MGA-85563-BLKG Avago Technologies US Inc., MGA-85563-BLKG Datasheet - Page 10

• Manufacturer Part Number: MGA-85563-BLKG
• Description: AMP RFIC LNA GAAS 3V SOT-363
• Manufacturer: Avago Technologies US Inc.
• Type: General Purpose Amplifierr

Specifications of MGA-85563-BLKG

• P1db: 0.9dBm
• Noise Figure: 1.6dB
• Package / Case: SC-70-6, SC-88, SOT-363
• Current - Supply: 15mA ~ 20mA
• Frequency: 0Hz ~ 6GHz
• Gain: 18dB
• Rf Type: Cellular, PCS, WLAN
• Test Frequency: 2GHz
• Voltage - Supply: 2.7V ~ 3.6V
• Mounting Style: SMD/SMT
• Technology: Low Noise Amplifier
• Number Of Channels: 1
• Operating Frequency: 6000 MHz
• Operating Supply Voltage: 3 V
• Supply Current: 20 mA @ 3 V
• Manufacturer's Type: Low Noise Amplifier
• Frequency (max): 6GHz
• Operating Supply Voltage (typ): 3V
• Package Type: SOT-363
• Mounting: Surface Mount
• Pin Count: 6
• Noise Figure (typ): 1.6(Min)@6000MHzdB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-1957; MGA-85563-BLKG

Since the input terminal of the MGA-85563 is at ground
potential, the input DC blocking capacitor C1 need not
be used unless the amplifier is connected to a preceding
stage that has a voltage present at this point.
The value of the DC blocking and RF bypass capacitors
(C1 – C4) should be chosen to provide a small reactance
(typically <2 ohms) at the lowest operating frequency.
For this 1.9 GHz design example, 56 pF capacitors with
a reactance of 1.5 ohms are adequate. The reactance of
the RF choke (RFC) should be high (i.e., several hundred
ohms) at the lowest frequency of operation. A 22 nH in-
ductor with a reactance of 262 ohms at 1.9 GHz is suf-
ficiently high to minimize the loss from circuit loading.
The completed 1.9 GHz amplifier for this example with all
components and SMA connectors assembled is shown in
Figure 23.
Figure 23. Complete 1.9 GHz Amplifier Circuit.
Designs for Other Frequencies
The same basic design approach described above for 1.9
GHz can be applied to other frequency bands. Inductor
values for matching the input for low noise figure are
shown in Table 1.
For frequencies below 1000 MHz, the series input in-
ductor approach provides a good match but may not
completely noise match the MGA-85563. A two-element
matching circuit may be required at lower frequencies
to exactly match the input to *
the real part of *
Ω (i.e., away from the R = 1 circle on the Smith chart) as
the angle of *
cally 0.4 to 0.9 pF) added between the input pin and the
adjacent ground pad to create a shunt C-series L match-
ing network will realize an improvement in noise figure
of several tenths of a dB. A lower value for L1 may be
needed depending on the actual length of the input line
between Pin 1 and L1 as well as the value of the shunt C.
10
opt
MGA-85-A
IN
+V
decreases. A small shunt capacitor (typi-
R
opt
d
bias
has started to move away from 50
L1
MLIN
C4
85
RFC
opt
. At lower frequencies,
C3
C2
OUT
For frequencies above 3 GHz, the input is already well
matched to 50 Ω and no additional matching is normally
needed.
Table 1. Input Inductor Values for Various Operating Frequencies. (*Ad-
ditional matching required for optimum NF).
Actual component values may differ slightly from those
shown in Table 1 due to variations in circuit layout,
grounding, and component parasitics. A CAD program
such as Avago’s Touchstone® is recommended to fully
analyze and account for these circuit variables.
Frequency
(GHz)
0.8*
0.9*
1.5
1.9
2.4
5.1
5.8
(nH)
8.2
5.6
2.7
22
18
L1
0
0