Reconfigurable multiband SAW filters for LTE applications

Galipeau, J.; Mouthaan, Koen; Briot, E.; Abbott, B. P.

doi:10.1109/pawr.2013.6490196

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…In addition, the receivers need to deal with large out-of-band (OOB) blockers (a strong interferer), while frequency-division duplex also introduces strong self-interference from the transmitter. To prevent degradation in sensitivity, a off-chip high-linearity surface acoustic-wave (SAW) filters are often adopted [2]. However, these filters increase size and cost, and introduce 2-3 dB of in-band loss.…”

Section: Introductionmentioning

confidence: 99%

A 1.8 to 4 GHZ Receiver Front-End With 250 MHZ Baseband Bandwidth for Advanced Cellular Applications

Luận¹,

Thọ²

2022

TNUJST

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Bài báo này trình bày về mạch cao tần không sử dụng cuộn cảm với băng thông băng gốc rộng trong máy thu băng rộng. Máy thu chuyển đổi trực tiếp dựa trên cấu trúc này thích hợp cho máy thu 5G hoặc các hệ thống không dây khác. Mạch cao tần trong máy thu băng rộng bao gồm mạch khuếch đại tạp âm thấp (LNA), mạch trộn tần thụ động và mạch khuếch đại biến đổi dòng-áp dải rộng (TIA). LNA sử dụng cấu trúc mạch khuếch đại nguồn chung tái sử dụng dòng kết hợp với mạch phản hồi tích cực dòng thấp để đạt được đồng thời cả tạp âm thấp và độ tuyến tính cao. Mạch TIA tự phân áp tái sử dụng dòng được đề xuất để đạt được băng thông rộng và độ tuyến tính cao. Mạch cao tần trong máy thu đề xuất được thiết kế trên công nghệ CMOS 28 nm. Mạch có băng thông RF là 2,2 GHz và băng thông băng gốc (BBBW) là 250 MHz. Hệ số tạp âm (NF) là 5,5 dB và độ lợi chuyển đổi điện áp lớn hơn 15,9 dB với khoảng thay đổi độ lợi nhỏ hơn 0,7 dB trong BBBW 250 MHz. Điểm chặn đầu vào bậc ba (IIP3) là 3 dBm tại tần số 2,3 GHz. Mạch tiêu thụ 75,2 mW với nguồn cung cấp 0,9 V và có diện tích chiếm là 0,053 mm2.

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Section: Introductionmentioning

confidence: 99%

A 1.8 to 4 GHZ Receiver Front-End With 250 MHZ Baseband Bandwidth for Advanced Cellular Applications

Luận¹,

Thọ²

2022

TNUJST

View full text Add to dashboard Cite

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Variable cutoff frequency FIR filters: a survey

et al. 2020

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Many signal processing applications require digital filters with variable frequency characteristics, especially the filters with variable bandwidth. Due to their linear phase and inherent stability, variable bandwidth finite impulse response (FIR) filters are the popular choice in majority of the applications. Once a variable cutoff frequency (VCF) FIR lowpass filter is designed, variable bandwidth bandpass / highpass / bandstop filters and reconfigurable filter banks can be realized from the same. In this paper, we present a comprehensive review of the existing variable cutoff frequency FIR filter design techniques, including the developments in the recent two decades. We provide the basic concepts, design and architectural details for each of these techniques and the major developments / incremental works thereof. Qualitative as well as quantitative comparisons are provided to assist the reader in choosing the most suitable VCF filter design technique for a particular application. Keywords FIR filters, reconfigurable filters, variable digital filters IntroductionCompared to analog filters, digital filters have advantage of higher accuracy, exact linear-phase (if desired), time-invariant performance (analog filter performance changes due to component drift), relatively smaller silicon area etc. These advantages, coupled with the advent of VLSI technology, have resulted in ubiquitous presence of digital filters in almost all the signal processing applications with a few exceptions (such as wideband filtering in radio frequency range, which is not feasible due to the bottleneck at the speed of analog-to-digital converters).Digital filters with variable frequency response characteristics are required for numerous critical applications in the fields of digital communications, audio signal processing, biomedical signal processing etc. [1,2]. In digital communications domain alone, digital filters with variable frequency response characteristics can be used for spectrum analysis, spectrum shaping, channelization, and receiver synchronization. For e.g., a digital filter having tuneable passband and transition bandwidths is used for channel extraction in a multi-standard wireless communication receiver, as it needs to be interoperable with multiple communication standards having distinct bandwidth specifications. Alternatively, a digital modem uses a digital filter to implement variable fractional delays. In general, a digital filter whose frequency response can be changed on-the-fly is called a variable digital filter. Even though such a definition means that all the parameters related to the frequency response should be variable, in practice, majority of the applications demand only a lowpass filter with variable cutoff frequency (fc), satisfying the desired minimum specifications of transition bandwidth (tbw), passband ripple (δp) and stopband ripple (δs). Therefore, the VCF (variable cutoff frequency) filter design task can be simplified further, by specifying the maximum limit on tbw, δp, and δs, and thus, only one...

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Reconfigurable multiband SAW filters for LTE applications

Cited by 2 publications

References 8 publications

A 1.8 to 4 GHZ Receiver Front-End With 250 MHZ Baseband Bandwidth for Advanced Cellular Applications

A 1.8 to 4 GHZ Receiver Front-End With 250 MHZ Baseband Bandwidth for Advanced Cellular Applications

Variable cutoff frequency FIR filters: a survey

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