Design and Simulation of New Zero-IF Receiving Circuit

Peng Wang; Kun Liu; Min Quan Li

doi:10.4028/www.scientific.net/AMR.403-408.3123

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Design and Simulation of New Zero-IF Receiving Circuit
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 403-408Design and Simulation of New Zero-IF Receiving...

Design and Simulation of New Zero-IF Receiving Circuit

Abstract:

Compared to superheterodyne receiving circuits, the Zero-IF receiving circuits is featured by simple structure, integration accessibility to miniaturization and No image frequency interference, which saves the image frequency suppression filter with both high cost and low integration accessibility. The signal channel in Zero-IF receiving circuit can be set in low frequency and only a low-pass filter is thus needed. However, the native defects in Zero-IF receiving circuits, such as DC drift, LO leakage and LF Noise, lead to constant failures in achieving the Zero-IF. Therefore, by analysing these defects, two principal improvements are made in the design of a certain 915MHz mobile communication terminal receiving circuits, based on which the simulation design is completed and its feasibility and rationality have been theoretically verified through simulation softwares ADIsimRF and ADS.