Front-ene circuit of two-step double-orthogonal zero medium frequency structure receiver of global digital broadcasting |
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 |
Announcement Date: |
2006/06/28 |
Pub. Date: |
|
Publication Number: |
1794594 |
Announcement Number: |
|
Grant Date: |
|
Granted Pub. Date: |
|
ApplicationType: |
Invention |
State/Country: |
11[China|beijing] |
IPC: |
H04B 1/30, H03D 1/22 |
Applicant(s): |
Tsinghua Univ. |
Inventor(s): |
Sun Yaohui, Yang Huazhong |
Key Words: |
digital broadcast, two-step, double-orthogonal, zero medium frequency, receiver,front-ene circuit |
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 |
Claim: |
|
Priority: |
|
PCT: |
|
LegalStatus: |
|