Parasitic compensated switched capacitor circuits

Fleischer, P.E.; Ganesan, A.; Laker, K.R.

doi:10.1049/el:19810648

Cited by 41 publications

(7 citation statements)

References 1 publication

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“…8, which contain parasitic-sensitive capacitances C Kx (x is 3, 10, or 14). The parasitic capacitances can be compensated for by replacing those circuits by the SC [8], but then the total capacitance of the KT2APF increases by 3C K3 C K10 C K14 3C 2 6C 3 .…”

Section: Results Of Experimental Setup For S1apfmentioning

confidence: 99%

Parasitic-insensitive switched-capacitor variable all-pass filters that have small total capacitance

Sekiguchi

Takahashi

Takebe

1999

Electron. Comm. Jpn. Pt. III

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This paper proposes a method of constructing first‐ and second‐order switched‐capacitor variable all‐pass circuits that have small total capacitance and are parasitic‐insensitive. A first‐order circuit, in which the peak group delay at zero angular frequency can be specified by using a programmable capacitor array, and a second‐order circuit that has a first‐order subcircuit, in which the peak bandpass group delay and the corresponding angular frequency (peak angular frequency) can be specified independently, have already been presented. Those constructions, however, have the problem that the capacitance spread is generally enlarged in the first‐order circuit (defined here as the maximum capacitance when the minimum capacitance is normalized to 1). This increases the total capacitance in both the first‐ and second‐order circuits and makes the second‐order circuit parasitic‐sensitive. This paper, on the other hand, proposed circuits that are parasitic‐insensitive and have smaller total capacitances than the circuits proposed in the past. The second‐order circuit proposed in the past also has the problem that the peak angular frequency cannot be set higher than half the Nyquist angular frequency, but this is possible in the proposed second‐order circuit. Another point is that the number of operational amplifiers is reduced by one in the proposed circuit. The calculated amplitude element‐sensitivities of the first‐ and second‐order circuits are smaller than the past values. The proposed circuit was experimentally constructed using discrete components, and a satisfactory result was obtained. © 1999 Scripta Technica, Electron Comm Jpn Pt 3, 82(10): 50–62, 1999

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Section: Results Of Experimental Setup For S1apfmentioning

confidence: 99%

Parasitic-insensitive switched-capacitor variable all-pass filters that have small total capacitance

Sekiguchi

Takahashi

Takebe

1999

Electron. Comm. Jpn. Pt. III

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“…This arrangement of switches has another benefit that the circuit is insensitive to parasitic capacitance [4].…”

Section: Fig 3 Biquad Band-passed Filtermentioning

confidence: 99%

A Switched-Capacitor Band-Pass Filter For Low-Voltage Applications

Chen

2006

2006 8th International Conference on Solid-State and Integrated Circuit Technology Proceedings

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A switched-capacitor (SC) biquad band-pass filter for very low-voltage applications is designed and fabricated in 1 m CMOS process, which can operate at 1V supply voltage, consuming 287 W at room temperature. In the SC filter circuit proposed, a novel rail-to-rail operational amplifier is used to obtain the maximum dynamic range. The band-pass filter has BW -3dB =101Hz at its central frequency of 376Hz.

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“…Fig. 1(b) shows a parasiticcompensating CBSC inverting integrator [7]. This inverting integrator is compatible with the CBSC technique because sampling and charge redistribution occur in separate clock phases.…”

Section: Introductionmentioning

confidence: 95%

Analysis of Errors in a Comparator-Based Switched-Capacitor Biquad Filter

White

Luschas

Krishnan

2009

IEEE Trans. Circuits Syst. II

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Comparator-based switched-capacitor (CBSC) techniques have become popular in reducing power consumption and increasing the speed of data converters. This brief investigates the use of CBSC techniques for implementing a biquad filter. A CBSC implementation of a low-pass biquad is proposed, and the sources of error are analyzed. It is shown that implementing the lossy integrator as the last stage produces a lower offset voltage. The sensitivity of the biquad ω 0 and Q to the CBSC overshoot error is shown to be similar to that of the finite operational amplifier gain error in a switched-capacitor filter. Simulation results confirm the presented theory.Index Terms-Biquad, comparator-based switched capacitor (CBSC), switched-capacitor (SC) filter.

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Parasitic compensated switched capacitor circuits

Cited by 41 publications

References 1 publication

Parasitic-insensitive switched-capacitor variable all-pass filters that have small total capacitance

Parasitic-insensitive switched-capacitor variable all-pass filters that have small total capacitance

A Switched-Capacitor Band-Pass Filter For Low-Voltage Applications

Analysis of Errors in a Comparator-Based Switched-Capacitor Biquad Filter

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