sensor
TL;DR: In this paper , a simple technique is discussed to obtain offset-free sine-cosine natured outputs from the half-bridge type TMR angle sensor, which does not require costly instrumentation amplifiers and is well suited for temperature fluctuating environment.
References
More filters
Book
Design with Operational Amplifiers and Analog Integrated Circuits
TL;DR: In this article, the authors present a design-oriented course for operational amplifiers and analog ICs, which includes additional problems, more in-depth coverage of negative feedback, more effective layout, updated technology (current feedback and folded-cascode amplifiers, and low-voltage amplifiers), and increased topical coverage (current-feedback amplifier, switching regulators and phase-locked loops).
Journal ArticleDOI
Software-Based Resolver-to-Digital Conversion Using a DSP
TL;DR: A simple and cost-effective software-based resolver-to-digital converter using a digital signal processor that enables the determination of the angle for a complete 360deg shaft rotation with reasonable accuracy using a lookup table that contains entries of up to 45deg.
Journal ArticleDOI
Position Measurement in Industrial Drives by Means of Low-Cost Resolver-to-Digital Converter
Ciro Attaianese,Giuseppe Tomasso +1 more
TL;DR: A fully integrated board for resolver-to-digital conversion is proposed, based on a combined analog/digital circuit, which allows one to track the shaft angle of a standard resolver in a digital form.
Journal ArticleDOI
A high precision resolver-to-DC converter
TL;DR: A newly developed resolver converter, providing a pseudolinear voltage proportional to the shaft angle, is presented, based on a new concept involving the absolute values of the demodulated sine and cosine resolver signals together with a dedicated linearization technique.
A Novel Resolver-to-360 Linearized Converter
TL;DR: This paper gives the theoretical anal- ysis, the computer simulation, the full circuit details, and experi- mental results of the proposed resolver-to-dc converter.