APPLICATION OF THE PLL CONTROL AT THE REALIZATION OF A 16-THROUGH ADC

2018 ◽  
pp. 6-12 ◽  
Author(s):  
R. V. Magerramov
Keyword(s):  
Electronic Device ◽  
Phase Locked Loop ◽  
Low Noise ◽  
Phase Detector ◽  
Modern World ◽  
Voltage Controlled Oscillator ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Analog To Digital ◽  
Low Pass

This article describes the method of converting an analog signal into a digital code using a phase locked loop (PLL) circuit. The functional structure of the voltage-to-digital conversion circuit is considered. The application of the principle of phase-locked loop for controlling the duty cycle of the output signal of a phase detector when the voltage at the positive input of the operational amplifier included in the low-pass filter is investigated. In the modern world, analog-to-digital converters (ADCs) are available in almost every electronic device. The application of different ADC architectures is determined by their parameters and features by circuit and technological implementation. The phase-locked loop with a digital part (16-bit counter, storage register and data transfer interface) allows to obtain a precision analog-to-digital converter, based on a relatively simple circuit design, which has high accuracy and low noise level. Negative feedback of the PLL loop makes it possible to level the error of the passive elements of the low-pass filter (LPF) and the voltage controlled oscillator (VCO). The result of this work is an analysis of the ADC characteristics in the technological basis of 250 nm.

LC-Resonant and High-Temperature Resistant Acceleration Sensor Based on DSP

2011 ◽  
Vol 105-107 ◽  
pp. 1966-1969
Author(s):  
Tao Guo ◽  
Jie Zhu ◽  
Gui Tang ◽  
Yan Xu
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Space Shuttle ◽  
Digital Signal ◽  
Acceleration Sensor ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Analog To Digital ◽  
Acceleration Sensors ◽  
Low Pass

It is a challenging problem to test the acceleration of the high-speed missiles and space shuttle under high temperature. This paper proposed a design of LC-resonant and high-temperature resistant acceleration sensors about the phenomenon. With the operational amplifier OP4177, it produces the input signal that contents with A/D (Analog to Digital) signal. An eight level low-pass filter MAX291 is used for testing after the signal is regulated. This design mainly uses AD7934 to complete the conversion from analog signals to digital signals. It also recognizes the resonant point of LC acceleration sensor by the DSP （Digital Signal Processing）recognizing program. The acceleration is computed finally by the DSP chip.

A New Small-Sized Non-Dispersive Infrared (NDIR) Sensor and its Drive/Readout Circuits

2016 ◽  
Author(s):  
Paul C.-P. Chao ◽  
Li-Chi Hsu ◽  
Trong-Hieu Tran
Keyword(s):  
Pulse Width Modulation ◽  
Cmos Process ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Analog To Digital ◽  
Readout Circuits ◽  
Low Pass ◽  
Driver Circuit ◽  
Module Size ◽  
Gas Chamber

A new miniaturized, non-dispersive, infrared (NDIR) sensor for CO2 intended to be installed in mobile phones and its drive/readout circuits are presented in this study. A typical NDIR sensor consists of three main components; an infrared (IR) light-emitter (light source), a gas chamber, a photo detector (PD) light receiver) and the associated drive/readout circuits. The geometry of the gas chamber is optimized to minimize the total module size to approximately 10 mm × 5 mm × 5 mm, which is much smaller than commercially-available gas sensors. Driver and readout circuits are successfully designed and taped out. The driver circuit intends to generate pulse width modulation (PWM) signal to control proper dimming of LED. The readout circuit, which acquires small signal from photo detector then converts to digital values, includes amplifier, low pass filter and analog-to-digital converter (ADC). The proposed circuit is fabricated by the TSMC 0.35-μm CMOS process, where the area is 4.527 mm2 while power consumption is 60.16 mW for the whole chip. The resolution is less than 12 ppm along with time constant is 0.1 sec.

