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參數(shù)資料
| 型號(hào)： | ZXF103 |
| 廠商： | Zetex Semiconductor |
| 英文描述： | VARIABLE Q FILTER |
| 中文描述： | 變量Q濾波器 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 302K |
| 代理商： | ZXF103 |
Designing for a value of Q
As mentioned on the configuration pages, there is a
proportional relationship between the ratio of R4 and R3,
and Q.
Q
R4
R3
∝
These resistors define the gain of an inverting amplifier
that determines the peak value of gain and therefore the
Q of the filter, as Q is described as;
Q
=
Fo
3dBBandwidth
This value of required gain is quite critical. As the
maximum value of Q is approached, too much gain will
cause the filter to oscillate at the centre frequency Fo. A
small reduction of gain will cause the value of Q to fall
significantly. Therefore, for high values of Q factor or
tight tolerances of lower values of Q, the resistor ratio
must be trimmed.
Frequency dependant effects must be accounted for in
determining the appropriate gain. As the frequency
increases, the effective circuit gain reduces. The required
gain is nominally two but at higher frequencies it will
need to be slightly greater than two in order to
compensate for loss of gain and internal phase shifts.
This is not really a problem for circuits where the desired
Fo remains constant, as the phase shifts are accounted
for permanently. For designs where Q is high and Fo is
to be ‘swept’, care must be taken that a gain appropriate
at the highest frequency does not cause oscillation at the
lowest.
Variation in Q increases from device to device, as the
value of Q increases, due to internal gain spreads.
ZXF103
ISSUE 1 - APRIL 2002
6
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| ZXF103Q16 | Circular Connector; No. of Contacts:32; Series:; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:18; Circular Contact Gender:Socket; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:18-32 RoHS Compliant: No |
| ZXF103Q16TA | VARIABLE Q FILTER |
| ZXF103Q16TC | VARIABLE Q FILTER |
| ZXF36L01 | VARIABLE Q FILTER |
| ZXF36L01EVB | ZXF36L01 EVALUATION BOARD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZXF103EV | 功能描述:BOARD EVALUATION FOR Q FILTER RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、纜線(xiàn)、軟件、數(shù)據(jù)表和用戶(hù)手冊(cè) 其它名稱(chēng):520-1035 |
| ZXF103Q16 | 制造商:ZETEX 制造商全稱(chēng):ZETEX 功能描述:VARIABLE Q FILTER |
| ZXF103Q16TA | 功能描述:信號(hào)調(diào)節(jié) Variable Q Filter RoHS:否 制造商:EPCOS 產(chǎn)品:Duplexers 頻率:782 MHz, 751 MHz 頻率范圍: 電壓額定值: 帶寬: 阻抗:50 Ohms 端接類(lèi)型:SMD/SMT 封裝 / 箱體:2.5 mm x 2 mm 工作溫度范圍:- 30 C to + 85 C 封裝:Reel |
| ZXF103Q16TC | 功能描述:IC FILTER HI-FREQ VAR Q QSOP-16 RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類(lèi)型:連續(xù)時(shí)間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| ZXF36L01 | 制造商:ZETEX 制造商全稱(chēng):ZETEX 功能描述:VARIABLE Q FILTER |
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