A Design of Bandpass Filter with High Image Rejection Ratio
Wang Hai-bi · Electronics & Packaging · 2014
The paper introduces a design of bandpass filter with high image rejection ratio. In the audio field, we contact mostly real filter, this filter have the characteristics of symmetry, which will bring the field of signal processing to a lot of trouble, such as the mirror frequency to produce AM, FM intermediate frequency filtering, will have a lot of interference to the channel search normal, this design uses the characteristics of complex filter, design a rejection bandpass filters with high image rejection ratio, it's used in digital tuning radio demodulation system, due to the use of the fully integrated bandpass filter, saves cost and space outside of the traditional intermediate frequency filter; inhibition ratio of 40 dB image rejection, greatly reduces the error operation channel search, improves the signal-to-noise ratio of the system, has certain reference meanings to the field of signal processing.