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RF2460PCBA-41X Datasheet(PDF) 8 Page - RF Micro Devices

Part # RF2460PCBA-41X
Description  PCS CDMA LOW NOISE AMPLIFIER/MIXER 1500MHz TO 2200MHz DOWNCONVERTER
Download  26 Pages
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Manufacturer  RFMD [RF Micro Devices]
Direct Link  http://www.rfmd.com
Logo RFMD - RF Micro Devices

RF2460PCBA-41X Datasheet(HTML) 8 Page - RF Micro Devices

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RF2460
Rev B6 DS080128
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Output Interface Network of the Mixer
L1, C1, C2, and R form a current combiner which performs a differential to single-ended conversion at the IF frequency and
sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to the fol-
lowing equation:
Where CEQ is the equivalent stray capacitance and capacitance looking into pins 7 and 9. An average value to use for CEQ is
2.5pF.
R can then be used to set the output impedance according to the following equation:
where ROUT is the desired output impedance and RP is the parasitic equivalent parallel resistance of L1.
C2 should first be set to 0 and C1 should be chosen as high as possible (suggested less than 20pF), while maintaining an RP
of L1 that allows for the desired ROUT. If the self-resonant frequencies of the selected C1 produce unsatisfactory linearity per-
formance, their values may be reduced and compensated for by including C2 capacitor with a value chosen to maintain the
desired FIF frequency.
L2 and C3 serve dual purposes. L2 serves as an output bias choke, and C3 serves as a series DC block.
In addition, L2 and C3 may be chosen to form an impedance matching network if the input impedance of the IF filter is not
equal to ROUT. Otherwise, L2 is chosen to be large (suggested 120nH) and C3 is chosen to be large (suggested 22nF) if a DC
path to ground is present in the IF filter, or omitted if the filter is DC blocked.
f
IF
1
L1
2
------ C
1
2C
2
C
EQ
++
()
2
π
-----------------------------------------------------------
=
R
1
4 R
OUT
---------------------
1
R
P
------
⎝⎠
⎛⎞ 1
=


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