Title: Front-ene circuit of two-step double-orthogonal zero medium frequency structure receiver of global digital broadcasting
Application Number: 200510135479 Application Date: 2005.12.31
Publication Number: 1794594 Publication Date: 2006.06.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04B1/30,H03D1/22
Applicant(s) Name: Tsinghua Univ. Address: 100084
Inventor(s) Name: Sun Yaohui
Attorney & Agent:
Abstract:
     This invention relates to a global digital broadcast technology characterizing in applying two step double orthogonal zero IF including the following steps: transforming a RF signal to a high IF then to be switched to a base band directly via a double orthogonal mixed frequency structure. In practice, two different modes can be applied according to the different places set for the A/D converter by digitalizing after the first time of mixing the frequency then carrying out a second time orthogonal mixing and digitalization after that, which overcomes the shortcoming of converting frequencies for many times of the traditional superheterodyne receivers used at present in the global digital broadcast system
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