Active LC filters on silicon

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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“…The inductor with these parasitics can be modeled using the π-model [10]. The noise factor can be expressed as [11]:…”

Section: Nf Characterizationmentioning

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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“…Most common are differential implementations, where a negative conductance is created using positive feedback between two transistors, [1][2][3][4]. However, solutions where a single transistor is used together with reactive components have also been reported [2,5]. This paper presents a differential Q-enhanced LC resonator where the negative conductance is generated by a differential circuit using both transistors and reactive components.…”

Section: Introductionmentioning

confidence: 99%

“…Several implementations of Q-enhanced LC resonators have been reported in the literature [1][2][3][4][5]. Most common are differential implementations, where a negative conductance is created using positive feedback between two transistors, [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

An RF CMOS Q-Enhanced LC Resonator

Madseni

Mikkelsen

Lindof

et al. 2005

Analog Integr Circ Sig Process

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This paper investigates a Q-enhanced LC resonator implemented with a Q-enhancement circuit based on both active and reactive components. An analytical expression is presented for the Q-enhancement circuit and simulations are compared with measurements on a differential Q-enhanced LC tank operating at 1779-1870 MHz. Sensitive circuits and inaccurate models leads to inaccurate simulations. To improve the accuracy of simulations, S-parameter measurements of components and sub-circuits are included in the simulations whereby an accuracy of 3 MHz in the estimate of the resonator center frequency results.

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“…in receiver front-end circuits. Such filters are usually active LC filters [3], which can currently be implemented on silicon using on-chip spiral inductors [4,5], in the manner that employs a Q-enhancement technique [3,[6][7][8]. The currently available VHDL-AMS synthesis systems, such as VASE (VHDL-AMS Synthesis Environment) [10,11], and NEUSYS [12], are not directly suitable to high-level architectural synthesis of filters.…”

Section: Introductionmentioning

confidence: 99%