Hittite HMC121G8 Datasheet
HMC121G8
MICROWAVE CORPORATION
GaAs MMIC SMT VOLTAGE-VARIABLE ATTENUATOR DC - 8 GHz
FEBRUARY 2001
2
ATTENUATORS
SMT
Features
WIDE BANDWIDTH: DC - 8 GHZ
LOW PHASE SHIFT VS. ATTENUATION
30 dB ATTENUATION RANGE
SIMPLIFIED VOLTAGE CONTROL
General Description
The HMC121G8 is an absorptive voltage
variable attenuator provided in a surfacemount hermetic package. It features an onchip reference attenuator for use with an
external op-amp to provide simple single
voltage attenuation control. The device is
ideal in designs where an analog control
signal must control RF signal levels over a
30 dB amplitude range, such as in AGC
circuits and in temperature compensation of
multiple gain stages. Applications include
military ECM and communications as well
as commercial microwave radios and VSAT.
Guaranteed Performance, 50 ohm system, -55 to +85 deg C
Parameter Min. Typ. Max. Units
Insertion Loss DC - 4 GHz: 1.5 3.0 dB
DC - 8 GHz: 2 3.5 dB
Attenuation Range 25 30 dB
Return Loss DC - 4 GHz: 10 15 dB
DC - 8 GHz: 7 10 dB
Switching Characteristics tRISE, tFALL ( 10/90% RF): 3 ns
tON, tOFF (50% CTL to 10/90% RF): 6 ns
Input Power for 0.25dB Comp. ( 0.5 - 8GHz) Min. Atten: +10 dBm
Atten. > 2dB: -2 dBm
Input Third Order Intercept (two - 8 dBm signals) Min. Atten: +2 5 dBm
Atten. > 2dB: +10 dBm
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
2 - 20
HMC121G8
MICROWAVE CORPORATION
HMC121G8 SMT VOL T AGE-VARIABLE ATTENU A TOR DC - 8 GHz
Insertion Loss Relative Attenuation
0
0
FEBRUARY 2001
-1
-2
-3
INSERTION LOSS (dB)
-4
-5
02 46810
FREQUENCY (GHz)
-10
-20
-30
ATTENUATION (dB)
-40
02 46810
FREQUENCY (GHz)
Return Loss Relative Attenuation vs.
Control Voltage
0
-10
-20
RETURN LOSS (dB)
-30
0246810
FREQUENCY (GHz)
0
-0.5
-1
V1
-1.5
-2
CONTROL VOLTAGE
-2.5
-3
0 5 10 15 20
RELATIVE ATTENUATION (dB)
V2
2
ATTENUATORS
SMT
30
25
Relative Phase
45
40
35
30
25
20
15
10
5
RELATIVE PHASE (DEG)
0
-5
0246810
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
18 dB
12 dB
FREQUENCY (GHz)
9 dB
3 dB
2 - 21
Loading...