Detailed distortion analysis technique based on simulated large-signal voltage and current spectra

Aikio, Janne; Rahkonen, Timo

doi:10.1109/tmtt.2005.855132

Cited by 45 publications

(40 citation statements)

References 17 publications

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“…The FET's dominant nonlinearity can be represented by polynomial model in the form of Taylor's series as given by equation (1) (Pedro and Perez, 1994;Aikio and Rahkonen, 2005;Heiskanen et al, 2003) …”

Section: Theoretical Analysismentioning

confidence: 99%

See 1 more Smart Citation

Mixer Linearization by Modified Baseband Signals

Đorić¹,

Males-Ilic²,

Atanasković³

et al. 2016

Proceedings of the International Scientific Conference - Sinteza 2016

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Abstract:In this paper, the linearization of the Gilbert downconverter mixer at the receiver is performed by two different methods that exploit the modified baseband signals. The signals for linearization in both methods are formed and processed in digital domain after demodulation. In the first method, the modified baseband signal is adjusted in amplitude and polarity and injected at the mixer. The linearization signals in the second method, which are also formed in the baseband and set on the appropriate amplitude and phase, modulate the fundamental carrier second harmonic and then lead to the mixer. The linearization effects of the linearization methods on the thirdand fifth-order intermodulation products are compared for the case when the signals for linearization are driven at the transistors' drain of the RF stage differential pair in the Gilbert cell. The influence of the linearization signals delay on the results is analysed as well.

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Section: Theoretical Analysismentioning

confidence: 99%

“…The influence of conductance terms g dx in (1) can be neglected based on the analysis carried out in (Aikio and Rahkonen, 2005;Heiskanen et al, 2003). As a result, the additional third-order nonlinear products are generated to reduce the original intermodulation products distorted by the transistor nonlinear characteristic.…”

Section: Theoretical Analysismentioning

confidence: 99%

Mixer Linearization by Modified Baseband Signals

Đorić¹,

Males-Ilic²,

Atanasković³

et al. 2016

Proceedings of the International Scientific Conference - Sinteza 2016

View full text Add to dashboard Cite

show abstract

“…Another option is to calculate the approximating polynomial through curve fitting [16,17]. Although this is the best choice when the polynomial expansion is calculated from experimental or simulation data, it need not be used when the analytical function of the nonlinearity is available.…”

Section: Chebyshev Series Performancementioning

confidence: 99%

“…The coefficients from the above expansion (17) can be used in the same Volterra analysis of the previous subsection. The coefficients of the C eff nonlinearity remain the same since it was modeled to be v DS independent.…”

Section: Large Signal Distortion Analysismentioning

confidence: 99%

Large and small signal distortion analysis using modified Volterra series

Sarkas

Mavridis

Papamichail

et al. 2007

Analog Integr Circ Sig Process

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A new approach to the Volterra analysis of analog circuits is presented. Volterra analysis is widely used for the calculation of harmonic and intermodulation distortion products. However, the analysis is limited to circuits experiencing small signal excitations and becomes inaccurate when the input signal amplitude increases, especially when MOS transistors are involved. In this paper, we analyze the cause of this drawback, which is no other than the Taylor series' convergence properties. Moreover, we propose a solution, by calculating the nonlinearity coefficients using a different type of polynomial expansion, the Chebyshev series. This replacement improves significantly the capabilities of Volterra analysis. We also present results comparing Chebyshev series with other types of polynomial expansions. Finally, we apply the proposed method to analyze the intermodulation distortion (IMD) of a CMOS RF power amplifier, both in the small and the large signal regimes.

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“…the large-signal admittances), and -using the well-known non-linear current method (Maas, 2003) -the response of the injected distortion currents is calculated in a given node. Superposition allows one to identify the effects of different non-linear current and charge sources, and also of different mixing mechanisms, like the mixing from the second harmonic to the fundamental band in the above example (Aikio and Rahkonen, 2005).…”

Section: Introductionmentioning

confidence: 99%

Analyzing distortion contributions in a complex device model

Rahkonen

Aikio

2014

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to propose a method to reduce the non-linear distortion of a transistor to its input and output ports to aid distortion contribution analysis (DCA). This is especially needed when the internal structure of a device model is complex. Design/methodology/approach -The non-linear distortion generated by all non-linear sources inside a device model are reduced to transistor i/o ports by LMSE fitting techniques. Simulations of an LDMOS power transistor are used to compare the reduced distortion results with the actual non-linear sources. Findings -It is shown, that device models where the current sources are split by intermediate nodes cause superficial results, when distortion contributions are calculated as a superposition of contributions from individual non-linear sources. The proposed iterative fitting technique works. Research limitations/implications -Some non-quasistatic effects and the transfer functions from external terminals to internal controlling nodes are not covered. Practical implications -The analysis is a step toward a generic non-linear distortion contribution simulation tool that would aid the designers to develop more linear analog circuits. Originality/value -The concept of DCA itself is fairly new. This paper makes a step to represent the distortion sources in a canonical way.

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Detailed distortion analysis technique based on simulated large-signal voltage and current spectra

Cited by 45 publications

References 17 publications

Mixer Linearization by Modified Baseband Signals

Mixer Linearization by Modified Baseband Signals

Large and small signal distortion analysis using modified Volterra series

Analyzing distortion contributions in a complex device model

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