Integrated tunable systems for scalable 4G radios

Morris, Arthur S.; Steel, Victor

doi:10.1109/mwsym.2013.6697717

Cited by 14 publications

(5 citation statements)

References 10 publications

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“…Ramp signal is also required to test INL and DNL performance of ADC, which can be taken from test signal generated by TSG after converting in to ramp signal. Digital resolution based lossless (LDI) discrete integrator is used as TSG [2]. The resonators are obtained by cascading to integrator which, can be seen in Figure 6.…”

Section: Test Stimulus Generation and Power Estimation Of Tsgmentioning

confidence: 99%

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Analysis of Quantization Noise and Power Estimation of Continuous-Time Delta Sigma Analog-to-Digital Converter Using Test Enable Feature For 4G Radios

Sahu¹,

Chandra²,

Sinha³

2018

IJ-ICT

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<span>This paper presents a novel approach for completely test enable feature and low-voltage delta– sigma analog-to-digital (A/D) converters for cutting edge wireless applications. Oversampling feature of ADCs and DACs is enough to meet the requirement related to in-band and adjacent channel leakage ratio (ACLR) execution of 3G/4G portable radio. The quantization noise which is not filtered in ADC is addressed. We have achieved work power-optimization and test enable feature of oversampling ADC is uses in design and simulation so that the problem of quantization error in continues time sigma delta ADC is solved. This paper suggests support to designer for selecting appropriate topologies with various channel arrangements, number of bits and oversampling issues. A test enable feature of CT A/D is presented introducing the test signal generation (TSG) and the COrdinate Rotation Digital Computer (CORDIC) for evaluating the performance of ADC. This helps in addressing the challenge of 4G and upcoming 5G wireless radio. System level plan of a delta–sigma modulator ADC for 4G radios is studied</span><span lang="IN">.</span>

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Section: Test Stimulus Generation and Power Estimation Of Tsgmentioning

confidence: 99%

“…This type of innovation could enable the remote interchanges frameworks to relocate and help multiband and multi-standard radios, RF front-end/back-end, and advanced baseband systems. The drivers for mobile wireless communications are standards and protocols, frequency bands, power consumption, size, and cost [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Quantization Noise and Power Estimation of Continuous-Time Delta Sigma Analog-to-Digital Converter Using Test Enable Feature For 4G Radios

Sahu¹,

Chandra²,

Sinha³

2018

IJ-ICT

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“…The fractional bandwidth upper bond is generally estimated by (3) for a single-mode antenna where s is the voltage standing wave ratio, r the radiation efficiency, k=2 /λ and a the minimum radius of a sphere enclosing the antenna. (1) In this paper, a miniature antenna for LTE is developed and co-designed with a linear PA operating at 900MHz. It has a narrow bandwidth and works instantaneously in the operator band (9 MHz).…”

Section: Small Antennasmentioning

confidence: 99%

“…Different methods to optimize the RFFE have been presented and discussed in various studies [1][2]. Small antennas could be a part of the solution and a co-design power amplifier (PA) with small antenna may be a method to tackle the challenges associated with an optimized compact RFFE.…”

Section: Introductionmentioning

confidence: 99%

Impact of small antenna on linear power amplifier performance in a co-design approach

Abdallah

Giry

Bories

et al. 2015

2015 IEEE 13th International New Circuits and Systems Conference (NEWCAS)

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The main objective of this study is to determine the impact of a co-designed small antenna on linear power amplifier (PA) performances. Special attention is paid to load-pull optimization to derive suitable values of the antenna input impedance at the operating frequency and the first higher-order harmonics. The impact of the antenna impedance profile in the operational band on PA performance is also addressed. It is found that the PA is more linear, when its operating frequency is below the antenna resonance, compared to other configurations. A microstrip patch antenna which provide the optimal impedance is developed and results demonstrate the benefits of the co-design approach with new antenna.

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“…In order to match the antenna over a wide frequency range, two different methods have been proposed and used: a) a CLC (fixed inductor and two variable capacitors) antenna matching network between the antenna and the PAIS witch network, and b) antenna aperture tuning where the antenna resonant impedance is changed using a switched capacitor connected inside the antenna [1][2][3][4][5]. Both methods have their advantages.…”

Section: Introductionmentioning

confidence: 99%

Improving 3G/4G receiver sensitivity (TIS) using antenna impedance matching networks

Lin

Rebeiz

2014

2014 IEEE MTT-S International Microwave Symposium (IMS2014)

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This paper explores new applications for antenna impedance matching networks. It is seen that a tunable matching network can improve the cell phone system noise figure and total integrated sensitivity (TIS) by at -1 dB at 700 MHz -3 GHz. The reason is that a mismatched low-noise amplifier has a higher noise figure and a lower gain than a noise-matched LNA, and therefore, a tunable matching network is important for noise matching in receiver applications. This would lead to shorter download times and more efficient 3G and 4G mobile networks.Index Terms -Tunable circuits and devices, cellular phones, RLC circuits, radio-frequency micro-electro-mechanical systems.Detailed diagram of the receive path, from the antenna port to the transceiver. drops from 12.4 dB to 10-6 dB and the NF increases from dB to 1.9-4.5 dB at a VSWR ofS-lO, respectively. The reason is that the LNA noise emanating from the gate is reflected back to the amplifier by the antenna mismatch and this increases the LNA noise figure. These values degrade the system performance, even for a VSWR of 5. Note that the LNA is followed by a mixer and baseband amplifiers with a noise figure of 6-7 dB, and therefore, a reduction in the LNA gain (and increase in the LNA noise) can have a significant impact on the transceiver performance. In fact, assuming a mixer+baseband NF of 7 dB, the transceiver chip NF degrades from 1.7 dB for a 50 Q source impedance to 2.7 dB for a VSWR of 5 (Fig. 4).Fortunately, the effect of the antenna mismatch is not as drastic as shown above due to the presence of a 2.4 dB switch+filter loss (0.8+1.6 dB) between the antenna and the LN A, which results in a system NF (defmed at the antenna port) of 4.1 dB for a 50 Q antenna impedance. The antenna impedance is also attenuated by 4.8 dB on the Smith chart, and a VSWR of 10 becomes 2.8 at the amplifier input port.This results in an LNA gain of 10.5 and a NF of 1.7 which yields a system NF of 5.1 dB at the antenna port. The system NF is 1 dB larger than a matched antenna and degrades the link margin at the edge of the coverage area, or in poor signal conditions. Therefore, the use of an impedance matching network in the Rx mode to improve the antenna impedance to

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Integrated tunable systems for scalable 4G radios

Cited by 14 publications

References 10 publications

Analysis of Quantization Noise and Power Estimation of Continuous-Time Delta Sigma Analog-to-Digital Converter Using Test Enable Feature For 4G Radios

Analysis of Quantization Noise and Power Estimation of Continuous-Time Delta Sigma Analog-to-Digital Converter Using Test Enable Feature For 4G Radios

Impact of small antenna on linear power amplifier performance in a co-design approach

Improving 3G/4G receiver sensitivity (TIS) using antenna impedance matching networks

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