Thermal noise analysis of switched‐capacitor integrators with correlated double sampling

Im, Saemin; Park, Sang Gyu

doi:10.1002/cta.2214

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…Figure 5 shows the fourth-order SC band-pass filter. The calculation of voltage noise spectral density [12] of the equivalent circuit was based on [13]. The total voltage noise spectral density and its components are shown in Figure 12.…”

Section: Noise In Sc Filtermentioning

confidence: 99%

Noise and sensitivity comparison for different BP filter designs

et al. 2021

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In this paper, the analysis of noise and sensitivity for different BP filter designs is observed. Calculation of the voltage noise spectral density, root mean square (RMS) value of the noise voltage, Schoeffler sensitivity and the multi-parameter sensitivity is done for the simply designed (SD) active RC, noise and sensitivity optimized (NO and SO) active RC, operational transconductance amplifiers (OTA-C) and switched capacitor (SC) filter designs. This is observed for the fourth-order Chebyshev band-pass filter, with central frequency f c = 4 kHz, bandwidth 1 kHz and pass-band ripple α max = −0.1 dB. Cascade of two second-order sections is used for fulfilment realization of all four observing designs. Programming tools, such as MATLAB and SPICE (LTspice), are also used for the analyses. Highlights• We used three different designs and optimization (noise and sensitivity) procedure for design and optimize the fourth-order Chebyshev band-pass filter • Our results suggest which design is best to use for improving noise and sensitivity of this filter • MATLAB and SPICE software were used for calculations and simulations of different band-pass filter designs and analysis of noise and sensitivity ARTICLE HISTORY

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Section: Noise In Sc Filtermentioning

confidence: 99%

Noise and sensitivity comparison for different BP filter designs

et al. 2021

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“…Noise cancellation capacitor, C CDS , must be sized well larger than the input capacitance of the op-amp for limiting the degradation of the noise performance. 22,23 However, an excessively large value for C CDS affects the harmonic distortion of the modulator. A typical choice is C CDS ≈ C s .…”

Section: Low-frequency Noise Cancelationmentioning

confidence: 99%

Design‐oriented model for power‐driven design optimization of SC‐ΣΔ modulators

Boni

Giuffredi

Pietrini

et al. 2017

Circuit Theory & Apps

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A behavioral model for switched-capacitors sigma-delta modulators, suitable for power-driven design, is presented. Because of the oversampling behavior of this kind of analog-to-digital converters, transistor-level simulations are extremely time consuming. Thus, accurate behavioral models are mandatory in the preliminary design steps to cut the development time. However, when the power consumption of the modulator is pushed down to the absolute minimum level, second-order effects affecting the settling behavior of the switched-capacitor integrator must be taken into account. Furthermore, by means of an accurate noise model, based on a second-order transfer function of the amplifier, a global power minimization is achieved, and the optimum partitioning between the switch and op-amp noise is obtained. In spite of the improved accuracy, the proposed model requires only a few parameters of the amplifier in the integrator. This allows to easily link the model to an external set of circuit equations, to be derived for the specific amplifier used in the modulator. The model was used in the design of a third-order modulator in an STM 90-nm technology. The silicon samples exhibit an effective resolution of 15.2-b with a 500-Hz output rate, an oversampling ratio of 500, and a Schreier figure-of-merit of 162 dB, with a 38-W power consumption at 1.2-V supply.

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“…Continuous-time band-pass (BP) filters still have an important place in modern-day systems as is evident in numerous recent publications, eg, Wu and Chiu, 1 Monsurrò et al, 2 and Fabre et al 3 Because noise is a limiting factor in the performance of such filters, its analysis continues to be of interest, for example, for current-mode (CM) filters, 4 CMOS operational transconductance amplifiers, 5 low-noise amplifiers, 6 and thermal noise in switched-capacitor (SC) circuits. 7,8 In this paper, the output noise of coupled biquads, realizing fourth-order BP filters, is analysed using the noise model described in Jurisic et al 9 Noise analysis of CM filters using the AD844 current-feedback operational amplifier (CFOA) is also provided.…”

Section: Introductionmentioning

confidence: 99%

Low‐noise and low‐sensitivity filters using current‐mode coupled biquads

Jurisic

Moschytz

2019

Circuit Theory & Apps

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Summary In this paper, it is shown that by adding coupling to biquad pairs to obtain a fourth‐order band‐pass filter, the output thermal noise is reduced. It is shown analytically that minimum output thermal noise is obtained when the biquads are identical and the negative‐feedback factor used for coupling is the same as for the minimum sensitivity to component tolerances and ambient changes. Furthermore, by optimizing the coupled biquads for maximum dynamic range, the output noise is further decreased.

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Thermal noise analysis of switched‐capacitor integrators with correlated double sampling

Cited by 6 publications

References 9 publications

Noise and sensitivity comparison for different BP filter designs

Noise and sensitivity comparison for different BP filter designs

Design‐oriented model for power‐driven design optimization of SC‐ΣΔ modulators

Low‐noise and low‐sensitivity filters using current‐mode coupled biquads

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