參數(shù)資料
型號： MICRF211AYQS
廠商： MICREL INC
元件分類： 消費(fèi)家電
英文描述： 3V, QwikRadio㈢ 433.92 MHz Receiver
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO16
封裝： QSOP-16
文件頁數(shù)： 9/18頁
文件大?。?/td> 815K
代理商： MICRF211AYQS
Micrel
MICRF211
March 2007
9
M9999-030107
(408) 944-0800
Freq (MHz)
390.0
418.0
433.92
C3 (pF)
1.5
1.5
1.5
L2(nH)
47
43
39
Z device (
)
22.5 – j198.5
21.4 – j186.1
18.6 – j174.2
Table 4: matching values for the most used frequencies
For the frequency of 433.92MHz, the input impedance
is Z = 18.6 – j174.2
, then the matching components
are calculated by,
Equivalent parallel = B = 1/Z = 0.606 + j5.68 msiemens
Rp = 1 / Re (B);
Rp = 1.65k
; Xp = 176.2
Q = SQRT (Rp/50 + 1)
Q = 5.831
Xm = Rp / Q
Xm = 282.98
Resonance Method For L-shape Matching Network
Lc = Xp / (2×Pi×f);
L2 = (Lc×Lp) / (Lc + Lp);
L2 = 39.8nH
C3 = 1.3pF
Doing the same calculation example with the Smith
Chart, it would appear as follows,
First, we plot the input impedance of the device,
(Z = 18.6 – j174.2)
@ 433.92MHz.(Figure 4).
Xp = 1 / Im (B)
Lp = Xm / (2×Pi×f)
C3 = 1 / (2×Pi×f×Xm)
Figure 4: device’s input impedance, Z = 18.6 – j174.2
Second, we plot the shunt inductor (39nH) and the
series capacitor (1.5pF) for the desired input
impedance (Figure 5). We can see the matching
leading to the center of the Smith Chart or close to
50
.
Figure 5. Plotting the Shunt Inductor and Series
Capacitor.
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MICRF211AYQS TR 功能描述:射頻接收器 380MHz to 450MHz, 3.0V to 3.6V, 6mA, 10kbps, ASK Receiver with RSSI and Shutdown in 16-Lead QSOP (Lead-Free) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel
MICRF213 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, QwikRadio㈢ 315MHz Receiver
MICRF213_11 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, QwikRadio 315MHz Receiver
MICRF213AYQS 功能描述:射頻接收器 300MHz to 350MHz, 3.0V to 3.6V, 7.2kbps, 4mA, ASK Receiver with RSSI, Shutdown in 16-Lead QSOP (Lead-Free) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel
MICRF213AYQS TR 功能描述:射頻接收器 300MHz to 350MHz, 3.0V to 3.6V, 7.2kbps, 4mA, ASK Receiver with RSSI, Shutdown in 16-Lead QSOP (Lead-Free) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel
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