PA 203 SMA

The Langer EMV PA 203 SMA is a compact, lightweight preamplifier covering 100 kHz to 3 GHz, designed specifically for amplifying weak measuring signals from near-field probes with high spatial resolution during PCB-level EMC diagnostic work. With 20 dB of gain and a noise figure of 4.5 dB, it lifts near-field signals from traces, ICs, and power planes above the noise floor of a connected spectrum analyzer or oscilloscope — allowing emission sources to be identified and characterized during the development stage before formal compliance testing.

Key specifications include a -1 dB output compression point of 0 dBm, a maximum input power of +13 dBm, and a 50 Ω SMA connector at both input and output. The near-field probe connects via cable to the amplifier input, with the amplifier output connected directly to the 50 Ω input of the measurement instrument. An SMA variant (PA 203 SMA) and a BNC variant (PA 203 BNC) are available — both sharing the same electrical specifications. Power is supplied via a 12 VDC plug at 50 mA current draw.

The PA 203 SMA is exceptionally compact at 50 × 38 × 13 mm and weighs just 35 g, making it unobtrusive in hands-on probe scanning setups where minimising the physical footprint around the DUT is important. It is available individually or as part of the PA 203 SMA set, which includes the preamplifier together with compatible Langer near-field probes and accessories for a complete PCB emission diagnostic workflow.