An Electronically Tunable Bandpass BAW-Filter for a Zero-IF WCDMA Receiver

Razafimandimby, S.; Tilhac, C.; Cathelin, Andreia; Belot, Didier

doi:10.1109/esscir.2006.307551

Cited by 15 publications

(8 citation statements)

References 1 publication

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“…They have the capability of integration above Integrated Circuit (IC), while further steps are needed to implement them, compared with standard CMOS process. In addition to the extra cost, bulk acoustic wave filters have limited tuning range, and this tunabillity is mostly used to compensate the center frequency deviation posed by the process and temperature variations . With today's technology, implementation of high‐ Q on‐chip inductor is not possible; therefore, the on‐chip LC filters will show very low Q ‐factor.…”

Section: Introductionmentioning

confidence: 99%

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Harmonic fold back reduction at the N‐path filters

Hemati

Jannesari

2016

Circuit Theory & Apps

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Summary In this paper, a method is proposed to reduce harmonic fold back (HFB) problem of N‐path filters, without increasing the input reference clock (fCLK) frequency. The HFB at the N‐path filter is analyzed, and simple expressions are extracted to model this problem. Using the results of the analysis, an M‐of‐N‐path filter has been proposed that behaves like an M × N‐path filter in terms of HFB problem; however, the fCLK frequency of this structure is the same as an N‐path filter. To demonstrate the feasibility of the proposed idea, a 3‐of‐4‐path filter is designed, and its characteristics are compared with 4‐path and 12‐path filters by simulation. Impacts of different non‐idealities like clock‐phase error, mismatch, and parasitic capacitance are investigated. The transistor‐level implementation of this filter is performed in 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) technology. The simulation results show that the filter has the pass‐band gain of 17 dB, tuning range of 0.2–1.2 GHz, −3 dB bandwidth of 25 MHz, quality factor of 8–48, 18 dB out‐of‐band rejection, 16 dB rejection of the third harmonic of switching frequency (fs), and the noise figure of 4.35 dB (using ideal Gm cells) and 6.95 dB (for practical Gm cells). The strongest harmonic folding to the filter pass‐band occurs around 11fs with the attenuation of 23.8 dB. Each Gm cell draws about 12.4 mA from 1.8 V supply, and the out‐of‐band IIP3 and P1 dB,CP are 17 and 4 dBm, respectively. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

“…Each G m cell draws about 12.4 mA from 1.8 V supply, and the out-of-band IIP3 and P 1 dB,CP are 17 and 4 dBm, respectively. temperature variations [4][5][6]. With today's technology, implementation of high-Q on-chip inductor is not possible; therefore, the on-chip LC filters will show very low Q-factor.…”

mentioning

confidence: 99%

Harmonic fold back reduction at the N‐path filters

Hemati

Jannesari

2016

Circuit Theory & Apps

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“…It is low in complexity and convenient for applying artificial intelligence algorithms for fitting, and realistic modeling using an off-the-shelf computing system. Nevertheless, the aforementioned filters are composed of many resonators, with additional discrete passive or active components on the side [6]. The complexity increases more when considering non-linear and thermal effects for example.…”

Section: Introductionmentioning

confidence: 99%

Flexible Engineering Tool for Radiofrequency Parameter Identification of RF-MEMS BAW Filters

Mabrouk¹,

Boujemaa²,

Choubani³

2016

ETRI J

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In this paper, we present a new specific and customized interface tool with parameter identification of Modified Butterworth‐Van Dyke models for ladder bulk acoustic wave filters. The aforementioned tool is easy to use and flexible because it allows simulations and reengineering to be conducted in an application. A modular design approach is applied to simplify the extension of the proposed tool for different topologies. The proposed tool was validated using measurements from an aluminum‐nitride based ladder BAW filter dedicated to the frequency ranges of the Universal Mobile Telecommunications Service and standards and Wideband Code Division Multiple Access.

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“…SAW filters and off-chip filters generally limit tunability to a narrow range [3], [4]. Prior work on passive filtering has explored a variety of circuit and packaging solutions.…”

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confidence: 99%

A 0.2–3.6-GHz 10-dBm B1dB 29-dBm IIP3 Tunable Filter for Transmit Leakage Suppression in SAW-Less 3G/4G FDD Receivers

Luo

Gudem

Buckwalter

2015

IEEE Trans. Microwave Theory Techn.

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A tunable -path filter with more than one decade tuning range is demonstrated to address transmit (TX) leakage in a surface-acoustic-wave-less diversity path receiver for frequencydivision duplexing cellular systems. The proposed filter simultaneously creates a reject band and passband anywhere from 0.2 to 3.6 GHz to suppress TX leakage while minimizing insertion loss of the receive signal and is implemented in 45-nm CMOS silicon- on-insulator. Measurements show the 3-dB bandwidth of the passband is greater than 80 MHz with an independently tunable reject band, providing the ultimate rejection is from 33 to 41 dB while the passband insertion loss is between 2.6 dB and 4.3 dB over the tuning range. The proposed filter offers 29-dBm out-ofband (OOB) third-order input-intercept power (IIP3) and 22-dBm in-band (IB) IIP3 with a 10-dBm blocker 1-dB compression point (B1dB). To the authors' knowledge, this is the highest B1dB, IB IIP3, and OOB IIP3 for a CMOS tunable filter.Index Terms-Blocker suppression, CMOS, compression point, filter, high linearity, long-term evolution (LTE), -path, passive mixer, surface acoustic wave (SAW)-less, tunable. 0018-9480

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An Electronically Tunable Bandpass BAW-Filter for a Zero-IF WCDMA Receiver

Cited by 15 publications

References 1 publication

Harmonic fold back reduction at the N‐path filters

Harmonic fold back reduction at the N‐path filters

Flexible Engineering Tool for Radiofrequency Parameter Identification of RF-MEMS BAW Filters

A 0.2–3.6-GHz 10-dBm B1dB 29-dBm IIP3 Tunable Filter for Transmit Leakage Suppression in SAW-Less 3G/4G FDD Receivers

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