Multimode 2.4 GHz CMOS power amplifier with gain control for efficiency enhancement at power backoff

Santos, Edson Leonardo dos; Leite, Bernardo; Mariano, André

doi:10.1109/lascas.2015.7250427

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…If compared at a P OUT of 18 dBm, [6] consumes 1.6 times more P DC than this work and occupies a 3.2 times larger area. Due to reconfigurability in gain stage, [5] achieves a peak power gain 15 dB higher than this work. IV.…”

Section: Resultsmentioning

confidence: 73%

“…The highest OCP 1dB and P SAT values are achieved respectively by [6] and [8], which employ differential amplifiers architectures and occupy significantly more silicon area than the other works. Among the circuits that do not use differential topologies, such as [2], [5] and this work, [2] achieves the highest OCP 1dB and P SAT by using a higher supply voltage and off-chip biasing voltage and choke inductors. If compared at a P OUT of 18 dBm, [6] consumes 1.6 times more P DC than this work and occupies a 3.2 times larger area.…”

Section: Resultsmentioning

confidence: 96%

“…To obtain selectable efficiency levels, Santos et al implement a control circuit to enable or disable differently sized transistors in the gain stage [5]. On the other hand, Yoon et al use a control circuit to enable or disable differently sized transistors in the power stage [2].…”

Section: Introductionmentioning

confidence: 99%

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2.4 GHz CMOS digitally programmable power amplifier for power back-off operation

Santos

Mariano

Leite

2016

2016 IEEE 7th Latin American Symposium on Circuits &Amp; Systems (LASCAS)

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This paper presents the simulation results of a linear, fully integrated, two-stage digitally programmable 130 nm CMOS power amplifier (PA) operating at 2.4 GHz. Its power stage is composed of a set of amplifying cells which can be enabled or disabled independently by a digital control circuit. All seven operational modes are univocal in terms of 1 dB output compression point (OCP1dB), saturated output power (PSAT) and power gain at 2.4 GHz. The lowest power mode achieves an 8.1 dBm PSAT, a 13.5 dB power gain and consumes 171 mW DC power (PDC) at an OCP1dB of 6 dBm, whereas the highest power mode reaches an 18.9 dBm PSAT and a 21.1 dB power gain and consumes 415 mW PDC at an OCP1dB of 18.2 dBm.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 96%

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2.4 GHz CMOS digitally programmable power amplifier for power back-off operation

Santos

Mariano

Leite

2016

2016 IEEE 7th Latin American Symposium on Circuits &Amp; Systems (LASCAS)

Self Cite

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“…where, we remark that although (11) is very similar to (8), the outage probability of AS is lower than that of SISO, due to the exponent n t n r in (10), while the power consumption is similar, once a single RF chain is active at each side in both schemes. Thus, it is expected that AS yields a higher energy efficiency than SISO.…”

Section: B Antenna Selection (As)mentioning

confidence: 68%

“…For this reason, we can change the circuit operating point, i.e., reduce the performance without prejudice to the target communication, and thus save energy. In this way, the use of reconfigurable circuits is seen as a possible solution to acquire greater energy autonomy, in which the trade-off between higher performance and lower consumption can be adjusted according to the communication scenario [10]. Therefore, the design of power-efficient reconfigurable RF transceivers combined with the spatial diversity benefit of using multiple antennas has become a key aspect in extending the lifetime of wireless devices [11].…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency in Multiple Antenna Machine-Type Communications With Reconfigurable RF Transceivers

et al. 2019

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In machine-type communication (MTC) networks, each node is equipped with a set of radiofrequency (RF) transceivers, antennas and power source. Besides, wireless nodes are typically batterypowered, whose recharging or replacement is often not viable or even impossible. Therefore, in such systems where energy is at a premium, minimizing power consumption improves energy efficiency and increases battery lifetime. In this paper, a novel energy-saving approach includes in the communication system model the use of reconfigurable RF transceivers. More specifically, the components involved in our power minimization framework are the power amplifier (PA) at the transmitter and the low noise amplifier (LNA) at the receiver, which are the blocks responsible for RF amplification and are on top of power consuming blocks in RF transceivers. Our goal is to show that RF circuits based on multimode operation can significantly improve the energy efficiency. We perform a joint selection of the best operating modes for PA and LNA circuits in different communication scenarios. Results show that by combining PA and LNA operating modes, an improvement of more than 75% in energy efficiency is obtained for multiple antenna communications, when compared to the state-of-the-art literature of non-reconfigurable amplifiers. Besides, we show that adapting spectral efficiency contributes towards improving energy efficiency. In this case, we consider different spectral efficiency values, including the effect that the PA operates at different backed-off power levels. In addition, when comparing single-input single-output (SISO) and multiple-input multiple-output (MIMO) transmission schemes, antenna selection (AS) outperforms the others schemes in terms of energy efficiency for short and moderate distances, but singular value decomposition (SVD) allows for longer communication distances. INDEX TERMS Energy efficiency, reconfigurable RF transceivers, machine-type communications, multiple antennas.

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Reduced-Complexity Polynomials with Memory Applied to the Linearization of Power Amplifiers with Real-Time Discrete Gain Control

Schuartz

Santos

Leite

et al. 2019

Circuits Syst Signal Process

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Multimode 2.4 GHz CMOS power amplifier with gain control for efficiency enhancement at power backoff

Cited by 3 publications

References 8 publications

2.4 GHz CMOS digitally programmable power amplifier for power back-off operation

2.4 GHz CMOS digitally programmable power amplifier for power back-off operation

Energy Efficiency in Multiple Antenna Machine-Type Communications With Reconfigurable RF Transceivers

Reduced-Complexity Polynomials with Memory Applied to the Linearization of Power Amplifiers with Real-Time Discrete Gain Control

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