The problem of on-chip automatic tuning in continuous-time integrated filters

Schaumann, R.; Tan, M.A.

doi:10.1109/iscas.1989.100302

Cited by 68 publications

(31 citation statements)

References 9 publications

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“…터를 이용한 구조에서는 특정 주파수의 정현파 기 준 입력신호에 대한 주파수 응답 특성(magnitude or phase response)을 이용하여 필터 차단 주파수를 조 절 한다 [6][7][8] . [11,12] .…”

Section: 간접 주파수 제어의 또 다른 방식인 전압제어필unclassified

Integrated Filter Circuits Design for Mobile Communications

Lee¹

2013

The Journal of Korean Institute of Communications and Informati

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A new frequency tuning scheme and a transconductor with a wide tuning range and low harmonic distortion is presented. This frequency tuning technique is based on the relationship between the time-constant and the elapsed times in charging a capacitor up to a certain level. Its structure is as simple as that of a conventional tuning scheme using a VCF(Voltage-Controlled Filter) and it does not need a pure sine wave but uses a CLK(Clock) pulse as a reference signal, which is easily obtained from on-chip system clocks or external X-tal oscillators.When a certain reference CLK is given, without complex capacitor arrays the pole frequency of the filter can be controlled continuously in the frequency domain. Simulation results are presented to confirm the operation of the proposed approach.

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Section: 간접 주파수 제어의 또 다른 방식인 전압제어필unclassified

Integrated Filter Circuits Design for Mobile Communications

Lee¹

2013

The Journal of Korean Institute of Communications and Informati

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“…3. The difference between the desired gain and the actual gain is characterized by which can be expressed as (10) When the amplitude tuning loop settles to its steady state, i.e., when , the peak amplitude gain at the center frequency is tuned to the desired amplitude gain of . The steps to achieve are indicated in Fig.…”

Section: B Proposed Quality-factor Tuning Schemementioning

confidence: 99%

An Accurate Automatic Quality-Factor Tuning Scheme for Second-Order <emphasis emphasistype="italic">LC</emphasis> Filters

Bahmani

Serrano-Gotarredona

Sánchez-Sinencio

2007

IEEE Trans. Circuits Syst. I

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Abstract-This paper presents a scheme to accurately tune the quality factor of second-order LC bandpass filters. The information of the magnitude response at the center and one of the cutoff frequencies is used to tune both the amplitude and the quality factor of the filter using two independent yet interacting loops. Furthermore, the synergic interaction between the loops makes the proposed scheme stable and insensitive to the mismatch between the input amplitudes. A chip prototype was implemented in a 0.35-m CMOS process and consumes 4.3 mA from a single 1.3-V supply. Measurement results show that at 1.97 GHz the quality factor is tunable from 60 to 220 while the amplitude is tunable between 15 and 0 dBm with worst case quality factor and amplitude tuning accuracies of 10% and 7%, respectively.

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“…A final drawback conccrning gm-C filters is their dependence on the parameter gm which makes them highly susceptible ta process variations. This can be accounted for on-chip by including sorne form of automatic tuning [18,19].…”

Section: Transconductance-c (Gm-c) Filtersmentioning

confidence: 99%