A highly linear CMOS Gm-C bandpass filter for video applications

Chang, Zhongyuan; Haspeslagh, D.; Boxho, J.; Macq, D.

doi:10.1109/cicc.1996.510518

Cited by 16 publications

(5 citation statements)

References 6 publications

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“…Although the algebra is a little more involved in this case, one can follow exactly the same steps presented in this paper to derive the total distortion of the filter (system). We think of these three stages as operators , , and in the signal space 4 such that (15) The response of the whole system is given by the composition of operators , and . Each operator , 1, 2, 3, can be expressed as the superposition of two operators and , respectively, (see Fig.…”

Section: Estimation Of Harmonic Distortionmentioning

confidence: 99%

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State-space harmonic distortion modeling in weakly nonlinear, fully balanced G/sub m/-C filters-a modular approach resulting in closed-form solutions

Zhang

Celik

Sotiriadis

2006

IEEE Trans. Circuits Syst. I

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State space harmonic distortion modeling and estimation are introduced for -filters with fully balanced, weakly nonlinear tranconductors. The proposed method provides compact closed-form answers expressed explicitly in terms of the values of the circuit elements. It can be easily implemented in MATLAB and applied to -filters of any order. The filter is viewed as a composition of three operators in signal space representing the input stage, the filter core, and the output stage. Each operator is then decomposed into the superposition of a linear operator and a nonlinear operator. The total distortion at the output is shown to be approximately the sum of the distortion introduced by the nonlinear operator of each stage. The theoretical results are found to be in good agreement with Cadence simulations for the cases of a lossy integrator and a third-order Butterworth low-pass filter.

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Section: Estimation Of Harmonic Distortionmentioning

confidence: 99%

“…Companding and dynamic scaling have been proposed to optimize the dynamic range [14]. Several other techniques have been discovered to reduce the nonlinearity in transconductors and therefore in filters [1], [15]- [18].…”

Section: Introductionmentioning

confidence: 99%

State-space harmonic distortion modeling in weakly nonlinear, fully balanced G/sub m/-C filters-a modular approach resulting in closed-form solutions

Zhang

Celik

Sotiriadis

2006

IEEE Trans. Circuits Syst. I

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“…Fully differential transconductors are preferred when low distortion is required in linear circuits such as Gm −C filters, [1], [3], [10], [4], [21]. Because of their balanced structure, they exhibit mainly odd order nonlinearity.…”

Section: Fully Differential Weakly Non-linear Transconductorsmentioning

confidence: 99%

Rapid intermodulation distortion estimation in fully balanced weakly nonlinear Gm-C filters using state-space modeling

Sotiriadis

Celik

Zhang

2006

Proceedings of the 16th ACM Great Lakes Symposium on VLSI

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State-space modeling of fully differential Gm-C filters with weak nonlinearities is used to develop a fast algorithm for intermodulation distortion estimation. It results in simple analytic formulas that apply directly to Gm-C filters of any order and any fully balanced topology. The algorithm has been verified using SpectreS (SPICE) and Simulink simulation. Theory and simulation results are found in good agreement.

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“…The other two special types of notch biquadratic filter are LPN and HPN biquadratic filters [47], [48], [49]. Active biquadratic filters can find many applications in sensor, biomedical, video, and audio crossover network applications [50], [51], [52], [53], [54], [55], [56]. For example, a two-way network divides the bass and high frequency ranges between two speakers [57], while a threeway network divides the bass, midrange and high frequency ranges between three speakers [58], thus requiring the design and implementation of electronically adjustable LP, HP, and BP filters from the same configuration.…”

Section: Introductionmentioning

confidence: 99%

Two New and Improved Electronically Adjustable Voltage-Mode Multifunction Biquadratic Filters With Independent Control of Band-Pass, High-Pass, and Low-Pass/Regular Notch Filter Gains

et al. 2023

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In this study, two new and improved electronically adjustable voltage-mode (VM) biquadratic filters using three off-the-shelf LT1228 integrated circuits (ICs), two grounded capacitors (GCs), and six resistors are proposed for independent control of the band-pass (BP), high-pass (HP), and low-pass/regular notch (LPN/RN) filter gains. Each proposed electronically adjustable VM multifunction biquadratic filter has one input and six output voltages, enabling simultaneous realization of one low-pass (LP), two BP, two HP, and one LPN/RN filtering responses from the same configuration. Each filter parameter, namely the pole angular frequency (ω o ) and quality factor (Q), can be electronically controlled and orthogonally adjusted by the corresponding LT1228 bias current I B . In special cases, the parameters of ω o and Q can be electronically controlled and independently adjusted. Each electronically adjustable VM multifunction biquadratic filter has one high input impedance and three low output impedances for independent control of BP, HP, and LPN/RN filter gains. Due to its one high input impedance and three low output impedances, each proposed filter is suitable for cascaded VM circuits without external voltage buffers. Pspice simulations are used to verify the theoretical structure analysis of each proposed LT1228-based electronically adjustable VM multifunction biquadratic filter. Furthermore, experimental tests are performed using three off-theshelf LT1228 ICs, and several passive components to verify and evaluate the performance of each proposed LT1228-based biquadratic filter.INDEX TERMS LT1228, analog circuit design, integrated circuits, voltage-mode, filters.

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A highly linear CMOS Gm-C bandpass filter for video applications

Cited by 16 publications

References 6 publications

State-space harmonic distortion modeling in weakly nonlinear, fully balanced G/sub m/-C filters-a modular approach resulting in closed-form solutions

State-space harmonic distortion modeling in weakly nonlinear, fully balanced G/sub m/-C filters-a modular approach resulting in closed-form solutions

Rapid intermodulation distortion estimation in fully balanced weakly nonlinear Gm-C filters using state-space modeling

Two New and Improved Electronically Adjustable Voltage-Mode Multifunction Biquadratic Filters With Independent Control of Band-Pass, High-Pass, and Low-Pass/Regular Notch Filter Gains

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