An MMAC C-band FET feedback power amplifier

Ezzeddine, A.; Hung, H.-L.A.; Huang, H.C.

doi:10.1109/22.52574

Cited by 19 publications

(9 citation statements)

References 5 publications

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“…The varistor, i.e., variable resistor, is a basic element for amplitude control and is commonly used in variable attenuators [4] and variablegain amplifiers [5]. For MSP realization, the cold-FET varistor is appropriate because it dissipates dc power (much less dc power) than do traditionally used p-i-n-diode varistors.…”

Section: Repofet Varistormentioning

confidence: 99%

Voltage-controlled biphase attenuator and vector synthesizer for monolithic microwave signal processors

Suzuki

Ohira²,

Ogawa³

1998

IEEE Trans. Microwave Theory Techn.

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A GaAs monolithic voltage-controlled biphase attenuator and a vector synthesizer, which utilize remote-pinchoff cold field-effect transistors (RePOFET's), are newly developed for microwave signalprocessor applications. Their features are very small circuit size, which permits dense integration, and high control linearity. Lumped-constant topologies and internal impedance optimization successfully reduce the sizes of the attenuator and vector synthesizer to just 0.5 and 2.1 mm 2 , respectively. The control sensitivity deviation exhibited is within 65% for over 50% of the full control range. The uniformity of the measured vector constellation is also improved by the RePOFET's.

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Section: Repofet Varistormentioning

confidence: 99%

Voltage-controlled biphase attenuator and vector synthesizer for monolithic microwave signal processors

Suzuki

Ohira²,

Ogawa³

1998

IEEE Trans. Microwave Theory Techn.

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“…In addition to the feedforward method, Seidel also introduced a feedback amplifier [14,15], which utilizes the main and error amplifiers with three signal coupling devices used to degenerate the error signal generated by the main amplifier by introducing a feedback loop [16][17][18][19][20]. McRory et al [16] mathematically analyzed the same structure based on the Volterra series.…”

Section: Introductionmentioning

confidence: 99%

“…This limited bandwidth of feedback amplifier originates from the GD mismatching generated in the feedback loop by the feedback transmission time. In the conventional researches the minimum feedback time is assumed, but in a practical situation the assumption is not valid because of the transmission time of the MPA, EPA, and other signal adjusting devices including the band-pass filter [19,20].…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Enhancement of an Analog Feedback Amplifier by Employing a Negative Group Delay Circuit

Choi¹,

Jeong²,

Kim³

et al. 2010

PIER

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Abstract-We will demonstrate an alternative topology to greatly increase the operating bandwidth of an analog RF feedback power amplifier. A limited operating bandwidth due to the group delay mismatch of a feedback loop discouraged the use of an RF feedback technique in spite of its powerful linearization performance and great tolerance capability. By introducing a negative group delay circuit (NGDC) in the feedback loop, group delay match condition could be satisfied. With the fabricated 2-stage distributed element negative group delay circuit with a 30 MHz of bandwidth and a −9 ns of group delay for a wideband code division multiple access (WCDMA) downlink band, the proposed feedback amplifier with the proposed topology experimentally achieved an adjacent channel leakage ratio of −53.2 dBc with a cancellation bandwidth of over 50 MHz.Corresponding author: Y. Jeong (ycjeong@jbnu.ac.kr). 254Choi et al.

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“…Most common techniques are feedback [4,5], feed-forward [6][7][8][9][10][11][12][13] and predistortion techniques [14][15][16][17][18][19][20][21][22][23][24][25][26]. Conventional feedback method suffers from the disadvantages such as instability and bandwidth limitation [2,3].…”

Section: Introductionmentioning

confidence: 99%

Genetic algorithm optimization of a hybrid analog/digital predistorter for RF power amplifiers

Çiflikli

Yapici

2007

Analog Integr Circ Sig Process

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This study presents a genetic algorithm optimization of a hybrid analog/digital predistorter, in order to reduce the intermodulation distortion (IMD) caused by the nonlinear properties of the radio frequency (RF) power amplifier (PA). Designed predistorter based on polynomial work function and the coefficient of the polynomial is optimized in order to reduce IMD by spectrum monitoring. The design procedure and validation of predistorter have been carried out by Agilent-ADS2005A. In order to validate the predistorter two different modulation schemes as CDMA and 16-QAM have been used. Also in order to verifying the linearization a test power amplifier circuit has been examined including Motorola MOSFET MRF9742 showing the nonlinear characteristics with memory. Simulations have been shown that adjacent channel power ratio (ACPR) improvements were acceptable for both CDMA and 16-QAM modulation schemes.

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An MMAC C-band FET feedback power amplifier

Cited by 19 publications

References 5 publications

Voltage-controlled biphase attenuator and vector synthesizer for monolithic microwave signal processors

Voltage-controlled biphase attenuator and vector synthesizer for monolithic microwave signal processors

Bandwidth Enhancement of an Analog Feedback Amplifier by Employing a Negative Group Delay Circuit

Genetic algorithm optimization of a hybrid analog/digital predistorter for RF power amplifiers

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