A 0.13μm CMOS Front-End for DCS1800/UMTS/802.11b-g with Multi-band Positive Feedback Low Noise Amplifier

Liscidini, Antonio; Brandolini, M.; Sanzogni, D.; Castello, R.

doi:10.1109/vlsic.2005.1469415

Cited by 34 publications

(37 citation statements)

References 6 publications

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“…The single-ended-to-differential conversion previously handled by an inter-stage SAW filter is now performed by a balun. The balun is followed by high-IIP2 MP mixers [2] driven by Cherry-Hooper LO buffers. The MP BB filter is an active-RC 3 rd -order Chebyshev architecture that drives an 8b pipelined ADC with f s =50MHz.…”

mentioning

confidence: 99%

Equalization of IM3 Products in Wideband Direct-Conversion Receivers

Keehr

Hajimiri

2008

2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers

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As scaling reduces the breakdown voltage of CMOS devices and as system integration trends demand the further elimination of offchip components, there arises a great need to improve the linearity of RF receivers. Of particular interest is the direct-conversion architecture, which is currently the workhorse of the mobile telecommunications industry. Although much work has been recently reported in improving the IIP2 of these receivers, the IIP3 requirements still necessitate the use of an inter-stage SAW filter in many applications.In order to remove the SAW filter and to reduce the linearity requirements of the receiver circuitry, in this paper, an alternate path (AP) in parallel with the main path (MP) is introduced (Fig. 10.3.1). The AP generates IM3 products in the analog domain and downconverts them to baseband (BB) using the same LO signal as the MP. The IM3 products are then digitized and used as inputs to an equalizer that cancels the baseband IM3 products in the MP. This idea has recently been posited in a system-level study [1]; however, the challenges of implementing this system with an integrated RF front-end have not yet been addressed. This solution has the advantages of being both power-efficient and robust. Since the AP must only pass IM3 products, the dynamic ranges of its constituent blocks can be over 10dB less than those of the MP, allowing for significant power savings in its overall design. As problematic blocker conditions occur less than 10% of the time, the time-averaged power dissipation of the AP is further reduced from its nominal value by powering it on only when needed. The adaptive nature of the equalization guarantees robustness in the presence of changes in temperature, LO frequency, and blocker characteristics.The receiver architecture proposed in this paper is shown in Fig. 10.3.2. In order to provide a quantitative design objective, the UMTS standard is targeted. The single-ended-to-differential conversion previously handled by an inter-stage SAW filter is now performed by a balun. The balun is followed by high-IIP2 MP mixers [2] driven by Cherry-Hooper LO buffers. The MP BB filter is an active-RC 3 rd -order Chebyshev architecture that drives an 8b pipelined ADC with f s =50MHz. The AP is a scaled-down version of the MP, with the primary difference being the inclusion of an IM3 generator. For area efficiency, the AP mixer dispenses with the IM2 tuning inductor used in the MP while resistively loaded differential pairs serve as LO buffers. The AP 1 st -order BB filter drives an 8b pipelined ADC with f s =16.66MHz.In a proper design, the IM3 generator requires a dynamic range of 10dB above the desired IM3 cancellation ratio. Unlike other approaches [3] that use the 3 rd -order Taylor series term of the MOSFET, this design, shown in Fig. 10.3.3, exploits the stronger 2 nd -order term by using a conventional squaring circuit and by finishing the cubing with a Gilbert multiplier. Two Gilbert multipliers in series also accomplish a cubing, but generate a higher IM5 product since th...

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confidence: 99%

Equalization of IM3 Products in Wideband Direct-Conversion Receivers

Keehr

Hajimiri

2008

2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers

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“…Furthermore, this technique does not require prior knowledge of one or more of the blocker frequencies, as do techniques that rely on the cancellation of TX leakage to meet the UMTS linearity specifications [15,16]. Although both IM2 and IM3 products can be concurrently canceled by parallel LMS adaptive filters, it was decided in this project to leverage recent work [17,18] in order to perform local IIP2 improvements so as to avoid adding additional analog-to-digital converters (ADCs) to the system to pass reference IM2 products.…”

Section: Architectural Conceptsmentioning

confidence: 99%

Digitally Enhanced Alternate Path Linearization of RF Receivers

Hueber

Staszewski

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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“…Furthermore, this technique does not require prior knowledge of one or more of the blocker frequencies, as do techniques that rely on the cancellation of TX leakage to meet the UMTS linearity specifications [12], [13]. Although both IM2 and IM3 products can be concurrently cancelled by parallel LMS adaptive filters, it was decided in this project to leverage recent work [14], [15] to perform local IIP2 improvements in order to avoid adding additional ADCs to the system to pass reference IM2 products.…”

Section: B Study Motivation and Application To Nonlinear Rf Receiversmentioning

confidence: 99%

“…As the system proposed in this paper only equalizes IM3 products, the mixer utilizes a folded high-IIP2 mixer in order to obviate any IM2 equalization [15]. The schematic of this mixer as implemented is shown in Fig.…”

Section: B Mixer and Lo Buffermentioning

confidence: 99%

Equalization of Third-Order Intermodulation Products in Wideband Direct Conversion Receivers

Keehr

Hajimiri

2008

IEEE J. Solid-State Circuits

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Abstract-This paper reports a SAW-less direct-conversion receiver which utilizes a mixed-signal feedforward path to regenerate and adaptively cancel IM3 products, thus accomplishing system-level linearization. The receiver system performance is dominated by a custom integrated RF front end implemented in 130-nm CMOS and achieves an uncorrected out-of-band IIP3 of 7.1 dBm under the worst-case UMTS FDD Region 1 blocking specifications. Under IM3 equalization, the receiver achieves an effective IIP3 of +5.3 dBm and meets the UMTS BER sensitivity requirement with 3.7 dB of margin.

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A 0.13μm CMOS Front-End for DCS1800/UMTS/802.11b-g with Multi-band Positive Feedback Low Noise Amplifier

Cited by 34 publications

References 6 publications

Equalization of IM3 Products in Wideband Direct-Conversion Receivers

Equalization of IM3 Products in Wideband Direct-Conversion Receivers

Digitally Enhanced Alternate Path Linearization of RF Receivers

Equalization of Third-Order Intermodulation Products in Wideband Direct Conversion Receivers

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