A multi-step P-cell for LNA design automation

Cheng, Wei; Annema, Anne-Johan; Nauta, Bram

doi:10.1109/iscas.2008.4541976

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…On the other hand, equation-based methods [5][6][7] are faster, but are dependent on the accuracy of the models used. To overcome the disadvantages in some extent, advanced methods using both of equation-based and simulationbased approaches [8][9][10] have been also suggested.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Approach for Fast Automatic Sizing of Narrow-Band RF CMOS LNAs

Choi

2012

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We introduce a fast automatic sizing algorithm for a single-ended narrow-band CMOS cascode LNA adopting an inductive source degeneration based on an analytical approach without any optimization procedure. Analytical expressions for principle parameters are derived based on an ac equivalent circuit. Based on the analytical expressions and the power-constrained noise optimization criteria, the automatic sizing algorithm is developed. The algorithm is coded using Matlab, which is shown capable of providing a set of design variable values within seconds. One-time Spectre simulations assuming usage of a commercial 90 nm CMOS process are performed to confirm that the algorithm can provide the aimed first-cut design with a reasonable accuracy for the frequency ranging up to 5 GHz. This work shows one way how accurate automatic synthesis can be done in an analytical approach.

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Section: Introductionmentioning

confidence: 99%

An Analytical Approach for Fast Automatic Sizing of Narrow-Band RF CMOS LNAs

Choi

2012

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“…Therefore, for analyzing the nonlinear behavior of RF circuits, modeling and describing transistor nonlinearity is essential. Taylor series are successfully and dominantly used to describe the weakly nonlinear behavior of the MOS transistor [1][2][3][4][5]. However, most of these descriptions simplify the MOS nonlinearity model to the following extent:…”

Section: Mos Transistor Nonlinearity Modelingmentioning

confidence: 99%

“…4. The general LNA nonlinearity model is integrated in parametric cells (P-cells) [4] to provide distortion prediction.…”

Section: Benchmark On Accuracymentioning

confidence: 99%

“…One of the important design specifications of the LNA is its distortion performance, typically specified in terms of IIP2 and IIP3. A number of papers present nonlinearity analyses for LNAs to provide design guidelines [1][2] or for LNA design automation purposes [3][4]. Volterra series theory is widely used as the major nonlinearity analysis approach [5].…”

Section: Introductionmentioning

confidence: 99%

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A general weak nonlinearity model for LNAs

Cheng

Annema

Croon

et al. 2008

2008 IEEE Custom Integrated Circuits Conference

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Abstract-This paper presents a general weak nonlinearity model that can be used to model, analyze and describe the distortion behavior of various low noise amplifier topologies in both narrowband and wideband applications. Represented by compact closed-form expressions our model can be easily utilized by both circuit designers and LNA design automation algorithms. Simulations for three LNA topologies at different operating conditions show that the model describes IM components with an error lower than 0.1% and a one order of magnitude faster response time. The model also indicates that for narrowband IM2@w 1 -w 2 all the nonlinear capacitances can be neglected while for narrowband IM3 the nonlinear capacitances at the drain terminal can be neglected.

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“…To help RF designers reach these goals, automatic design procedures for some RF blocks have been proposed [1] [2]. Having a systematic design results in a general and fast solution which can be applied for different specifications and topologies.…”

Section: Introductionmentioning

confidence: 99%

LNA automatic synthesis and characterization for accurate RF system-level simulation

Haghighitalab¹,

Vasilevski²,

Aboushady³

2010

2010 53rd IEEE International Midwest Symposium on Circuits and Systems

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Abstract-In this paper, we propose an automatic design procedure for the synthesis of a cascode LNA with inductive source degeneration. The proposed method is based on the precise characterization of noise figure, input impedance and gain. The design procedure is implemented in a C++ environment using a BSIM3v3-based tool for transistor sizing and a symbolic computation tool for circuit characterization. SystemC AMS can then be used to perform a system level simulation of a complete RF receiver using precise model of the LNA. Considering the complete equivalent model for the transistors and the inductors, two LNAs operating at 2.4 GHz and 935 MHz are synthesized and characterized for a 130 nm CMOS process. The generated accurate model is then used in a high-level simulation of a complete QPSK-based RF receiver to study the effect of the LNA noise figure on the Bit Error Rate of the receiver.

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A multi-step P-cell for LNA design automation

Cited by 4 publications

References 8 publications

An Analytical Approach for Fast Automatic Sizing of Narrow-Band RF CMOS LNAs

An Analytical Approach for Fast Automatic Sizing of Narrow-Band RF CMOS LNAs

A general weak nonlinearity model for LNAs

LNA automatic synthesis and characterization for accurate RF system-level simulation

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