CHM1080-98F Datasheet, PDF (13/16 Pages) United Monolithic Semiconductors – 71-86GHz Single Side Band Mixer

71-86GHz Single Side Band Mixer
Recommended assembly plan
To Vgg
10nF _120pF
mixer
GX
To Vdd LO _{10nF 120pF}
D
To Vgg LO _10nF ^120pF
G
160µm gap
LO
75µm
ribbon
CHM1080-98F
50Ω line
RF
Q
To
external
IF Hybrid
I
The design integrates a half ribbon (75µm wide) connection at the RF and LO input of the
MMIC amplifier compliant with a 50Ohm line on GaAs MMIC.
Circuits having to be as close as possible to each other, the ribbon length must be reduced to
the achievable minimum (160µm gap between two chips is considered) and the loop height
must also be the smallest realizable (80µm).
Ribbon(W75µm,length≈330µm )
Hyper
access
Hyper
access
MMIC
CHM1080
160µm
85µm
A second solution is the use of double wires (Ø 25µm). In this case, a minimum of two wires
and the same chip to chip distance than ribbon solution are necessary to reduce the
inductance effect. Nevertheless, simulations have demonstrated an improvement of RF
performance for E-band frequency range with the use of ribbon connection instead of wire.
Regarding the connection of the DC pads, a 25µm wedge bonding is preferred.
Ref. : DSCHM10803329 - 25 Nov 13
13/16
Specifications subject to change without notice
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