A 1.5 V opamp design with high gain, wide bandwidth and its application in a high Q bandpass filter operating at 10.7 MHz

Hammouda, Sherif; Tawfik, Mohamed; Ragaie, H.F.

doi:10.1109/icecs.2002.1045364

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…8 The quality factor Q HQ versus ambient temperature for the uncompensated and compensated cases Table 4 Comparisons of the proposed Gm-C bandpass filter and existing Gm-C approaches Performance This design Tajalli and Atarodi [9] Chung-Yu and Chung-Yun [10] Munoz et al [11] Stevenson and Edgar [12] Steyaert and Silva-Martinnez [13] Hernandez-Garduno and Silva-Martinez [3] Silva-Martinez et al [4] Hammouda [5] Quinn et al [6] Nagari and Nicollini [7] Nagari et al [8] Design techniques Technologies…”

Section: Discussionmentioning

confidence: 97%

“…Recently, attempts at possible on-chip filters have particularly been demonstrated for 10.7-MHz IF filters based on, for example, switched capacitors (SC) [3][4][5][6][7][8], and Gm-C [9][10][11][12][13] techniques. Such techniques have, however, repeatedly suffered from low quality (Q) factors from 10 to 55, high total noise from 226 to 707 lV rms and limited dynamic ranges from 58 to 68 dB.…”

Section: Introductionmentioning

confidence: 99%

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A 10.7-MHz fully balanced, high-Q, 87-dB-dynamic-range current-tunable Gm-C bandpass filter

Sa-ngiamvibool

Srisuchinwong

2008

Analog Integr Circ Sig Process

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A 10.7-MHz fully balanced, high-Q, widedynamic-range current-tunable Gm-C bandpass filter is presented. The technique is relatively simple based on two fully balanced components, i.e. an adder and a low-Qbased bandpass filter. The Q factor is approximately equal to a typically high and constant value of a common-emitter current gain (b) and is, for the first time, independent of variables such as a center frequency. Possible solutions for good stability of the Q factor with temperature are suggested. Not only can the need for additional Q-tunable circuits be greatly reduced, the sensitivity of the Q factor can be greatly improved. Sensitivities of either the Q factor or the center frequency are constant between 1 and -1 and are no longer strongly affected by the Q factor or variables. As a simple example at 10.7 MHz, the paper demonstrates the high-Q factor of 121, the low total output noise of 5.303 lV rms , the 3rd-order intermodulation-free dynamic range (IMFDR 3 ) of 74.45 dB and the wide dynamic range of 87.45 dB at 1% IM 3 . The center frequency is current tunable over three orders of magnitude. Comparisons to other 10.7-MHz Gm-C approaches are also included.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

A 10.7-MHz fully balanced, high-Q, 87-dB-dynamic-range current-tunable Gm-C bandpass filter

Sa-ngiamvibool

Srisuchinwong

2008

Analog Integr Circ Sig Process

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“…The relevance of the 10.7-MHz bandpass filter design is emphasized in [10], which presents a High-Q bandpass filter boasting an impressive 87 dB dynamic range at the same frequency. In the domain of bandpass filter designs, various current-controlled and balanced designs have been explored, as evident in [12][13][14]. In this evaluation, let's meticulously assess their performance, advantages, and drawbacks, offering a critical analysis of their potential applications.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, [12] enhances linearity and minimizes distortion but demands a complex design and may be sensitive to temperature variations. In contrast, [13] optimizes bandwidth and stability but may be more susceptible to component variations. Meanwhile, [13] offers improved selectivity and tuning range but may entail greater complexity and cost.…”

Section: Introductionmentioning

confidence: 99%

The development of a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique

Lertkonsarn,

Khwunnak,

Angkawisittpan

et al. 2023

Eureka: PE

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Bandpass filters are integral in modern communication systems for selecting specific frequency ranges to ensure interference-free signal transmission and reception. This paper explores various bandpass filter designs, including those using active inductors, transmission-line unit-cells, microstrip open-loop resonators, and dual-port dual-frequency integration antennas. The focus is on the 10.7-MHz bandpass filter, widely used in FM radio and television systems. The study evaluates current-controlled and balanced designs, analyzing their performance, advantages, and drawbacks. Unique trade-offs in terms of linearity, distortion, temperature sensitivity, and component variations are discussed. Additionally, advancements in filter technology and diverse design options are presented. The paper introduces a novel current-balanced, frequency-adjusted bandpass filter to address odd-order noise issues. This filter aims to achieve high linearity, harmonic distortion attenuation, and the elimination of even-order harmonics. Through synthesis, analysis, simulation, and comparison with traditional filters, the proposed design enhances signal quality and efficiency. The fully-balanced current-tunable bandpass filter with the Caprio technique at 10.7 MHz is developed, exhibiting symmetrical characteristics with lower total harmonic distortion. The circuit’s structure is simple and adaptable for integration, validated through consistent simulation results. The study concludes by emphasizing the constant sensitivity of transistor differential amplifier circuits to the center frequency and the linear relationship between center frequency and adjustable bias current. The suggested transistor and capacitor selection criteria contribute to optimizing the circuit’s performance, aligning with the Caprio technique’s recommendations. Overall, this research presents a promising solution for achieving high-quality signal transmission in contemporary communication systems

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“…As off-chip filters are bulky and consume more power to drive external devices, the need for on-chip filters for viable fully integrated receivers has increasingly been motivated. Recently, attempts on on-chip filters have particularly been demonstrated for 10.7-MHz IF filters based on, for example, continuous-time (CT) [2][3][4][5][6] or switched capacitors (SC) [7][8][9][10][11][12] techniques. Such techniques, however, have repeatedly suffered from low quality (Q) factors (between 10 to 55), limited dynamic ranges (between 58 to 68 dB) and high total output noise (between 226 to 707 µVrms).…”

mentioning

confidence: 99%

A 10.7-MHz fully balanced, Q-of-267, 103-dB-dynamic-range current-tunable bandpass filter

Sa-ngiamvibool

Srisuchinwong

2007

2007 Asia-Pacific Conference on Communications

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A 10.7-MHz fully balanced, high-Q, wide-dynamicrange current-tunable bandpass filter is presented. The technique is relatively simple based on three fully balanced components, i.e. an adder, a low-Q-based bandpass filter and a differential amplifier. The high-Q factor is possible through a tunable bias current. As a simple example at 10.7 MHz, the paper demonstrates the high-Q factor of 267, the total low output noise of 2.089 µV rms , the 3 rd -order intermodulation-free dynamic range (IMFDR 3 ) of 82.59 dB, and the wide dynamic range of 103 dB at 1% IM 3 . The centre frequency is current tunable over 3 orders of magnitude. Comparisons to other 10.7-MHz approaches are also included.

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A 1.5 V opamp design with high gain, wide bandwidth and its application in a high Q bandpass filter operating at 10.7 MHz

Cited by 4 publications

References 8 publications

A 10.7-MHz fully balanced, high-Q, 87-dB-dynamic-range current-tunable Gm-C bandpass filter

A 10.7-MHz fully balanced, high-Q, 87-dB-dynamic-range current-tunable Gm-C bandpass filter

The development of a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique

A 10.7-MHz fully balanced, Q-of-267, 103-dB-dynamic-range current-tunable bandpass filter

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