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| Two Operational Amplifiers Current Generalized Immittance (CGIC) Based Low-Pass Filter for BPSK Modem Implementation.
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Atsuwe, B.A.
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Abstract:
Modems in the beginning were needed mainly to communicate between data terminals and a host computer later, the use of modems was extended to communicate between end computers. Today, transmission involves data compression techniques which increase the rates, error detection and error correction for more reliability. The CGIC second order low pass filter is used in the receiver of the Binary phase shift keying (BPSK) modem for modulation of noisy signals generated in the transmitter because of its numerous advantages over other topologies in terms of stability, dynamic frequency range due to variable resistor that controls the centre frequency ?_o, etc. The filter designed has a centre frequency of 1.72kHz and a gain of 33dB its quality factor Q is 50. The circuit is designed to accommodate other modulation technologies since the ?_o and Q can be varied by tuning the filter. Therefore it is recommended that this filter be applied in other modulation techniques to ascertain its viability.
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