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检索条件"机构=Mixed-Signal CMOS Circuits"

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Noncontiguous LTE channel amplification using a multilevel outphasing transmitter 8

Noncontiguous LTE channel amplification using a multilevel o...

引用

8th German Microwave Conference, GeMiC 2014

作者： Hone, Thomas M. Aref, Ahmed F. Guan, Junqing Negra, Renato Mixed-Signal CMOS Circuits UMIC Research Centre RWTH Aachen University Aachen Germany

ISBN: (纸本)9783800735853

This paper presents a multilevel outphasing transmitter that is capable of amplifying noncontiguous LTE channels. Two 1.4 MHz LTE signals separated by 5 MHz are amplified concurrently using a multilevel outphasing transmitter that is implemented using 10 W GaN devices at 2.1 GHz. An ACPR performance better than -53 dBc is obtained for both 1.4 MHz LTE channels, while delivering 1 W average output power without requiring any form of predistortion. © VDE VERLAG GMBH · Berlin · Offenbach, Germany

关键词： Gallium nitride

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Improvement on extracting the static nonlinear behaviours of transmitters with precise delay estimation by increasing sampling frequency 8

Improvement on extracting the static nonlinear behaviours of...

引用

8th German Microwave Conference, GeMiC 2014

作者： Guan, Junqing Nghiem, Xuan Anh Negra, Renato Mixed-Signal CMOS Circuits UMIC Research Centre RWTH Aachen University Aachen Germany

ISBN: (纸本)9783800735853

This paper discusses and compares the delay compensated characterisation at different sampling frequencies for power amplifiers (PAs). The differences in the accuracy of the extracted AM/AM and AM/PM nonlinear behaviours are investigated. A memoryless DPD based upon the characterised nonlinearity is employed to linearise a highly efficient PA. Measurement results show that a large residual delay due to low time resolution can cause significant dispersions in the AM/AM and AM/PM curves, which can be misinterpreted as memory effects and also degrade the accuracy of the extracted static nonlinear behaviours. The method for improving the nonlinear prediction of a PA by increasing the sampling frequency to reduce the residual misalignment is presented and performed on a highly efficient GaN PA with maximum output power of 41 dBm with drain efficiency of 68% at 2.05 GHz. The measurement results show that the EVM can be improved by 4.9 percentage points together with 25 dB improvement on ACLR and 0.6 dB increase on output power by increasing the sampling frequency by 8 times. With the highest possible sampling frequency of 100 MHz, an EVM of 0.7%, an ACLR1 of −48 dBc and ACLR2 of −58 dBc can be achieved with an average output power of 33.2 dBm and drain efficiency of 50.4% for LTE 5 MHz signals with an PAPR of 7.7 dB. © VDE VERLAG GMBH · Berlin · Offenbach, Germany

关键词： Power amplifiers

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Load-tuned concurrent triband power amplifier using multiband biasing network architecture 8

Load-tuned concurrent triband power amplifier using multiban...

引用

8th German Microwave Conference, GeMiC 2014

作者： Nghiem, Xuan Anh Negra, Renato Mixed-Signal CMOS Circuits UMIC Research Centre RWTH Aachen University Aachen52056 Germany

ISBN: (纸本)9783800735853

In this paper, the design of a 10 W load-tuned (LT) concurrent triband power amplifier at 1.5, 2.14 and 2.65 GHz using the harmonic tunable property of the recently developed multiband biasing network (MB-BN) is presented. Together with the multiband matching network (MB-MN), which consists of a single transmission line, the multiband biasing network provides a means for load (or harmonic) tuning for concurrent multiband power amplifiers (PAs). Consequently, better PA performance in terms of gain, output power and efficiency can be achieved compared with the previously reported triband class-AB power amplifier without load tuning. © VDE VERLAG GMBH · Berlin · Offenbach, Germany

关键词： Power amplifiers

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Implementation of a quad-phase lowpass delta-sigma modulator in a 65 nm cmos technology 8

Implementation of a quad-phase lowpass delta-sigma modulator...

