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부품번호 | B3574 기능 |
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기능 | SAW Components Low-loss Filter | ||
제조업체 | EPCOS | ||
로고 | |||
전체 6 페이지수
SAW Components
Preliminary Data B3574 (LD25A)
SAW Components
Low Loss Filter
Preliminary Data
B3574 (LD25A)
868,30 MHz
Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit)
Ls1 = 18 nH
Lp2 = 39 nH
Lp3 = 39 nH
Ls4 = 18 nH
Lk = 12 nH
Minimising the crosstalk
For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with
a good RF layout. The major crosstalk mechanism is caused by the “ground-loop” problem.
Grounding loops are created if input-and output transducer GND are connected on the top-side
of the PCB and fed to the system grounding plane by a common via hole. To avoid the common
ground path, the ground pin of the input- and output transducer are fed to the system ground
plane (bottom PCB plane) by their own via hole. The transducers’ grounding pins should be
isolated from the upper grounding plane.
A common GND inductivity of 0.5nH degrades the ultimate rejection (crosstalk) by 20dB.
The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown
here. In this PCB layout the grounding loops are minimised to realise good ultimate rejection.
Optimised PCB layout for SAW filters in QCC8C package, pinning 1,5 (top side, scale 1:1)
The bottom side is a copper plane (system ground area). The input and output grounding pins
are isolated and connected to the common ground by separated via holes.
For good contact of the upper grounding area with the lower side it is necessary to place
enough via holes.
4 May 09, 2001
4페이지 | |||
구 성 | 총 6 페이지수 | ||
다운로드 | [ B3574.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
B3570 | SAW Components Low-loss Filter | EPCOS |
B3571 | SAW Components Low-loss Filter | EPCOS |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |