mga-31189 Avago Technologies, mga-31189 Datasheet - Page 7

• Manufacturer Part Number: mga-31189
• Description: 70 To 500 Mhz Ampliier For If Applications Using The Avago Technologies Mga-31189 Ampliier
• Manufacturer: Avago Technologies

Performance of the MGA-31189 at 70 MHz
With a device voltage of +5 V, the MGA-31189 demonstra-
tion board delivers a small signal gain of 21 dB, as shown
in Figure 13. Figure 12 shows the return loss curves for
the MGA-31189 when tuned for 70 MHz. The narrowband
matching approach allows the MGA-31189 to produce an
exceptionally good IRL of -20 dB and ORL of about -10.6
dB at 70 MHz. Figure 14 shows that the MGA-31189’s
reverse isolation is about -27.8 dB at 70 MHz. The NF for
the device was measured to be about 2.2 dB at 70 MHz. As
for linearity performance, the MGA-31189 produces 40.5
dBm of OIP3 and OP1dB at 70 MHz is about 23 dBm. Table
5 lists the MGA-31189’s performance at 70 MHz.
Figure 12. Input and output return loss
Figure 14. Reverse isolation
7
-10
-12
-14
-16
-18
-20
-22
-24
-25
-26
-27
-28
-29
-30
-31
-32
-6
-8
50
50
55
55
60
60
Frequency (MHz)
65
65
Frequency (MHz)
70
70
RED = Input Return Loss
BLUE = Output Return Loss
75
75
80
80
85
85
90
90
Table 5. MGA-31189 performance summary at 70 MHz
Figure 13. Small Signal Gain
Parameter
Frequency
Input Return Loss (IRL)
Small Signal Gain (SSGain)
Reverse Isolation (ISO)
Output Return Loss (ORL)
Noise Figure (NF)
Third-Order Intercept Point (OIP3)
1 dB Gain Compression Point (OP1dB) 23.0
22.0
21.5
21.0
20.5
20.0
19.5
19.0
50
55
60
65
Frequency (MHz)
70
75
Performance
70
-20.0
21.0
-27.8
-10.6
2.2
40.5
80
85
Unit
MHz
dB
dB
dB
dB
dB
dBm
dBm
90