An 87.1% efficiency RF-PA envelope-tracking modulator for 80MHz LTE-Advanced transmitter and 31dBm PA output power for HPUE in 0.153μm CMOS

Ho, Chen-Yen; Lin, Shaw‐Tao; Meng, Che-Hao; Hong, Hao-Ping; Yan, Sheng-Hong; Kuo, T. Y. T.; Peng, Chia-Sheng; Hsiao, Chieh-Hsun; Chen, Hsin-Hung; Sung, Da-Wei; Kuan, Chien-Wei

doi:10.1109/isscc.2018.8310369

Cited by 21 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A common problem of [10,12,13] is that they all need additional off-chip inductors to build the auxiliary buck converters, static or modulated. Typically, the inductance needed in the auxiliary buck converter is even larger than L of the main buck converter.…”

Section: Methods 1: Voltage Reductionmentioning

confidence: 99%

Envelope Tracking Supply Modulator with Trellis-Search-Based Switching and 160-MHz Capability

Leng

Abidi

Mundlapudi

et al. 2022

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

Envelope tracking is widely used to raise the efficiency of PAs. An envelope tracking supply modulator (ETSM) modulates PA's supply voltage to tracks the RF waveform's envelope, so that the PA will operate in saturation all the time. A hybrid amplifier is commonly used to realize the ETSM, which, in effect, partitions the envelope bandwidth into a low and high subband. An efficient switching buck converter tracks the low band. In parallel with it, an op-amp supplies the current in the high band. In prior arts, the hybrid amplifier is realized with feedback using a hysteresis comparator, whose output actuates the buck converter to respond to the changing envelope; the continuous-time op-amp makes up for the error. But a comparator-driven buck converter produces a slew-rate limited current that always lags the envelope waveform. This forces the op-amp to produce a larger current to correct the error, and the arrangement cannot guarantee that the buck converter switches no often than is absolutely necessary. We replace the hysteresis comparator with a novel trellis-search that, first, finds the optimal sequence to switch the buck converter to minimize the RMS current that the op-amp must deliver; second, to lower the loss from switching the capacitance of FETs, it penalizes a large number of switching events in the buck converter.Meanwhile, with a conventional on-chip hysteresis comparator, we can demonstrate ETSM operation up to 160 MHz modulation bandwidth. This is the widest bandwidth reported so far for any ETSM.ii The dissertation of Weiyu Leng is approved.

show abstract

Section: Methods 1: Voltage Reductionmentioning

confidence: 99%

Envelope Tracking Supply Modulator with Trellis-Search-Based Switching and 160-MHz Capability

Leng

Abidi

Mundlapudi

et al. 2022

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

show abstract

“…In later arts, a buck-boost (BB) converter is usually included in the SM to generate a stable and high voltage V BB as the supply for the switching converter and linear amplifier with enough headroom to generate the maximum V PA [17], [18]. The buck-boost was cascaded with a buck converter rather than directly use the buck-boost as the switching converter because a buck-boost has slow response with a right-halfplane (RHP) zero.…”

Section: Voltage Step-up and Step-downmentioning

confidence: 99%

“…The buck-boost was cascaded with a buck converter rather than directly use the buck-boost as the switching converter because a buck-boost has slow response with a right-halfplane (RHP) zero. With the additional higher-than-battery voltage V BB , dual-power-line (DPL) buck converter is proposed in [17] and [18] as shown in Fig. 5.…”

Section: Voltage Step-up and Step-downmentioning

confidence: 99%

Design Techniques for High-Efficiency Envelope-Tracking Supply Modulator for 5th Generation Communication

Liu

Jiang

Huang

et al. 2022

IEEE Trans. Circuits Syst. II

View full text Add to dashboard Cite

This brief provides a brief tutorial on designing a high efficiency envelope-tracking supply modulator with recent techniques. Design challenges for 5G communication applications are given. Detailed techniques covering topology derivation, multi-level and fast-speed switching converter design considerations, voltage step-up and -down function implementations, linear amplifier bandwidth improvements and measurement setup are discussed, providing design guidelines and considerations.

show abstract

“…After that, studies on ETPAs that use both APT and ET modes were focused on, because both the modes become available to the usual handsets [37], [38]. One of the studies reported on a 80-MHz wide bandwidth ET operation acceptable for LTE-advanced.…”

Section: Progress Of Envelope Tracking Power Amplifiermentioning

confidence: 99%

Recent Progress in Envelope Tracking Power Amplifiers for Mobile Handset Systems

Mukai

Okabe

Tanaka

2021

IEICE Trans. Electron.

View full text Add to dashboard Cite

The Fifth-Generation new radio (5G NR) services that started in 2020 in Japan use a higher peak-to-average power ratio (PAPR) of a modulated signal with a maximum bandwidth of up to 100MHz and support multi-input/multi-output (MIMO) systems even in mobile handsets, compared to the Third-Generation (3G) and/or Fourth-Generation (4G) handsets. The 5G NR requires wideband operation for power amplifiers (PAs) used in handsets under a high PAPR signal condition. The 5G NR also requires a number of operating bands for the handsets. These requirements often cause significand degradation of the PA efficiency, consequently. The degradation is due to wideband and/or high PAPR operation as well as additional front-end loss between a PA and an antenna. Thus, the use of an efficiency enhancement technique is indispensable to 5G NR handset PAs. An envelope tracking (ET) is one of the most effective ways to improve the PA efficiency in the handsets. This paper gives recent progress in ET power amplifiers (ETPAs) followed by a brief introduction of ET techniques. The introduction describes a basic operation for an ET modulator that is a key component in the ET techniques and then gives a description of some kinds of ET modulators. In addition, as an example of a 5G NR ETPA, the latest experimental results for a 5G ETPA prototype are demonstrated while comparing overall efficiency of the ET modulator and PA in the ET mode with that in the average power tracking (APT) mode.

show abstract

An 87.1% efficiency RF-PA envelope-tracking modulator for 80MHz LTE-Advanced transmitter and 31dBm PA output power for HPUE in 0.153μm CMOS

Cited by 21 publications

References 3 publications

Envelope Tracking Supply Modulator with Trellis-Search-Based Switching and 160-MHz Capability

Envelope Tracking Supply Modulator with Trellis-Search-Based Switching and 160-MHz Capability

Design Techniques for High-Efficiency Envelope-Tracking Supply Modulator for 5th Generation Communication

Recent Progress in Envelope Tracking Power Amplifiers for Mobile Handset Systems

Contact Info

Product

Resources

About