參數(shù)資料
型號： MICRF211
廠商： Micrel Semiconductor,Inc.
英文描述： 3V, QwikRadio㈢ 433.92 MHz Receiver
中文描述： 3V的，QwikRadio系列㈢為433.92 MHz接收器
文件頁數(shù)： 9/18頁
文件大?。?/td> 815K
代理商： MICRF211
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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