Keysight Technologies
DC–12 GHz HBT Series–Shunt Amplifier
1GC1-4251
Data Sheet
Features
–– High bandwidth, F−3 dB:
12 GHz typical
–– Moderate gain:
9.5 dB ± 1 dB @ 1.5 GHz
–– P−1 dB @ 1.5 GHz:
12 dBm typical
–– Low l/f noise corner:
< 20 kHz typical
–– Single supply operation:
> 4.75 volts @ 44 mA typ.
–– Low power dissipation:
190 mW typ. for package
02 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
Description
The 1GC1-4251 is a packaged DC to 12 GHz, 9.5 dB gain, feedback amplifier designed to
be used as a cascadable gain block for a variety of applications. The device consists of a
modified Darlington feedback pair which reduces the sensitivity to process variations and
provides 50 ohm input/output port matches. Furthermore, this amplifier is fabricated
using HFTC’s Hetero-junction Bipolar Transistor (HBT) process which provides excellent
process uniformity, reliability and 1/f noise performance. The device requires a single
positive supply voltage and generally operates Class–A for good distortion performance.
–– Package type: Quad flat - No
Leads (SMT QFN)
–– Package dimensions: 2.0 x 2.0
mm (0.079 x 0.079 in)
–– Package thickness: 0.90 ± 0.10
mm (0.035 ± 0.0039 in)
–– Lead pitch: 0.40 mm (0.016 in)
–– Lead width: 0.20 mm (0.008 in)
Absolute maximum ratings1
Symbol
Parameters/conditions
Vcc
Max
Units
VCC lead voltage
8.0
Volts
VPAD
Output lead voltage
3.5
Volts
Pin
RF input power, continuous
+7
dBm
Tj
Junction temperature
+170
°C
Top
Operating temperature
−55
+85
°C
Storage temperature
−65
+165
Tst
Tmax
2
Min
Max. assembly temperature
+260
°C
1. Operation in excess of any one of these ratings may result in permanent damage to this device. For
normal operation, all combined bias and thermal conditions should be chosen such that the maximum
junction temperature (TJ) is not exceeded. TA = 25 °C except for Top, Tst, and Tmax.
2. Refer to JEDEC J-STD-020D for detailed reflow profile.
DC specifications/physical properties1
(Typicals are for VCC = + 5V, Rout = 64Ω)
Symbol
Parameters/conditions
Min
Typ.
Vcc
Supply voltage
4.75
6.0
IC1
Stage–one supply current (through Vcc lead)
14.5
17
20
mA
IC2
Stage–two supply current (through output lead)
26
29
32
mA
IC1 + IC2
Total supply current
46
1. Backside ambient operating temperature TA = Top = 25°C unless otherwise noted.
Max
Units
Volts
mA
03 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
RF specifications
(TA = 25 °C, VCC = + 5 V, Rout = 64Ω, 50Ω system)
Symbol
Parameters/conditions
BW
Operating bandwidth (f−3db)
S21
Small signal gain (@ 1.5 GHz)
Δ gain
Small signal gain flatness (DC − 12 GHz)
±1.5
Temperature coefficient of gain (DC − 10 GHz)
0.004
dB/ °C
Temperature coefficient of gain (10 − 12 GHz)
0.02
dB/ °C
Minimum input return loss (DC − 10 GHz)
−15
Minimum input return loss (10 − 12 GHz)
−12
dB/ °C
(RLout)MIN
Minimum output return loss
−15
dB
Insoloation
Reverse isolation
−15
dB
P-1 dB
Output power at 1 dB gain compression (@ 1.5 GHz)
12
dBm
PSAT
Saturated output power (@ 1.5 GHz)
13
dBm
NF
Noise figure
6.0
dB
TC
(RLin)MIN
Min
Typ.
Max
12
8.5
9.5
Applications
The 1GC1-4251 is a general purpose gain block that can be used for a variety of
applications requiring moderate amounts of gain and low power dissipation in a 50 ohm
system.
Biasing and operation
The 1GC1-4251 can be operated from a single positive supply. This supply must be
connected to two leads on the package, namely Vcc (lead 4) and the output (lead 6).
The supply voltage may be directly connected to the Vcc lead as long as the voltage is
between +4.75 to +7 volts; however, if the supply is higher than +7 volts, a series resistor
(Rcc) should be used to reduce the voltage to the Vcc lead. See the bonding diagram for
the equation used to select Rcc. In the case of the output lead, the supply voltage must
be connected to the output transmission line through a resistor and an inductor. The
required value of the resistor is given by the equation:
Rout = 35.7Vsupply –114.3 ohms,
where Vsupply is in volts. If Rout is greater than 300 ohms, the inductor may be omitted,
however, the amplifier’s gain will be reduced by ~0.5 dB. Figure 4 shows a recommended
assembly strategy.
The voltage at the IN and OUT leads of the package will be approximately 3.1 Volts;
therefore, DC blocking caps should be used at these ports.
Units
GHz
11
dB
dB
04 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
Assembly techniques
This package is compatible with wave–solder or reflow printed circuit board soldering
processes.
GaAs MMICs in either chip or SMT packages are ESD sensitive. ESD preventive measures
must be employed in all aspects of storage, handling, and assembly. MMIC ESD precautions, handling considerations, die attach and bonding methods are critical factors in
successful GaAs MMIC performance and reliability.
Keysight document, “GaAs MMIC ESD, Die Attach and Bonding Guidelines - Application
Note” (5991-3484EN) provides basic information on these subjects.
