Active Comb Filter Using Operational Transconductance Amplifier

Abstract

A new approach for the design of an active comb filter is proposed to remove the selected frequencies of various signals. The proposed filter is based on only OTAs and capacitors, hence suitable for monolithic integrated circuit implementation. The workability of the circuit is tested using PSPICE for test signals of 60, 180, 300, and 420 Hz as in ECG signal. The results are given in the paper and found to agree well with theory.

Design method for VDCC-based analog comb filter for power line interference cancellation

“…Analog filters hold a distinct advantage for real-time signal processing compared to digital counterparts. Consequently, numerous analog comb filters have been listed in existing literature [3] , [4] , [5] , [6] , [7] , [8] , [9] to eliminate the primary frequency of PLI and its associated odd harmonics from biological signals like electrocardiogram (ECG), electroencephalogram (EEG), and electromyogram (EMG).…”

“…The key benefits of the suggested comb filter, which represents the novelty of the circuit by overcoming the literature research gaps, can be summarized as follows: Minimal Active Building Blocks: The proposed comb filter is notably efficient regarding active components, requiring only 4 VDCCs. Meanwhile, in [3] , [4] , [5] , [6] , [7] , [8] , more than four active building blocks are used. Reduced Passive Components: Besides its frugality with active components, the proposed filter employs fewer passive components than [3] , [4] , [5] , [6] , [7] , [8] .…”

Active Comb Filter Using Voltage Differencing Transconductance Amplifiers

“…The notch filter is taken from the published paper [8]. When a series of notch filters using VDTAs are cascaded; there is a drastic reduction in the number of active components as compared to reference [9] as it uses 10 OTAs while our design uses just 4 VDTAs.…”

Impact on Gain and Noise : ECG Amplifier & Comb Filter Design using OTA

“…In addition a current input is used to regulate the amplifier's g m . Hence, the circuits developed using OTAs are most likely to possess intrinsic electronic control of parameters such as the cutoff frequency, quality factor, gain of a filter, and the oscillatory conditions for an oscillator [28], [33], [34]. The designing of a systematic OTA-based filter, the following are observed: 1) determining the filter's specification and set up can be appropriate for the procuring of bio signals; and 2) determining the suitability of building cell to construct this filter with a chosen topology.…”