T5743 Просмотр технического описания (PDF) - Atmel Corporation

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T5743

UHF ASK/FSK Receiver

Atmel Corporation 

Figure 5. Input Matching Network with SAW Filter

8 LNAGND

T5743

C3

L

9 LNA_IN

22p

25n

fRF = 433.92 MHz

C16

C17

100p

L3

27n

8.2p

TOKO LL2012

F27NJ

RFIN

L2

TOKO LL2012

F33NJ

1 IN

C2

33n

2 IN_GND

B3555

5

OUT

OUT_GND 6

CASE_GND

8.2p

3,4 7,8

Figure 6. Input Matching Network without SAW Filter

fRF = 433.92 MHz

15p

25n

8 LNAGND

T5743

9

LNA_IN

8 LNAGND

T5743

C3

L

9

LNA_IN

47p

25n

fRF = 315 MHz

C16

C17

100p

L3

47n

22p

TOKO LL2012

F47NJ

L2

RFIN

TOKO LL2012

F82NJ

1 IN

B3551

5

OUT

C2

82n

2 IN_GND

OUT_GND 6

CASE_GND

10p

3,4 7,8

fRF = 315 MHz

33p

25n

8 LNAGND

T5743

9 LNA_IN

RFIN

3.3p

22n

100p

TOKO LL2012

F22NJ

RFIN

3.3p

39n

100p

TOKO LL2012

F39NJ

Please notify that for all coupling conditions (see Figure 5 and Figure 6), the bond wire

inductivity of the LNA ground is compensated. C3 forms a series resonance circuit

together with the bond wire. L = 25 nH is a feed inductor to establish a DC path. Its

value is not critical but must be large enough not to detune the series resonance circuit.

For cost reduction this inductor can be easily printed on the PCB. This configuration

improves the sensitivity of the receiver by about 1 dB to 2 dB.

6 T5743

4569A–RKE–12/02

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