Image inhibiting filtering device capable of compensating LC network loss |
Title： |
| Image inhibiting filtering device capable of compensating LC network loss |
|
Application Number： |
200610112604 |
Application Date： |
2006/08/25 |
Announcement Date： |
2007/02/14 |
Pub. Date： |
|
Publication Number： |
1913375 |
Announcement Number： |
|
Grant Date： |
|
Granted Pub. Date： |
|
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H04B 1/26 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Chi Baoyong, Wang Zhihua |
Key Words： |
Image inhibiting filtering, compensating, LC network loss |
Abstract： |
This invention relates to image suppression of super-heterodyne receivers characterizing that said device is composed of a low noise amplifier, an image suppression filter and value Q automatic adjusting circuit on the chip serial orderly, in which, the adjusting circuit is composed of serially connected detect image suppression filter outputting an if oscillating envelope detector, a comparator and a digital signal processor providing digital signals of 9 bit digits to the digital controlled supply current source in the image suppression filter, the digital signal processor applies gradual approximation algorithm provides key digit control signals to the digital controlled current source to most probably compensate loss of LC network by the energy provided by the mutual-couple pair made up of two MOS diodes in the filter yet the image suppression filter will not oscillate. |
Claim： |
|
Priority： |
|
PCT： |
|
LegalStatus： |
|
Relevancy information
