A Radio Frequency (RF) receiver system consists of several components as shown in Table Q1(b). In this system, the antenna feeds 1×10³ W signal into a Low Noise Amplifier (LNA). Estimate the LNA gain in dB and ratio if the output signal of the Intermediate Frequency Amplifier (IFA) is 20 mW. (b) Table Q1 (b): Components in RF Receiver Stage Component Power Gain 1 Low Noise Amplifier (LNA) A Image Rejection Filter Mixer 2 -0.5 dB 3 -8 dB Intermediate Frequency Filter Intermediate Frequency Amplifier (IFA) 4 -0.5 dB 25 dB

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Filter

A filter is a device or process which removes some of the unwanted features or components like frequencies from a signal in signal processing. The feature of filters is the complete or partial suppression of some part of the signal, and filtering is a class of signal processing. This most often means removing some frequency bands or some frequencies. In the frequency domain, the filters do not exclusively act, especially in the image processing field many other targets for filtering exist. Without having to act in the frequency domain, the correlations can be removed for certain frequency components and not for others. The filters are widely used in electronics and telecommunication, in television, radio, radar, audio recording, music synthesis, control systems, computer graphics, and image processing.