A high quality factor obtained by a second order band pass filter using CDTA

Electronics and communication engineering

Band Pass Filters are devices that pass a particular band and reject other frequencies. An example of an analogue electronic band-pass filter is an RLC circuit (a resistor–inductor–capacitor circuit). These filters can also be created by combining a low-pass filter with a high-pass filter.Bandpass is an adjective that describes a type of filter or filtering process; it is to be distinguished from passband, which refers to the actual portion of affected spectrum. Hence, one might say "A dual bandpass filter has two passbands." A bandpass signal is a signal containing a band of frequencies not adjacent to zero frequency, such as a signal that comes out of a bandpass filter. To obtain Band pass filters with high quality factors, various studies have been done, and various methods are adopted. CDTA (Current Differencing Transconductance Amplifiers) are the circuits which can be employed to make band pass filters at high frequencies to achieve high quality factors without involving extra parasitic. This paper presents a review of the method which are been adopted to make a band pass filter to achieve a high quality factor using CDTA’s. Using the proposed method this paper is based on providing high quality factor by employing a feedback circuit to a second order filter. The used second order filter is improved in such a way that we can obtain a high impedance output. Thus, it cancels a requirement of any extra active element to obtain filter outputs. The whole circuit is deeply studied to understand the influence of parasitics and non idealities. Various other references on design of band pass is studied with use of CDTA and the proposed circuit is favourable in improving quality factor to much better extent without having parasitic developed and any effect on stability of circuits.

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