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MICRF211 датащи(PDF) 9 Page - Micrel Semiconductor

номер детали MICRF211
подробное описание детали  3V, QwikRadio짰 433.92 MHz Receiver
PDF  18 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF211 датащи(HTML) 9 Page - Micrel Semiconductor

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Micrel
MICRF211
March 2007
9
M9999-030107
(408) 944-0800
Freq (MHz)
C3 (pF)
L2(nH)
Z device (
Ω)
390.0
1.5
47
22.5 – j198.5
418.0
1.5
43
21.4 – j186.1
433.92
1.5
39
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
Ω, then the matching components
are calculated by,
Equivalent parallel = B = 1/Z = 0.606 + j5.68 msiemens
Rp = 1 / Re (B);
Xp = 1 / Im (B)
Rp = 1.65k
Ω;
Xp = 176.2
Ω
Q = SQRT (Rp/50 + 1)
Q = 5.831
Xm = Rp / Q
Xm = 282.98
Ω
Resonance Method For L-shape Matching Network
Lc = Xp / (2×Pi×f);
Lp = Xm / (2×Pi×f)
L2 = (Lc×Lp) / (Lc + Lp);
C3 = 1 / (2×Pi×f×Xm)
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)
Ω @ 433.92MHz.(Figure 4).
Figure 4: device’s input impedance, Z = 18.6 – j174.2
Ω
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
Ω.
Figure 5. Plotting the Shunt Inductor and Series
Capacitor.



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