A linear integrated LC bandpass filter with Q-enhancement

Gao, Weinan; Snelgrove, W.M.

doi:10.1109/82.673647

Cited by 37 publications

(22 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Analysing this topology using Equations (2), (4), (6) and (8), the differential output current i diff i can be expressed as a function of the differential input voltage v diff as…”

Section: Basic Differential Pairmentioning

confidence: 99%

Obtaining maximally flat transconductances with any number of multiple coupled differential pairs

Carrasco-Robles¹,

Serrano²

2011

Circuit Theory & Apps

View full text Add to dashboard Cite

SUMMARYThis paper presents the solution to the mathematical problem of obtaining maximally flat transconductances with transconductors of multiple coupled asymmetric differential pairs. This problem has remained unresolved until now and this solution provides an extremely fast an easy way to obtain the transistor asymmetries and tail current factors. General expressions for the differential output current and the transconductance for any number of pairs are deduced. Likewise, the compatibility of this linearization technique with both source degeneration via diode connected transistors and the use of back-gate offset voltages is analysed. A designer's guide showing the way of modifying the theoretical parameters in order to be used in simulation is also proposed and finally, as a proof of concept, simulated results of several configurations with 10 coupled differential pairs are given.

show abstract

“…Analysing this topology using Equations (2), (4), (6) and (8), the differential output current i diff i can be expressed as a function of the differential input voltage v diff as…”

Section: Basic Differential Pairmentioning

confidence: 99%

Obtaining maximally flat transconductances with any number of multiple coupled differential pairs

Carrasco-Robles¹,

Serrano²

2011

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…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%