HMC1190LP6GE
v01.1112
BROADBAND HIGH IP3 DUAL CHANNEL DOWNCONVERTER
w/ Fractional-N PLL & VCO, 0.7 - 3.5 GHz
Figure 1. Interface to generate 3 V for LOVDD pin from 3.3V or 5V Supply.
VGATE Interface
The VGATE1, VGATE2 pins are bias pins for mixer cores. On evaluation board VGATE1, VGATE2 pin voltages are set
to 5V. However voltage can be tuned between 4.7V and 5V for optimizing input IP3 and conversion gain performances
for desired frequency band. Higher IIP3 values can be obtained by increasing the VGATE1, VGATE2 pin voltages but
this will reduce HMC1190LP6GE`s conversion gain. Figure 4 shows the measured conversion gain and IIP3 for four
values of VGATE1, VGATE2 pin voltages.
Conversion Gain vs. VGATE [1]
Input IP3 vs. VGATE
12
31
29
27
25
23
21
19
17
15
4.7 V
4.8 V
4.9 V
5 .0V
4.7 V
4.8 V
4.9 V
5.0 V
10
8
6
4
2
0
0.7
1.1
1.5
1.9
2.3
2.7
3.1
3.5
0.7
1.1
1.5
1.9
2.3
2.7
3.1
3.5
FREQUENCY (GHz)
FREQUENCY (GHz)
Figure 2. Conversion Gain & IIP3 vs. RF Frequency over VGATE Pin Voltage @25C, IF =150 MHz
After the VGATE voltage is tuned for optimized IIP3 and conversion gain performance, the VGATE pin voltage can
be generated from 5V supply voltage by changing the value of series resistors, R54 and R56 from 0 Ohm to an
appropriate value.
[1] Balun losses at IF output ports are de-embedded.
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Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
34
Application Support: Phone: 978-250-3343 or apps@hittite.com
HITTITE [ HITTITE MICROWAVE CORPORATION ]