引用

8th German Microwave Conference, GeMiC 2014

作者： Thiel, Björn Thorsten Negra, Renato Mixed-Signal CMOS Circuits UMIC Research Centre RWTH Aachen University AachenD-52056 Germany

ISBN: (纸本)9783800735853

In this work the concept and implementation of a lowpass ∆Σ based transmitter is presented. The conventional LP∆Σ approach is enhanced by increasing the number of phase signals which are modulated from two to four signals. On one hand this decreases the quantisation noise on the other hand the speed requirements for the upconversion increase respectively. An appropriate topology for this concept is sketched and an implementation with focus on the upconversion multiplexer is shown. The feasibility of the topology is verified by measurements on an FPGA and shows a noise reduction between 3 dB and 6 dB. Following this, the concrete implementation is examined with post layout simulations. Finally the implementation is fabricated in an 65 nm cmos technology. © VDE VERLAG GMBH · Berlin · Offenbach, Germany

关键词： Transmitters

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Noncontiguous Channel Amplification with a Multilevel Outphasing Transmitter without Digital Predistortion

Noncontiguous Channel Amplification with a Multilevel Outpha...

引用

Asia-Pacific Microwave Conference Proceedings

作者： Hone, Thomas M. Aref, Ahmed F. Guan, Junqing Negra, Renato Rhein Westfal TH Aachen Mixed Signal CMOS Circuits UMIC Res Ctr Aachen Germany

ISBN: (纸本)9784902339314

In this paper a multilevel outphasing transmitter designed at 2.1 GHz capable of linearly amplifying noncontiguous LTE channels without requiring any additional digital predistortion is presented. After applying a static calibration to both RF branches, an ACPR performance better than -50 dBc is achieved for two 1.4 MHz LTE channels separated by 5 MHz. The number of levels will be shown to be crucial in achieving optimal linearity performance. The impact of the number of levels and the validity of the static calibration on the linearity performance is analysed.

关键词： Energy-efficiency Linearty ML-LINC LTE Outphasing Transmitter

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Iterative characterisation approach using realistic excitation signals for linearisation of transmitters

Iterative characterisation approach using realistic excitati...

引用

IEEE International Symposium on circuits and Systems (ISCAS)

作者： Guan, Junqing Nghiem, Xuan Anh Negra, Renato Rhein Westfal TH Aachen UMIC Res Ctr Mixed Signal CMOS Circuits Aachen Germany

ISBN: (纸本)9781479934324

This paper presents a new approach to improve the accuracy of power amplifier or transmitter characterisation. Compared to traditional characterisation, an iterative characterisation approach using realistic excitation signals is introduced. Based upon this approach, more accurate nonlinear behaviour for AM/AM and AM/PM can be measured. A memoryless piecewise digital predistortion (DPD) model using iterative characterisation is built to linearise a power amplifier (PA). The linearity improvement by using the iterative characterisation approach is verified in measurements with LTE excitation signals on a PA at 2.05 GHz. For a 10 MHz 64-QAM LTE signal with a PAPR of 8.1 dB measured ACLR1 could be reduced with two additional steps from -41.6 dBc to -47.6 dBc. At the same time measured EVM was better than 4.2% for an average drain efficiency of 51%. Only few steps are required with the proposed linearisation approach to improve the linearity of components without extra complexity to the DPD.

关键词： Transmitter Power Amplifier Nonlinearity Linearisation Technique LTE OFDM Characterisation

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Gain/Phase Compensation for Outphasing Transmitters Targeting LTE Applications

Gain/Phase Compensation for Outphasing Transmitters Targetin...

引用

IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications

作者： Hone, Thomas M. Aref, Ahmed F. Guan, Lunging Negra, Renato Rhein Westfal TH Aachen UMIC Res Ctr Mixed Signal CMOS Circuits Aachen Germany

ISBN: (纸本)9781479927784

This paper presents a new mismatch calibration technique for outphasing transmitters by means of instantaneous measurement characterisation. Results will show that by creating a model of the instantaneous measurements, the gain and phase imbalance between the outphasing paths can be fully compensated using only a single iteration. A multilevel-outphasing transmitter is implemented using 10 W GaN devices at 1.9 GHz. An ACPR performance of -51 dBc and -47 dBc are obtained for 1.4 MHz and 10 MHz LTE signals with a PAPR of 10 dB, respectively, while delivering 2 W average output power without requiring any form of predistortion.

