CHM2378A Datasheet, PDF (6/8 Pages) United Monolithic Semiconductors – W-band Dual Channel Mixer

CHM2378a
Typical Assembly Configuration
+V
C1
R_bias
120pF
IF1
W-band Dual Channel Mixer
µ-strip line
L_lo
µ-strip line
L_rf1
µ-strip line
L_rf2
R_bias
C2
+V
120pF
IF2
This drawing shows an example of assembly configuration. The bias and IF inter-
connections are according to the example given in the previous chapter.
For the RF pads the equivalent wire bonding inductance (diameter=25µm) have
to be according to the following recommendation.
Port
LO (2)
RF1 (10)
RF2 (13)
Equivalent inductance
(nH)
L_lo= 0.26
L_rf1 = 0.26
L_rf2 = 0.26
Approximative wire
length (mm)
0.33
0.33
0.33
For a micro-strip configuration a hole in the substrate is recommended for chip
assembly.
As the connections at 77GHz (between MMIC and MMIC or between MMIC and
external substrate) are critical, the transition matching network is split into two
parts: one on MMIC and one on the external substrate. This choice allows to do
both kind of connections.
Ref. DSCHM23781269 -26-Sep.-01
6/8
Specifications subject to change without notice
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