N/C3
Vcc
N/C3
N/C1,3
1, 3
N/C2,3
RFIN
RFOUT
1, 31,3
N/C
N/C2,3
Amplifier
2, 3
2, 3
Top view
N/C3
N/C3
N/C3
Figure 1. TC205P Simplified Schematic Diagram
Figure
1. Optional connection to RFIN for PCB tracer
wider1.than 16 mils. These package pins are not internally
TC205P
Simplified
connected. If not connected
to RFIN,
then theSchematic
pin(s) shouldDiagram
be connected to ground on the PCB.
2. Optional connection to RFOUT for PCB trace wider than 16 mils. These package pins are not internally
connected. If not connected to RFOUT, then the pin(s) should be connected to ground on the PCB.
3. N/C pins can be left open, but should be connected to RF/DC ground.
4. Pin 13 is the center heat slug that must be connected to RF/DC ground. Use “filled” vias to prevent
solder voids.
05 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
The 1GC1-4251 die is fabricated using a GaAs-based HBT semiconductor material
structure which is compatible with newer RoHS assembly temperatures and allows
the device to be attached to a hybrid microcircuit housing or to thermally conductive
embedded heatsinks which exist in QFN SMT packages.
Moisture compatibility
Injection mold components like the 1GC1-4251 in QFN are moisture-sensitive. The product is tested to the moisture and reflow sensitivity level 3 as per IPC/Jedec J-STD-020
and must be mounted within 24 hours of opening the shipping container. Store and
handle parts for reflow and for rework per IPC/Jedec J-STD-033B. An example of the
moisture sensitivity label is shown in Figure 3.
Tape and reel
The 1GC1-4251 is available in tape and reel format to facilitate automatic pick and place
manufacturing. See Figure 4.
RoHS compliance
The 1GC1-4251 amplifier is RoHS compliant. This means the component meets the
requirements of the European Parliament and the Council of the European Union
“Restriction of Hazardous Substances” Directive 2002/95/EC, commonly known as
“RoHS”. The six regulated substances are lead, mercury, cadmium, chromium VI (hexavalent), polybrominated biphenyls (PBB) and polybrominated biphenyl ethers (PBDE). RoHS
compliance implies that any residual concentration of these substances is below the
RoHS Directive’s maximum concentration values (MVC); being less than 1000 ppm by
weight for all substances except for cadmium which is less than 100 ppm by weight.
Figure 3. 1GC1-4251 moisture sensitivity label
Figure 2. Tape and reel label
06 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
Orientation mark
Pin 1
2x2 part number: 1GC1-4251
Mfg. date code: ‘YYWW’
YY = Year
WW= Work week
Figure 4. 1GC1-4251 package photo
XXXX
YYWW
Figure 5. 1GC1-4251 dimensioned drawing
1. Lead plating per assembly drawing
2. Side of lead is not plated (bare copper alloy), max burr 0.05 mm
3. Permanently mark 4x4 part number without leading “1G” and “42”, and date code (example, G145 for
1GC1-4245, year, work week)
4. Topside label: nnXX-nnXX = 4x4 part number, YYWW = Year - work week
5. All dimensions ± 0.08 mm (unless otherwise specified)
6. Top-side orientation mark located * next to PIN 1.
7. Backside and lead plating metallization is Sn-plated copper.
8. Package top surface labeled with • last two digits of leading and trailing Keysight 4 x 4 part number (XXC1XX51) and mfg date in year (YY) and work week (WW) format.
07 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
Reel
Tape
User
feed
direction
Cover
tape
Unless otherwise specified:
Section A-A
Scale 10X
10 sprocket hole pitch cumulative tolerance ±0.2.
1. Camber in compliance with EIA 481.
2. Pocket position relative to sprocket hole measured as true position of pocket, not pocket hole.
Figure 6. 1GC1-4251 tape and reel configuration
10
–10
S12 , (dB)
–10
–15
5
–20
S12
–25
0
0.0
10
Frequency (GHz)
Figure 7.
1
Figure 7.
Typical
response.
[1]
andand
S S12
Response
Typical
S S21
21
12
TA = 25 °C, VCC = +6V,
Vsupply= +6V, R OUT = 100Ω
–30
20
S11
–20
S22
–30
–40
–40
–50
0.010
15
–10
–20
–30
0
10
Frequency (GHz)
Figure 8.
1
Figure 8. Typical
S11S11
and
S22
and
S22Response
Response[1]
Typical
–50
20
Pout , (dBm)
0
–5
S 21
S 21, (dB)
0
S22, (dB)
TA = 25°C, VCC = +6V,
Vsupply= +6V, ROUT = 100Ω
S11, (dB)
15
TA = 25°C, VCC = +6V,
Vsupply = +6V, ROUT = 100Ω
0.5 GHz
4 GHz
8 GHz
10 GHz
12 GHz
10
5
0
-5
–15
–10
–5
0
5
10
Pin , (dBm)
Figure
9.
1
Figure 9. Typical Power
Responses
[1]
Typical Power Responses
1. Data measured on 1GC1-4251 mounted on thin–film in modular breadboard fixture.
2. This data sheet contains a variety of typical performance data. The information supplied should not be interpreted as a complete list of circuit specifications. In this data sheet the term typical refers to the 50th percentile performance.
08 | Keysight | DC–12 GHz HBT Series–Shunt Amplifier - Data Sheet
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This data sheet contains a variety of typical and guaranteed performance
data. The information supplied should not be interpreted as a complete list
of circuit specifi cations. Customers considering the use of this, or other
Keysight Technologies GaAs ICs, for their design should obtain the current
production specifications from Keysight. In this data sheet the term typical
refers to the 50th percentile performance. For additional information contact
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© Keysight Technologies, 2016
Published in USA, August 22, 2016
5992-1751EN
www.keysight.com