Phase error free linc modulator

Tomisato, Shigeru; Chiba, K.; Murota, K.

doi:10.1049/el:19890392

Cited by 43 publications

(12 citation statements)

References 1 publication

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“…Then, this I/Q pairs of signals are up-converted to RF by two mixers. The SCS can be realized with either analog circuits [6][7] or a DSP [8][9][10]. In either case, a significant portion of the circuit is still analog, and any mismatch in phase or amplitude between two paths can potentially ruin the performance of the whole transmitter.…”

Section: Conventional Scs Techniquesmentioning

confidence: 99%

A CMOS Outphasing Transmitter Using Two Wideband Phase Modulators

Lee¹,

Kım²,

Song³

et al. 2011

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper describes a CMOS outphasing transmitter using two wideband phase modulators. The proposed architecture can simplify the overall outphasing transmitter architecture using two-point phase modulation in phase-locked loop, which eliminates the necessity digital-to-analog converters, filters, and mixers. This architecture is verified with a WCDMA signal at 1.65 GHz. The prototype is fabricated in standard 130 nm CMOS technology. The measurement results satisfied the spectrum mask and 4.9% EVM performance.

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Section: Conventional Scs Techniquesmentioning

confidence: 99%

A CMOS Outphasing Transmitter Using Two Wideband Phase Modulators

Lee¹,

Kım²,

Song³

et al. 2011

JSTS:Journal of Semiconductor Technology and Science

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“…When connects to the upper branch, called state "A," we have (15) where stands for the signal amplitude of the mixer branch, and is the phase delay. The downconversion mixer multiplies the LINC output (14) with (15). After low-pass filtering, we obtain (16) where is the loop gain and consists of the loop phase delay and the phase shift introduced by the downconversion mixer.…”

Section: A Algorithm Theorymentioning

confidence: 99%

“…This is nearly impossible to achieve in most practical situations, and several attempts have been made to correct for the errors. A "phase-only" correction was proposed in [14]. A simplex search algorithm was proposed in [15] to correct for both gain and phase errors.…”

Section: Introductionmentioning

confidence: 99%

Gain/phase imbalance-minimization techniques for LINC transmitters

Zhang

Larson

Asbeck

et al. 2001

IEEE Trans. Microwave Theory Techn.

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Two simple calibration schemes for the correction of the path imbalance in a linear amplification with nonlinear components (LINC) transmitter have been demonstrated. In the foreground algorithm, a baseband digital signal processor (DSP) evaluates the gain and phase imbalance with a set of calibration signals, while in the background algorithm, the imbalance is characterized by exchanging the two LINC vector components. In both cases, the compensation of the path imbalance is accomplished within the DSP by introducing a predistortion term. A prototype LINC system has been tested for CDMA IS-95 baseband input, and 38 and 35-dBc adjacent channel interference were achieved for the foreground and background schemes, respectively. The quadrature errors of the in-phase/quadrature modulators set a limit on the overall performance of both algorithms.

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“…6 shows the iteration in which the genetic algorithm stops, called iteration of finalization or convergence, for a great number of simulations (1000 trials). It can be seen that the genetic algorithm converges, in the most situations, in [3][4] iterations and in the worst case are 9 iterations. Thus, the algorithm obtains a solution for complex coefficients in a few iterations.…”

Section: A Genetic Algorithm Parametersmentioning

confidence: 98%

“…Its major drawback is inherited sensitivity to gain and phase imbalances between the two amplifier branches [1,2]. Several authors have considered methods to correct the imbalances in LINC transmitters [3][4][5][6][7], but the presented method is based on genetic algorithms (GA) [8][9] and it converges in a few iterations. It is carried out in base-band and is full-digital.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Distortion Cancellation in a LINC Transmitter using Genetic Algorithms

García

Mingo

Valdovinos

2005 2nd International Symposium on Wireless Communication Systems

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The LInear amplification using Nonlinear Components (LINC) technique is a well-known power amplifier linearization method to reduce adjacent channel interference in a nonconstant envelope modulation system. Its major drawback is the inherited sensitivity to gain and phase imbalances between the two amplifier branches. This work describes a method to correct gain and phase imbalances in LINC transmitters. The proposed method is based on genetic algorithms and it obtains a suitable solution for complex coefficients to adjust gain and phase imbalances. The method functionality has been verified by means of simulation.

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Phase error free linc modulator

Cited by 43 publications

References 1 publication

A CMOS Outphasing Transmitter Using Two Wideband Phase Modulators

A CMOS Outphasing Transmitter Using Two Wideband Phase Modulators

Gain/phase imbalance-minimization techniques for LINC transmitters

Nonlinear Distortion Cancellation in a LINC Transmitter using Genetic Algorithms

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