Design of an OTA-based microwave active bandpass filter

Jarjar, Mariem; Ouazzani, Nabih El

doi:10.1109/wits.2017.7934688

Cited by 4 publications

(3 citation statements)

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“…being 𝐶 the equivalent series capacitance of 𝐶 and 𝐶 , given by: 𝐶 = 𝐶 𝐶 𝐶 + 𝐶 (8) From Equation ( 5) we can see that the series resistance 𝑅 to the feedback has two main consequences: the frequency range in which the real part is negative is reduced, and its maximum value is reduced too. The resistance is also fundamental for stability as a damping element because of the feedback structure of the active cell that can cause instability due to its positive gain; a good value of resistance can dissipate enough power to avoid oscillation and positive feedback.…”

Section: Losses Compensation and Frequency Tuningmentioning

confidence: 99%

“…In the literature, the main proposed solutions are based on active inductors or, as in this paper, active capacitors. The first kind involves a feedback network (typically a gyra-tor) with a transistor that emulates an inductance, removing issues typically caused by physical inductors [6][7][8][9]. Since the real inductor is removed, those filters tend to have a higher Q compared with the other topologies [10] and are suitable choices for integrated systems [11].…”

Section: Introductionmentioning

confidence: 99%

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A Second Order 1.8–1.9 GHz Tunable Active Band-Pass Filter with Improved Noise Performances

et al. 2022

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In this paper, a novel active tunable band-pass filter with improved noise performances is presented. This filter is based on a negative resistance circuit (or active capacitance), where the gain obtained with a transistor is used to compensate for inductor losses. Moreover, the capacitance of the resonator is obtained through a voltage-controlled reverse-biased varactor, which allows for frequency tuning. Despite the active component, the proposed filter also has good noise performance. Measurements show a tunability range from 1.816 GHz to 1.886 GHz, with a bandwidth of 38 MHz. The insertion loss maximum value is 0.4 dB, while the noise figure value has a minimum value of 2.5 dB at the center frequency within the tunability range.

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Section: Losses Compensation and Frequency Tuningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Second Order 1.8–1.9 GHz Tunable Active Band-Pass Filter with Improved Noise Performances

et al. 2022

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“…Figure 3 present the real structure of the proposed active inductor. Assuming that all the MOS transistors are similar, the input admittance of the active inductor is given by (1) on the basis of the small signal analysis [16]:…”

Section: Chebyshev Active Bandpass Filter 31 Single Ended Active Indu...mentioning

confidence: 99%

Design of a CMOS-based microwave active channelized bandpass filter

Jarjar¹,

Nabih²

2019

TELKOMNIKA

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A two-branch microwave active bandpass filter is designed through the channelized filtering technique as well as the transversal concept. Both the main and the auxiliary branches, connected without power dividers/combiners, rely on C-coupled active third order Chebyshev bandpass filters. A lumped element signal delay circuit is also introduced in the main channel. Active inductors based on the gyrator-C topology, are involved in the Chebyshev filters' structure. CMOS-based Operational Transconductor Amplifier (OTA) circuits are the building blocks of these inductors. The proposed active transversal channelized filter produces an elliptic narrow band response, centered at 1.13 GHz. Simulation results, obtained by means of the PSPICE code according to the 0.18 µm TSMC MOS technology, indicate excellent performances illustrating good impedance matching, low insertion losses and high selectivity. Finally, the noise analysis shows that the filter has a low noise figure in the bandwidth.

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