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AN3394 Datasheet(PDF) 9 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) 9 Page - STMicroelectronics

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AN3394
Description of DEMO-CR95HF-A and criteria for impedance matching
Doc ID 018754 Rev 5
9/29
1.5
Impedance matching circuit
1.5.1
Antenna circuit description
The impedance matching circuit is composed of a serial capacitance circuit (C2and C6) and
a parallel capacitance circuit (C3and C17).
Successive impedance transformation allows to simplify the antenna equivalent circuit and
to calculate C2, C6, C3 and C17 capacitances easily.
Figure 6.
Antenna circuit description
Where
R1,R5:
330
Ω. These resistors are used to limit the signal level on RX1-RX2. They must be
considered in the calculation of the impedance matching circuit.
Cinput:
22 pF. Cinput is the integrated capacitor between RX1-RX2. As R1,R5, it must be considered
for the impedance matching circuit.



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