Keysight 1GC1-4251
DC - 12 GHz HBT Series-Shunt Amplifier
Data Sheet
Features
–– High bandwidth, F−3dB:
12 GHz typical
–– Moderate gain:
9.5 dB ±1 dB @ 1.5 GHz
–– P−1dB @ 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 | 1GC1-4251 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 Heterojunction 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.
Absolute maximum ratings1
Symbol
Parameters/conditions
VCC
Min
Max
Units
VCC lead voltage
8.0
Volts
VPAD
Output lead voltage
3.5
Volts
Pin
RF input power, continuous
TJ
Junction temperature
Top
Operating temperature
−55
Tst
Storage temperature
−65
Tmax2
Max. assembly temperature
+7
dBm
+170
°C
+85
°C
+165
°C
+260
°C
1. Operation in excess of any one of these conditions 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
–– 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)
03 | Keysight | 1GC1-4251 DC - 12 GHz HBT Series-Shunt Amplifier - Data Sheet
DC specifications/physical properties1
(Typicals are for VCC = + 5V, Rout = 64 Ω)
Symbol
Parameters/conditions
Min
Typ
VCC
Supply voltage
4.75
6.0
14.5
17
20
mA
26
29
32
mA
IC1
Stage–one supply current (through Vcc lead)
IC2
Stage–two supply current (through output lead)
IC1 + IC2
Total supply current
Max
Units
Volts
46
mA
1. Backside ambient operating temperature TA = Top = 25 °C unless otherwise noted.
RF specifications
(TA = 25° C, VCC = + 5V, Rout = 64 Ω, 50 Ω system)
Symbol
Parameters/conditions
BW
Operating bandwidth (f−3db)
S21
Small signal gain (@ 1.5 GHz)
∆ Gain
Small signal gain flatness (DC - 12 GHz)
±1.5
dB
TC
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
dB
Minimum input return loss (10 - 12 GHz)
−12
dB
(RLout)MIN Minimum output return loss
−15
dB
Isolation
Reverse isolation
−15
dB
P−1dB
Output power at 1 dB gain compression (@ 1.5 GHz)
12
dBm
(RLin)MIN
Min
Typ
Max
12
8.5
9.5
Units
GHz
11
dB
P SAT
Saturated output power (@ 1.5 GHz)
13
dBm
NF
Noise figure
6.0
dB
04 | Keysight | 1GC1-4251 DC - 12 GHz HBT Series-Shunt Amplifier - Data Sheet
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 = 35.7 Vsupply – 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 1 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. 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.
The Keysight Technologies, Inc. document, GaAs MMIC ESD, Die Attach and Bonding
Guidelines, Application Note (5991-3484EN) provides basic information on these
subjects.
N/C3
Vcc
N/C3
12
11
10
N/C1,3
1
9
N/C2,3
RFIN
2
8
RFOUT
GND
3
7
N/C2,3
Pin 13
GND2
1GC1-4XXX
amplifier
4
5
6
N/C3
N/C3
N/C3
Top
view
1. Optional connection to RFIN for PCB trace wider than 16 mils. These package pins are not internally connected.
If not connected to RFIN, then the pin(s) should be connected to ground on the PCB.
2. Optional connection to RFOUT for PCB trace wider than 16 mills. 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 this must be connected to RF/DC ground. Use “filled” vias to prevent solder voids.
Figure 1. 1GC1-4251 simplified schematic diagram
05 | Keysight | 1GC1-4251 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 2.
Figure 2. 1GC1-4251 moisture sensitivity label
Tape and Reel
The 1GC1-4251 is available in tape and reel format to facilitate automatic pick
and place manufacturing. See Figure 6.
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 2011/65/EU, 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. Tape and reel label
06 | Keysight | 1GC1-4251 DC - 12 GHz HBT Series-Shunt Amplifier - Data Sheet
Orientation mark
2x2 Part number:
1GC1-4251
Pin 1
Mfg. DateCode:”YYWW”
YY = Year
WW= Work week
Figure 4. 1GC1-4251 package photo
0.90
±0.10
2.00 ±0.10
Pin 12
Pin 1
2.00 ±0.10
(0.40 typ)
Pin 12
(0.02 typ)
XXXX
YYWW
(0.17 typ)
1
2
Pin 1
(1.07)
(0.02 typ)
(10.30 typ)
(0.152 typ)
3
Topside label:
nnXX-nnXX = Keysight 4x4 part number
YYWW = Year - Work Week
1.07
(R
-0.00
0.15
-0.00
0.15
typ)
typ)
3 Permanently mark 4x4 part number without leading ‘1G’ and ‘42,’ and date code
(Example: ‘C145’ for 1GC1-4245 year, work week)
2 Side of lead is not plated (bare copper alloy) max burr 0.05 mm
1 Lead plating per assembly drawing
Notes: (Unless otherwise specified)
Notes:
- All dimensions ±0.08 mm (unless otherwise specified)
- Top-side orientation mark located • next to PIN 1.
- Backside and lead plating metallization is Sn-plated copper.
- Package top surface labeled with • last two digits of leading and trailing Keysight 4 x 4 part number (XXC1-XX51) and mfg date in Year (YY) and work week (WW) format
Figure 5. 1GC1-4251 dimensioned drawing
(3X R
07 | Keysight | 1GC1-4251 DC - 12 GHz HBT Series-Shunt Amplifier - Data Sheet
Device Orientation
Reel
Tape
User feed
direction
Cover tape
0.30
4.00 1
4.00
3 2.00 ±0.05
R
Ø1.50
+0.10
0
1.75 ±0.10
0.30
0.10
5.50 ±0.05 3
2.40
R 0.25
2.40
1.30
Section A-A
scale 10 X
Figure 6. 1GC1-4251 tape and reel configuration
A
12.00 ±0.30
Ø1.50 min
Notes: (Unless otherwise specified)
1 10 sprocket hole pitch cumulative tolerance ±0.2
2. Camber in compliance with EIA 481
3 Pocket position relative to sprocket hole measured
as true position of pocket, not pocket hole
08 | Keysight | 1GC1-4251 DC - 12 GHz HBT Series-Shunt Amplifier - Data Sheet
Supplemental Data
0
–10
–15
–20
S12
–10
–30
20
10
Frequency (GHz)
–10
–20
–20
S22
–30
–50
0.010
Figure 7. Typical S21 and S12 response1
10
Frequency (GHz)
Figure 8. Typical S11 and S22 response1
15
TA = 25 °C, VCC = +6 V,
Vsupply = +6V, ROUT = 100 Ω
0.5 GHz
4 GHz
8 GHz
10 GHz
12 GHz
Pout, (dBm)
10
5
0
-5
–15
–10
–5
0
Pin, (dBm)
Figure 17. Typical power responses1
1. Data measured on 1GC1-4251 mounted on thin-film in modular breadboard fixture.
–30
–40
–40
–25
0
0.0
S11
5
10
–50
20
S22, (dB)
10
S11, (dB)
S21, (dB)
0
–5
S21
5
TA = 25 °C, VCC = +6 V,
Vsupply = +6V, ROUT = 100 Ω
S12, (dB)
15
TA = 25 °C, VCC = +6 V,
Vsupply = +6V, ROUT = 100 Ω
09 | Keysight | 1GC1-4251 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 specifications. 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 Keysight at
MMIC_Helpline@keysight.com.
The product described in this data sheet is RoHS Compliant and RoHS
Process Compatible with a maximum temperature of 260 °C and a maximum
of 3 temperature cycles
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© Keysight Technologies, 2016
Published in USA, September 11, 2016
5992-1754EN
www.keysight.com