Switched state-space model for a switched-capacitor power amplifier

Trampitsch, Stefan; Knoblinger, G.; Huemer, Mario

doi:10.1109/iscas.2015.7168924

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…To show this, the RF-DAC is simplified to the model shown in Fig. 3 [41]. All active and inactive cells are combined to two equivalent impedances, respectively.…”

Section: B Effects Of Supply Voltage Variationsmentioning

confidence: 99%

“…All active and inactive cells are combined to two equivalent impedances, respectively. Without loss of generality, C u represents the (assumed) unitary capacitance of every cell and R u is the equivalent ON-resistance of the drivers' pMOS and nMOS [41]. The active cells are assumed to be connected to V DD .…”

Section: B Effects Of Supply Voltage Variationsmentioning

confidence: 99%

“…Fig. 5 shows the PSDs of a simulated polar capacitive RF-DAC with ideal and nonideal supply network, respectively, using the switched linear state-space modeling approach presented in [34] and [41], which allows to analyze the impact of a nonideal supply network on an (chosen) idealized model of the RF-DAC.…”

Section: B Effects Of Supply Voltage Variationsmentioning

confidence: 99%

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A Circuit-Inspired Digital Predistortion of Supply Network Effects for Capacitive RF-DACs

Trampitsch

Kalcher²,

Enzinger³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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This article presents a novel digital predistortion (DPD) approach to compensate for nonlinear dynamic distortions caused by the supply network of capacitive radio frequency digital-to-analog converters (RF-DACs). The developed DPD concept recreates the voltage distortion on the RF-DAC's supply network and modulates the input signal such that the effects on the output signal of the RF-DAC are canceled. In contrast to conventional DPD approaches such as pruned Volterra series or memory polynomials, the complexity of the proposed concept is reduced to a feasible level, allowing for implementation in integrated circuits. Furthermore, the derived DPD model allows to use linear estimation algorithms for coefficient training. The presented DPD is demonstrated by measurements of two different capacitive RF-DAC designs and compared with conventional DPD approaches. EVM and adjacent channel power ratio (ACPR) can be improved by up to 6 and 7 dB, respectively, outperforming conventional approaches. Index Terms-Digital predistortion (DPD), memory effects, memory polynomial (MP), power amplifier (PA), radio frequency digital-to-analog converter (RF-DAC), switched-capacitor power amplifier (SCPA), Volterra series. I. INTRODUCTION T HE demand for high data rates, robust transmissions, and power efficiency poses stringent requirements on the design of integrated wireless transceiver systems. Increasing the data rate, while simultaneously providing a reliable and power-efficient transmission, is closely related to the linearity of the communication systems. In radio frequency (RF) wireless communication transmitters, the key component in terms of linearity and Manuscript

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“…To show this, the RF-DAC is simplified to the model shown in Fig. 3 [41]. All active and inactive cells are combined to two equivalent impedances, respectively.…”

Section: B Effects Of Supply Voltage Variationsmentioning

confidence: 99%

Section: B Effects Of Supply Voltage Variationsmentioning

confidence: 99%