Dimtel LLRF4.6 매뉴얼 - 페이지 3
{카테고리_이름} Dimtel LLRF4.6에 대한 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Dimtel LLRF4.6 20 페이지.
페이지 인쇄IF filters
Many different IF filter designs have been developed for the original LLRF4. Most of
these should work well with LLRF4.6. Some have already been updated and tested on the
revised board — see the table below. CF is center frequency, BW is the bandwdith, level
refers to the bandwidth measurement level (drop in dB from the peak). For narrow filters,
3 dB measurement is appropriate, for wider ones, 1 and 0.5 dB bandwidth is specified. In
all cases, full bandwidth from lower to upper magnitude drop points is listed.
Tested on LLRF4.6
50 MHz (original)
39 MHz (Dimtel)
74 MHz (Dimtel)
81 MHz (Dimtel)
Wideband (J-PARC)
Tested on LLRF4.2
110 MHz (FERMI)
186 MHz (APEX)
DAC outputs are also filtered on the board, with a simple two element filter. Original
configuration is 150 nH series inductor followed by 100 pF parallel capacitor. This setup
has low-pass response with roughly 41 MHz 3 dB bandwidth. This two element design can
be reconfigured for wider bandwidth, high-pass response, or bypassed altogether.
CF (MHz)
BW (MHz)
48.5
9
39
5.5
74
11
81
12.4
34.1
68.1
110
58
190
28
3
Level (dB)
FS (dBm)
3
11
3
-4
3
-3
3
-3
0.5
6
3
-7
0.5
-5