Data Acquisition System Connect to CMG-3T Low-Frequency Seismic Pendulum

2013 ◽  
Vol 734-737 ◽  
pp. 2945-2948
Author(s):  
Ting Ting Liu ◽  
Yong Wu ◽  
Jun Lin
Keyword(s):  
Data Acquisition ◽  
Seismic Waves ◽  
Low Frequency ◽  
Data Acquisition System ◽  
Low Noise ◽  
Acquisition System ◽  
Power Module ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Aiming at the low-frequency performance of the lowfrequency seismic pendulum CMG -3T, we design a data acquisition system can acquire the low-frequency seismic waves, at the same time we accomplish the process of adjusting the CMG-3T. This paper gives designing scheme include the low noise design of the power module, the design of the connector to RS232 which can send command to adjusting the mass of CMG-3T,the design of voltage attenuation network and no-source low-pass filter network of data acquisition system, the last is the design of software for adjusting the CMG-3T.

A Technique for Embedding SPICE in a Simulink Environment for MEMS Simulations

2010 ◽  
Author(s):  
Christopher G. Wilson ◽  
Robert Dean ◽  
George T. Flowers ◽  
John Y. Hung
Keyword(s):  
Microelectromechanical Systems ◽  
Electronic Device ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Function Block ◽  
Simulink Model ◽  
Straightforward Method ◽  
Low Pass ◽  
Filter Type ◽  
Control Electronics

Computer simulations are powerful tools in the designer’s toolbox, giving an estimate of what the device will actually do once realized. Two such tools, Simulink and SPICE are commonly used to design, simulate, and verify models in the mechanical and electronic domains, respectively. Challenges can arise, however, when attempting to simulate behaviors of hybrid systems that possies both electronic and mechancial subsystems. For example, in microelectromechanical systems (MEMS) designs, variable capacitors are frequent methods for sensing and actuating. While straightforward to model in Simulink, MEMS are not intuitive to model in SPICE, where the control electronics are simulated. On the other hand, SIMULINK is a less mature tool than SPICE for simulating electronic behaviors — SPICE already posseses large libraries of electronic device models. Thus, current MEMS designers lack a straightforward method to simulate and verify variable capacitors in a transient electronic circuit in SPICE, since the entire mechanical system must be converted from Simulink and verified. This paper presents a technique for embedding NGSPICE, an open-source SPICE implementation, inside a Simulink model via a S-function block, enabling a full system model for transient responses to be realized. A Level 2 M-file S-function block implements the calling and parsing of the associated electronic subsystem circuit file. The required modifications for the circuit file to the Simulink model are described. Validation testing using a low-pass filter type circuits with constant and variable capacitance are presented. Some examples are presented and discussed.

scholarly journals Demodulation of Angular Position and Velocity from Resolver Signals via Chebyshev Filter-Based Type III Phase Locked Loop

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 354 ◽  
Author(s):  
Huan Liu ◽  
Zhong Wu
Keyword(s):  
Angular Position ◽  
Frequency Measurement ◽  
Phase Locked Loop ◽  
Estimation Accuracy ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Type Iii ◽  
Low Pass ◽  
Chebyshev Filter ◽  
Demodulation Method

A high-accuracy demodulation algorithm is required to estimate angular position and angular velocity from resolver signals. In order to improve the estimation accuracy of conventional phase-locked loop (PLL) based demodulation method, a Chebyshev filter-based type III PLL method is proposed in this paper. The proposed method makes PLL become a system of type III tracking loop, which could greatly reduce the theoretical constant deviation in the estimation results of conventional type II PLL in case of variable speed. Meanwhile, the eigenvalues of type III PLL are placed to be the same position as those of a Chebyshev low-pass filter. In this way, demodulation parameters with stronger filter properties can be obtained to effectively suppress the high-frequency measurement noise in resolver signals. Thus, the proposed method can achieve higher demodulation precision compared with the conventional ones. Simulations and experiments are performed to validate the proposed demodulation method.

A 0.18-μm CMOS low-noise highly linear continuous-time seventh-order elliptic low-pass filter

2005 ◽  
Author(s):  
Juan F. Fernandez-Bootello ◽  
Manuel Delgado-Restituto ◽  
Angel Rodriguez-Vazquez
Keyword(s):  
Continuous Time ◽  
Low Noise ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Seventh Order
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