DEMO-AMMP-6530 Datasheet, PDF (7/8 Pages) Broadcom Corporation. – 5–30 GHz Image Reject Mixer

25
Plo=10(dBm)
Plo=15(dBm)
20
15
10
5
0
5
10
15
20
25
30
Flo (dB)
Figure 19. Input 3rd Order Intercept Point. IF=1 GHz.
0
-5
-10
-15
-20
-25
-10
-5
0
5
10
15
20
LO POWER (dBm)
Figure 20. Conversion Gain vs. LO power. RF=21 GHz (-20 dBm), LO=20 GHz.
Biasing and Operation
The recommended DC bias condition for optimum
­performance, and reliability is Vg = -1 volts. There is no
current consumption for the gate biasing because the FET
mixer was designed for passive operation. For down con-
version, the AMMP‑6530 may be configured in a low loss
or high linearity application. In a low loss configuration,
the LO is applied through the drain (Pin8, power divider
side). In this configuration, the AMMP-6530 is a “drain
pumped mixer”. For higher linearity applications, the LO
is applied through the gate (Pin4, Lange coupler side).
In this configuration, the AMMP-6530 is a “gate pumped
mixer” (or Resistive mixer). The mixer is also suitable for
up-conversion applications under the gate pumped mixer
operation shown on page 3.
Please note that the image rejection and isolation
­performance is dependent on the selection of the low fre-
quency quadrature hybrid. The performance s­ pecification
of the low frequency quadrature hybrid as well as the
phase balance and VSWR of the interface to the AMMP-
6530 will affect the overall mixer performance.
NC
7
Vg
6
NC
5
8
drain
IF1
1
NC
2
IF2
3
gate
4
Figure 21. Simplified MMIC Schematic.
7