Spaceborne S-Band Solid State Power Amplifier

This product has been discontinued

General Dynamics' space-qualified, S-Band Solid State Power Amplifier (SSPA) offers highly efficient and reliable power amplification and features an internal DC-DC power converter and voltage regulator. As a certified CMMI Level-3 provider, General Dynamics designs and manufactures high reliability space electronics designed to support any space mission. Our currently deployed 8W SSPA systems perform flawlessly in support of programs, including the Lunar Reconnaissance Orbiter (LRO), Global Precipitation Measurement (GPM), Landsat Data Continuity Mission (LDCM) and Communications, Navigation and Networking Re-Configurable testbed (CoNNeCT).

  • High efficiency
  • High reliability
  • Small size
  • Low mass


The General Dynamics Radio Frequency (RF) amplifier design represents the culmination of a 50-year heritage of trusted space flight performance. This design offers lower risk and development time, improving time to mission and reducing overall lifecycle cost. This system features a DC-DC power converter and regulator designed to the unique specifications of the S-Band Solid State Power Amplifier (SSPA). Our SSPA provides analog telemetry signals operating in compression, maximizing efficiency for constant envelope modulation. The system also uses an Automatic Level Control (ALC) to maintain RF output power over temperature. Operating over the 2.2 to 2.3 GHz frequency range, the SSPA serves as a companion unit to General Dynamics' Multi-Mode Standard Transponder (MST) or operates as a stand-alone power amplifier. Gallium arsenide (GaAs) power Monolithic Microwave Integrated Circuit (MMIC) technology improves the system’s size, weight and power (SWAP) ratio, providing high efficiency, high reliability, small size, and low mass.

  • 8.3 watts typical output power
  • 2.2 - 2.3 GHz frequency range
  • Built-in DC-DC converter and regulators
  • 22 - 36v input voltage
  • High power-added efficiency (27%)
  • Fully space qualified and radiation tolerant
  • Electromagnetic compatibility (EMC) performance qualified to MIL-STD-461C
  • Output power telemetry (TLM) (optional)
  • System power toggle (optional)
  • Current limiting (optional)



S-Band Solid State Power Amplifier

Data Sheet



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Radio Frequency (RF) Output Power: > 7 Watts (8.3 Watts typical)
Output Power Variation: ± 0.25 dB over any 50 MHz band
Input Power: + 8 ± 3 dBm or + 11 ± 3 dBm (selected at manufacture)
Input/Output Impedance: 50 ohms
lnput/VSWR: 1.5:1 maximum/output VSWR: 1.22:1 maximum
Source/Load VSWR: 1.5:1 maximum
Output Protection: No damage, any VSWR, any phase
Spurious Outputs: < 60 dBc
Harmonic Outputs: < 30 dBc
RF Breakdown Margin: > 6 dB @ VSWR of < 10:1, any phase
User Interface RF Input: SMA
RF Output: SMA
DC Power/TLM: 15-Socket Sub-D On/off Command: NDL-Triax
(7mA current loop)
Input Power Operating Voltage: 22 to 36 VDC
Over/Under Voltage: 0 to +22, +36 to + 40 Vdc, no damage
Power: 37 Watts max (31 Watts nominal)
Isolation to Chassis: 1 to 100 megohms
Inrush Current Limiter
General Maximum Dimensions: 6.85” L x 7.3” W x 1.4” H, including mounting feet
Mass: 4.35 lbs. (1.98 kg)
Flight Temperature: -34°C to +66°C
Vibration: 25 Grms
Pyrotechnic Shock: 2500 G
Altitude: Sea level to vacuum
Radiation : to 100 krads (Si)


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