scholarly journals Comparative analysis of two gain-and offset-compensated four-phase switched-capacitor integrators based on the second-order Adams-Bashworth’s integration method

2004 ◽  
Vol 1 (2) ◽  
pp. 227-236
Author(s):  
Nikolay Radev ◽  
Kantcho Ivanov
Keyword(s):  
Comparative Analysis ◽  
Integration Method ◽  
Building Blocks ◽  
Second Order ◽  
Switched Capacitor ◽  
Offset Voltage ◽  
Band Pass ◽  
Analytical Expressions

Gain-and offset-compensated (GOC) modifications of four-phase inverting and no inverting switched-capacitor integrators based on the second-order Adams-Bashworth?s integration method are presented. Analytical expressions for the gain, phase and offset voltage errors are derived and compared with the corresponding errors of the earlier ones compensated integrators. The two pairs of GOC integrators are used as building blocks of a band pass biquad. The performances of the resulting filters are also compared.

scholarly journals A comparative analysis of two gain- and offset-compensated switched-capacitor integrators

2002 ◽  
Vol 15 (2) ◽  
pp. 295-305
Author(s):  
Nikolay Radev ◽  
Kantcho Ivanov
Keyword(s):  
High Performance ◽  
Building Blocks ◽  
Switched Capacitor ◽  
Central Frequency ◽  
High Q ◽  
Offset Voltage ◽  
Dc Gain ◽  
Band Pass ◽  
Analytical Expressions ◽  
The Ideal

Two high-performance switched-capacitor (SC) integrators which use different approaches for the compensation of the operational amplifier finite dc gain and offset voltage are considered. Analytical expressions for the gain, phase and offset voltage errors of the Baschirotto-90 integrator are derived and compared with the corresponding errors of the Shafeeu-91 integrator. Both the integrators are used as building blocks of a high-Q band pass SC biquad. The resultant filters are compared in terms of the percent deviations from the ideal case of the central frequency and the quality factor. Subsequently, the slight shift in the frequency response of the biquad with Shafeeu-91 integrator is eliminated by modifying the values of two capacitors .

ANALYSIS OF MULTI-STAGE AND MULTI-RATE IIR SC DECIMATORS USING ISCMRATE

2014 ◽  
Vol 23 (07) ◽  
pp. 1450093
Author(s):  
NGAI CHEONG
Keyword(s):  
Comparative Analysis ◽  
Statistical Approach ◽  
Building Blocks ◽  
Switched Capacitor ◽  
Multi Stage ◽  
Sc Filter ◽  
Practical Feasibility

This paper describes an analysis of multi-stage and multi-rate IIR switched capacitor (SC) decimators using an interactive switched capacitor multi-rate compiler (ISCMRATE). Motivated by the experimental observations, the purpose of this paper is to explore a portion of characteristics for the multi-stage IIR SC decimators, with their implications in the context of a complete IIR SC filter. To overcome the limitations of conventional multi-stage IIR SC decimators, a novel solution has been introduced for the implementation of a multi-stage IIR SC circuit. Based on the statistical approach of the compiler, we provide the comparative analysis for different IIR SC decimators, including total capacitor area, capacitance spread and arbitrary anti-aliasing amplitude responses with a decimating factor in single and multi-stage building blocks. Examples are given to illustrate the practical feasibility of this compiler.

A NEW SWITCHED OPAMP APPROACH FOR IMPROVING THE OPERATION OF AUTO-RESET SWITCHED-CAPACITOR FILTERS

2011 ◽  
Vol 20 (05) ◽  
pp. 835-848 ◽  
Author(s):  
MOHAMMAD RASHTIAN ◽  
OMID HASHEMIPOUR ◽  
KEIVAN NAVI ◽  
ALI JALALI
Keyword(s):  
Power Consumption ◽  
Quality Factor ◽  
Second Order ◽  
Considerable Reduction ◽  
Center Frequency ◽  
Switched Capacitor ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Pass ◽  
Switched Capacitor Filters

In this paper, a new switched opamp is presented in order to improve the operation of auto-zeroed switched capacitor circuit. This approach results in a considerable reduction in power consumption and a moderate speed improvement. Based on the above improvement, a second-order band-pass filter with a center frequency of 833 kHz and quality factor of 8 is realized and compared with previous works. The proposed switched opamp is also utilized in the structure of a novel z to -z2 block for the design of pseudo two-path band-pass filters. A second-order pseudo two-path band-pass filter with the same specification of the previous work is designed, simulated, and compared.

scholarly journals Impact of difference between explicit and implicit second-order time integration schemes on isotropic/anisotropic steady incompressible turbulence field

2021 ◽  
Vol 2090 (1) ◽  
pp. 012145
Author(s):  
Ryuma Honda ◽  
Hiroki Suzuki ◽  
Shinsuke Mochizuki
Keyword(s):  
Kinetic Energy ◽  
Energy Conservation ◽  
Integration Method ◽  
Time Integration ◽  
Second Order ◽  
Implicit Time ◽  
Explicit Time Integration ◽  
Time Integration Method ◽  
Implicit Time Integration ◽  
Time Integration Methods

Abstract This study presents the impact of the difference between the implicit and explicit time integration methods on a steady turbulent flow field. In contrast to the explicit time integration method, the implicit time integration method may produce significant kinetic energy conservation error because the widely used spatial difference method for discretizing the governing equations is explicit with respect to time. In this study, the second-order Crank-Nicolson method is used as the implicit time integration method, and the fourth-order Runge-Kutta, second-order Runge-Kutta and second-order Adams-Bashforth methods are used as explicit time integration methods. In the present study, both isotropic and anisotropic steady turbulent fields are analyzed with two values of the Reynolds number. The turbulent kinetic energy in the steady turbulent field is hardly affected by the kinetic energy conservation error. The rms values of static pressure fluctuation are significantly sensitive to the kinetic energy conservation error. These results are examined by varying the time increment value. These results are also discussed by visualizing the large scale turbulent vortex structure.

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