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AN3394 Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza AN3394
Descripción Electrónicos  Antenna design and impedance matching guidelines for CR95HF multiprotocol contactless transceiver IC
PDF  29 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3394 Datasheet(HTML) 11 Page - STMicroelectronics

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AN3394
Description of DEMO-CR95HF-A and criteria for impedance matching
Doc ID 018754 Rev 5
11/29
capacitance C22 = (C3+ C17).Cinput,and RRX can be transformed in a parallel equivalent
circuit (see Figure 9: CR95HF parallel matching circuit intermediate simplification).
Figure 9.
CR95HF parallel matching circuit intermediate simplification
The resulting equivalent circuit allows to calculate the matching circuit composed of C11 and
C22 that satisfies the condition Zout= Zeq
* where Z
eq
* is the complex conjugate of Z
eq.
Figure 10.
CR95HF final equivalent circuit
The calculation described in Equation (A.I.7) and Equation (A.I.9) leads to:
Where
:
Equivalent circuit.
C
11
1
R
eq
ω
×
--------------------
R
eq
R
out
-----------
1
–
⎝⎠
⎛⎞
×
=
C
22
1
L
eq
ω
2
×
----------------------
C
11
–
C
input
p
–
–
=



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