Hittite HMC121 Datasheet
MICROWAVE CORPORATION
GaAs MMIC VOLTAGE-VARIABLE ATTENUATOR DC - 15 GHz
FEBRUARY 2001
HMC121
2
ATTENUATORS
DIE
Features
WIDE BANDWIDTH: DC - 15 GHZ
LOW PHASE SHIFT VS. ATTENUATION
30 dB ATTENUATION RANGE
SIMPLIFIED VOLTAGE CONTROL
General Description
The HMC121 chip is an absorptive voltage
variable attenuator. It features an on-chip
reference attenuator for use with an external
op-amp to provide simple single voltage
attenuation control. The device is ideal in
designs where analog control signal must
control RF signal levels over a 30 dB range,
such as AGC circuits and in temperature
compensation of multiple gain stages. Applications include military ECM and communications as well as commercial microwave radios and VSAT. See SMT packaged version HMC121G8 (hermetic).
Guaranteed Performance, 50 ohm system, -55 to +85 deg C
Parameter Min. Typ. Max. Units
Insertion Loss DC - 8 GHz: 1.8 2.8 dB
DC - 15 GHz: 2 3.5 dB
Attenuation Range 25 30 dB
Return Loss DC - 8 GHz: 13 18 dB
DC - 15 GHz: 10 15 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 - 15 GHz) Min. Atten: +10 dBm
Atten. > 2dB: -2 dBm
Input Third Order Intercept Min. Atten: +25 dBm
(two - 8 dBm signals 0.5 - 15 GHz) Atten. > 2dB: +10 dBm
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
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MICROWAVE CORPORATION
HMC121 VOLTAGE-VARIABLE ATTENUATOR DC - 15 GHz
Insertion Loss Relative Attenuation
0
0
HMC121
FEBRUARY 2001
-1
-2
-3
-4
INSERTION LOSS (dB)
-5
0 2 4 6 8 10 12 14 16
FREQUENCY (GHz)
-10
-20
-30
ATTENUATION (dB)
-40
0 2 4 6 8 10 12 14 16
FREQUENCY (GHz)
Return Loss Relative Attenuation vs.
Control Voltage
0
-10
-20
RETURN LOSS (dB)
-30
0 2 4 6 8 10 12 14 16
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
DIE
30
25
Relative Phase
90
70
50
30
RELATIVE PHASE (DEG)
10
-10
0246810121416
FREQUENCY (GHz)
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Web Site: www.hittite.com
20 dB
10 dB
1 dB and 3 dB
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