Synthesis of Leap-Frog Multiple-Loop Feedback OTA-C Filters

Sun, Yichuang

doi:10.1109/tcsii.2006.879095

Cited by 26 publications

(18 citation statements)

References 13 publications

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“…The equations in equation set 2 can be directly used to implement an active OTA-C filter in which the capacitors are all grounded [4]. However, V 1 requires an OTA with at least three inputs.…”

Section: B Ota-c Transformationmentioning

confidence: 99%

Wide Band Tunable Filter Design Implemented in CMOS

Anderson

Wilamowski

Dündar

2007

Intelligent Engineering Systems, 2007 International Conference On

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Abstract-Generation of filters using operational transconductance amplifiers and capacitors (OTA-C) has become more and more popular over recent years. A simple yet effective method of analytical synthesis is presented that makes use of ladder circuits, which are much more widely understood. Given the ladder circuit of a filter of any order, an equivalent OTA-C filter can be easily synthesized. The synthesis process is shown for both a low pass and a band pass filter. Higher order filters can easily be synthesized by extending the design process described. The design of the band pass filter is implemented in CMOS with a linearly tunable OTA to show the effect of non-ideal elements. The CMOS filter implementation is capable of linear center frequency tuning across three degrees of magnitude. Because of the wide band width tunability, this type of design lends itself to intelligent frequency scanning techniques. Such a system, to be used in military applications, is presented as an application of this filter design.

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Section: B Ota-c Transformationmentioning

confidence: 99%

Wide Band Tunable Filter Design Implemented in CMOS

Anderson

Wilamowski

Dündar

2007

Intelligent Engineering Systems, 2007 International Conference On

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Considering these advantages of CM circuits, several CM filters using different high-performance active building blocks such as CClIs [3][4][5][6][7], CCClIs [8][9][10][11][12],OT As [13][14][15][16]have been reported. Unfortunately, these reported circuits suffer from one or more of following weaknesses:…”

Section: Introductionmentioning

confidence: 99%

Cascadable current-mode multifunction filter configuration using minimum number of CCTAs and grounded capacitors

Zhou

Jiang

2011

2011 9th IEEE International Conference on ASIC

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A configuration is derived from signal flow graphs. A series of different order current-mode multifunction filters based on CCT As can be obtained from the configuration. All the derived filters can simultaneously realize five primary responses from same topology. Both (00 and Q can be tuned electronically independently over a wide range. Additionally, the configuration can be easily cascaded to obtain an nth order filter which is only composed by n CCT As and n grounded capacitors. The proposed configuration has simple structure, and is highly suitable for IC implementation. The realized circuits are simulated with SPICE to exhibit the performance.1.

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“…The leapfrog (LF) structure is one of the most popular choices in active-RC filter design due to its lower sensitivity than the cascade method [5]. LF operational transconductance amplifier and capacitor (OTA-C) filters have been derived by simulating passive RLC ladder prototypes and using a systematic MLF approach [12][13][14]. In [12], the synthesis of LF OTA-C filters for realizations of both transmission poles and zeros can be conducted using the general MLF approach.…”

Section: Introductionmentioning

confidence: 99%

“…This synthesis method, however, is based on matrix manipulation and requires knowledge of the general MLF theory. In [13], an alternative iterative approach for synthesis of LF MLF OTA-C filters based on coefficient matching is introduced. One hundred MHz CMOS G m − C seventh-order 0.05 • equiripple linear phase low-pass MLF filter based on the LF topology is given in [14].…”

Section: Introductionmentioning

confidence: 99%