Device and circuit approaches for improved linearity and efficiency in microwave transmitters

Asbeck, P.M.; Itoh, T.; Qian, Yongxi; Chang, Michael; Milstein, L.B.; Hanington, G.; Chen, P.F.; Schultz, Villads; Lee, D.W.; Arun, J.

doi:10.1109/mwsym.1998.689385

Cited by 3 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calibrated time-domain envelope measurement system has been used to validate a power transistor linearization technique [19]- [21]. It has been applied to a Fujitsu FLK10XM power transistor operating in class A ( V, mA, V) at 1.6 GHz.…”

Section: A Linearization Of a Power Transistormentioning

confidence: 99%

Time-domain envelope measurements for characterization and behavioral modeling of nonlinear devices with memory

Macraigne

Reveyrand

Neveux

et al. 2006

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

Abstract-This paper presents a calibrated four-channel measurement system for the characterization of nonlinear RF devices such as power amplifiers. The main goal of this study is to perform the characterization of the bandpass response of a nonlinear device-under-test (DUT) driven by modulated carriers. The proposed setup enables the generation of -o r -band (1-4 GHz) carriers with a modulation bandwidth up to 100 MHz. The carrier harmonics generated by the nonlinear DUT are ignored and considered to be sufficiently filtered. This characterization setup enables calibrated time-domain measurements of the complex envelopes of both incoming and outgoing RF waves at the input and output of the DUT. This means that the fundamental and harmonic frequencies of the envelope are measured and processed. A large set of modulation formats can be generated by using a computer-controlled arbitrary waveform generator. Complex envelopes are measured by using a four-channel sampling scope. The proposed calibrated setup can be used to study or to validate linearization techniques of power amplifiers. This characterization tool is also well suited for the extraction and validation of behavioral bilateral models of nonlinear RF analog equipment exhibiting memory effects.

show abstract

Section: A Linearization Of a Power Transistormentioning

confidence: 99%

Time-domain envelope measurements for characterization and behavioral modeling of nonlinear devices with memory

Macraigne

Reveyrand

Neveux

et al. 2006

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…During the off-time, this energy is released and used to charge the output capacitor to the peak of the ring voltage and provide energy to the load. With the condition that the maximum ON time is 50% of the switching period, and that the operation of this converter is in the discontinuous mode, the maximum inductor value that can be used for energy storage is (4) Larger values limit the peak current and energy. This assumes a linear current ramp during the ON time and a rapid decreasing ramp in the OFF time.…”

Section: Dc-dc Boost Convertermentioning

confidence: 99%

“…To properly gauge the effect of efficiency improvement, it is necessary to account for the probability distribution of power usage as a function of the output power [4], [5]. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications

Hanington

Chen

Asbeck

et al. 1999

IEEE Trans. Microwave Theory Techn.

Self Cite

326

View full text Add to dashboard Cite

Efficiency and linearity of the microwave power amplifier are critical elements for mobile communication systems. This paper discusses improvements in system efficiency that are obtainable when a dc-dc converter is used to convert available battery voltage to an optimal supply voltage for the output RF amplifier. A boost dc-dc converter with an operating frequency of 10 MHz is demonstrated using GaAs heterojunction bipolar transistors. Advantages of 10-MHz switching frequency and associated loss mechanisms are described. For modulation formats with time-varying envelope, such as CDMA, the probability of power usage is described. Gains in power efficiency and battery lifetime are calculated. An envelope detector circuit with a fast feedback loop regulator is discussed. Effects of varying supply voltage with respect to distortion are examined along with methods to increase system linearity.

show abstract

Device and circuit approaches for improved wireless communications transmitters

et al. 1999

View full text Add to dashboard Cite

Device and circuit approaches for improved linearity and efficiency in microwave transmitters

Cited by 3 publications

References 2 publications

Time-domain envelope measurements for characterization and behavioral modeling of nonlinear devices with memory

Time-domain envelope measurements for characterization and behavioral modeling of nonlinear devices with memory

High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications

Device and circuit approaches for improved wireless communications transmitters

Contact Info

Product

Resources

About