关键词： Calibration ML-LINC LTE Outphasing

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Novel Design of a 10 dB Back-Off Broadband Sequential Doherty Power Amplifier for Wireless Applications

Novel Design of a 10 dB Back-Off Broadband Sequential Dohert...

引用

IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications

作者： Nghiem, Xuan Anh Negra, Renato Rhein Westfal TH Aachen UMIC Res Ctr Mixed Signal CMOS Circuits D-52056 Aachen Germany

ISBN: (纸本)9781479927784

This paper presents the design and experimental results of a broadband sequential Doherty power amplifier (S-DPA). This new type of DPA allows large back-off (BO), highly efficient and broadband DPAs to be realised. A 10 W/10 dB BO S-DPA is designed to verify the design concept. Measurement results show obvious Doherty behaviour with 8 - 11 dB output power back-off over a 1.85 - 2.4 GHz frequency range. A drain efficiency of 65 % over 300 MHz at BO and >= 58 % over 500 MHz bandwidth at saturation is obtained. To show the state-of-the-art of the S-DPA, the drain efficiency at 2.0 GHz is selected with 74.5 % at saturation and 67.3 % at 10 dB BO. Linearised measurement with a 10 MHz LTE signal having a crest factor of 7.5 dB at 2.1 GHz exhibits an average drain efficiency of 53 % and an adjacent channel leakage ratio (ACLR) of -44.2/ -48.7 dBc at an average output power of 32.7 dBm. To the best of the author's knowledge, this is the first wideband, 10 dB BO DPA with such high efficiency reported so far.

关键词： Broadband sequential Doherty power amplifier (S-DPA) GaN HEMT efficiency enhancement

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Highly Linear 1.6 GHz 3.3V RF Power Amplifier Using Floating Body Technique In Triple-well 130 nm cmos Technology

Highly Linear 1.6 GHz 3.3V RF Power Amplifier Using Floating...

引用

IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications

作者： Khan, Muhammad Abdullah Negra, Renato Rhein Westfal TH Aachen UMIC Res Ctr Mixed Signal CMOS Circuits D-52056 Aachen Germany

ISBN: (纸本)9781479927784

Power amplifiers (PAs) in cmos technology have drawn considerable interest for meeting 4th generation (4 G) wireless standards due to their low cost and high level of integration. At increasing power levels, (around 1 W), it becomes challenging to meet the linearity constraints. In this paper, we investigate a differential common source class-AB RF PA employing floating body and compare it with a body-source shorted version. We use triple-well NMOS RF devices at 1.6 GHz in 130nm cmos technology. Linearity is improved for the floating body based amplifier in terms of AM/PM and 3rd order intermodulation (IMD3) suppression by 1.8 degrees and 1.5 dBc at P-1dB as compared to a body-source shorted amplifier. The linearity is evident over all output power (P-out) levels. The linear gain is reduced by 0.42 dB due to increased coupling between drain and source terminals while the PAE is increased by 1.6% at P-1dB for floating body based amplifier.

关键词： Floating bodies cmos technology P1dB Amplifiers RF power amplifier Linearity rise level

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High Dynamic-Range and Sensitivity Six-port Receiver Using Reactive Matching Technique

High Dynamic-Range and Sensitivity Six-port Receiver Using R...

引用

8th IEEE Radio and Wireless Symposium (RWS)

作者： Qayyum, Saad Wei, Muh-Dey Negra, Renato Rhein Westfal TH Aachen UMIC Res Ctr Mixed Signal CMOS Circuits D-52056 Aachen Germany

ISBN: (纸本)9781479921812

Six-port receivers have increasingly become popular due to their simple design, wide bandwidth and low power consumption. Large area and narrow dynamic range are the key factors in limiting the use of six-port topology in commercial mobile communication devices. In order to improve its dynamic range, we propose an L-type reactive matching network for the detector stage of the six-port receiver. The proposed six-port receiver covers the frequency band from 1 GHz to 3.3 GHz. Over the specified band, it has an EVM of less than 4 % with -20 dBm of RF input power and 15 dBm of LO power. At 2.2 GHz, it has 64 dB of dynamic range with EVM between 0.33 % and 10.5 %.

关键词： Dynamic range Receivers RF input power Frequency bands REACTIVE key factors matching network

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