6
Frequency (GHz)
-30
-20
-10
0
10
15 20 25 30 35
Return Loss (dB)
25C
-40C
85C
0
1
2
3
4
5
20 22 24 26 28 30 32
Frequency (GHz)
Noise Figure (dB)
25C
-40C
85C
Figure 13. Return Loss at LO over Temp
Figure 14. Noise Figure over Temp
Biasing and Operation
The AMMP-6532 is normally biased with a positive drain
supply connected to the VDD pin and a negative gate
voltage connected to the Vg pin through bypass ca-
pacitors as shown in Figure 17. The recommended drain
supply voltage is 3 V and gate bias voltage is -1V. The cor-
responding currents are 83mA and 0.1mA respectively.
The typical required LO level is +15dBm and it should
come from a low noise driver to ensure that overall Front
End NF is low.
The image rejection performance is dependent on the
selection of the IF quadrature hybrid. The performance
of the IF hybrid as well as the phase balance and VSWR
of the interface to the AMMP-6532 will aect the overall
front end performance. It should be noted that the
placement of the external IF Hybrid coupler should be as
symmetrical as possible in regard to the two IF outputs to
obtain optimal performance.
TOP VIEW
PACKAGE BASE: GND
IF1
NC
Vdd
Vg
LO
RF
NC
IF2
USB
IF
1-3.5GHz
LSB
RF
LSBUSB
LO
IF IF
Vdd
Vg
LO
+15dBm
1000pF
1000pF
Figure 15. Application of Receiver with IF Balun
The NF will be lowest when the IF hybrid’s phase and
magnitude imbalance are smallest since noise from
image signal is greatly rejected.
Theoretically, IF frequencies can be as low as DC.
However, when direct conversion is used (IF=DC), a
so-called phenomenon DC-oset could occur at the two
IF outputs. In most practical applications, IF should be
more than a few hundreds KHz to avoid DC-oset correc-
tion.
Refer the Absolute Maximum Ratings table for allowed
DC and thermal condition.
