User's Manual

UM-B-045
DA14580 Range extender v.2 reference application
Company confidential
User manual
Revision 1.1
14-September-2015
CFR0012-00 Rev 1
20 of 60
© 2015 Dialog Semiconductor
Low pass filter 4.4.3
The low pass filter is placed after the amplifier matching network in order to suppress the harmonics
generated due to the amplifier’s nonlinearity. The filter presents low losses in the 2.4 GHz to 2.5 GHz
frequency range (max. loss: 0.5 dB). The ripple on the pass band was chosen equal to 0.1dB.
Figure 11: Low pass filter
RFPA
ANT
2n7
1p2
2n7
Figure 12: T- shaped, 3-poles, Low Pass Filter
The filter is a T- type Chebyshev 3
rd
order low pass filter. The filter configuration is presented in
Figure 12.
Component value:
- 2,7nH : LQG15HN2N7S02 / Murata
- 1.2pF: GRM1555C1H1R2CZD1/ Murata
Frequency response measurements are presented in Figure 13 below.