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T5743 Datasheet(PDF) 6 Page - ATMEL Corporation |
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T5743 Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 41 page 6 T5743 4569A–RKE–12/02 Figure 5. Input Matching Network with SAW Filter Figure 6. Input Matching Network without SAW Filter 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. IN IN_GND OUT OUT_GND CASE_GND B3555 T5743 C3 22p L 25n C16 100p C17 8.2p L3 TOKO LL2012 F27NJ 27n C2 8.2p L2 TOKO LL2012 F33NJ 33n 1 2 3,4 7,8 5 6 8 9 RF IN f RF = 433.92 MHz LNAGND LNA_IN IN IN_GND OUT OUT_GND CASE_GND B3551 T5743 C3 47p L 25n C16 100p C17 22p L3 TOKO LL2012 F47NJ 47n C2 10p L2 TOKO LL2012 F82NJ 82n 1 2 3,4 7,8 5 6 8 9 RF IN f RF = 315 MHz LNAGND LNA_IN T5743 15p 25n 100p 3.3p TOKO LL2012 F22NJ 22n 8 9 RFIN f RF = 433.92 MHz LNAGND LNA_IN T5743 33p 25n 100p 3.3p TOKO LL2012 F39NJ 39n 8 9 RF IN f RF = 315 MHz LNAGND LNA_IN |
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