EB2750QFN-AB FPM2750QFN 0.9GHz LNA EVALUATION BOARD FEATURES Measured @ 900MHz • 21 dBm Output Power • 19 dB Small Signal Gain • 0.6 dB Noise Figure • 31.5 dBm OIP3 measured @ Pout = 8dBm (per tone) ● Bias 3V, 50mA DESCRIPTION AND APPLICATIONS The data given above is based on measurements taken on the evaluation board described in this data sheet. This evaluation board is a balanced, dual biased, low noise amplifier. It is reactively matched at a frequency of 700 to 900 MHz. The active device is a Filtronic FPM2750QFN; a double-heterojunction, 750 μm gate periphery PHEMT. Biasing can be applied at the bias pins on the top and bottom of the board. A negative gate voltage is required for current limiting. Ground connection should be established prior to the gate and drain bias connections. This board is thin and flexible, so caution should be exercised when connecting it to coaxial cables. SCHEMATIC FPM2750QFN EVAL Board 0.01uF Schematic 33pF @ 0.9GHz -Vg Vd 0.01uF 33pF 20 Ohm 33pF RF IN 50 Ohm 1.0uF 100 nH 56 nH L1 C3 C2 50 Ohm L3 C1 33pF 33pF C4 L2 33pF L4 100 nH 33pF RF OUT 56 nH 33pF 20 Ohm 0.01uF 1.0uF 0.01uF -Vg Vd 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. EB2750QFN-AB FPM2750QFN 0.9GHz LNA EVALUATION BOARD BOARD LAYOUT 1.0uF 33pF P4 0.01uF 33pF L1 33pF L2 C3 33pF C4 33pF A2 R2 33pF 33pF 1.0uF 0.01uF 0.01uF P5 Ld L4 Q1 Lg C2 f 1SF xxxx A1 L3 C1 Lg 0.01uF 33pF R1 P3 Ld P1 P6 P2 The circuit used was designed using Roger 4350 material with a core thickness of 30 mils and 0.5oz copper cladding. The dielectric constant is 3.48 Recommended bias applied to the circuit is 3V, 50mA with a negative gate voltage for current limiting. 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. EB2750QFN-AB FPM2750QFN 0.9GHz LNA EVALUATION BOARD Measured Gain and Return Loss 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected].