DESIGN APPLICATION NOTE -- AN-076 SGL-0363 GPS Application Circuit Abstract Circuit Details RFMD SGL-0363 is a high performance SiGe LNA designed for operation from DC to 6 GHz. This application note illustrates application circuits for GPS (Global Positioning System) frequency band (1575 MHz). RFMD will provide the detailed layout (AutoCad format) to users wishing to use the exact same layout and substrate material shown in the following circuits. The circuits recommended within this application note were designed using the following PCB material: Introduction The application circuits herein were designed to achieve the optimum combination of NF, input return loss, and stability. All recommended components are standard values available from well-known manufacturers. Components specified in the bill of materials (BOM) have known parasitics which in some cases are critical to the circuit’s performance. Deviating from the recommended BOM may result in a performance shift due to varying parasitics Matching component placement is critical to each circuit’s performance. Simplified Device Schematic Vpc RF Out Material: GETEK™ ML200C Core thickness: 0.031” Copper cladding: 0.5 oz both sides Dielectric constant: 4.1 (at 1 MHz) Dielectric loss tangent: 0.0089 (at 1 GHz) Customers not wishing to use the exact material and layouts shown in this application note can design their own PCB using the critical transmission line impedances and phase lengths shown in the BOMs and layouts. NOTE: Many of our sample evaluation boards may come with an additional substrate & copper layer for mechanical stability. It has been assumed that the backside layer has no effect on the RF performance or circuit design. GPS Matching Network Gnd Active Bias Network RF In GPS Matching Network Contact [email protected] for details. Gnd Performance Summary (Measured at 3.3V, 25C) Freq. (GHz) NF (dB) Gain (dB) IRL (dB) ORL (dB) S12 (dB) IIP3 1.54 1.43 17.2 -9.7 -21.2 -23.6 -1.7 1.55 1.43 17.1 -9.7 -23.3 -23.3 -1.7 1.56 1.44 17.1 -9.7 -23.9 -23.5 -1.6 1.57 1.46 17.1 -9.7 -24.9 -23.4 -1.6 1.58 1.47 17.0 -9.8 -25.5 -23.5 -1.6 1.59 1.49 17.0 -9.8 -25.4 -23.4 -1.6 1.6 1.50 16.9 -9.7 -24.9 -23.5 -1.6 OIP3 15.5 15.5 15.5 15.5 15.4 15.4 15.3 IM3 -61 -61 -61 -61 -61 -60 -60 P1dB 4.7 4.7 4.8 4.8 4.8 4.8 4.8 The information provided herein is believed to be reliable at press time. RFMD assumes no responsibility for i naccuracies or omissions. RFMD assumes no responsibility for the use of this information, and all such information shall be entirely at the user’s own risk. Prices and specifications are subj ect to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. RFMD does not authorize or warrant any RFMD product for use in life-support devices and/or systems. Copyright 2003 RFMD All worldwide rights reserved. 303 S. Technology Ct. Broomfield, CO 80021 Phone: (800) SMI-MMIC 1 http://www.RFMD.com EAN-104560 Rev A DESIGN APPLICATION NOTE -- AN-076 SGL-0363 GPS Application Circuits 1575 MHz Application Circuit Data Bill of Materials C1 C2 C3 C4 C5 L1 L2 L3 R1 R2 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x TAJB105KLRH Rohm 1.0uF MCH185C221JK Rohm 220pF MCH185A8R2DK Rohm 8.2pF MCH185A0R5CK Rohm 0.5pF MCH185A8R2DK Rohm 8.2pF LL1608-FS12NJ Toko 12nH LL1608-FS5N6S Toko 5.6nH LL1608-FS2N7S Toko 2.7nH 1.8Ω 0603 res (5%) 56Ω 0603 res (5%) Connectors 2x PSF-S01-1mm GigaLane Co. Heat sink EEF-102059 PCB 125390-B SGL-0363 1575 MHz Application Schematic Note: Electrical lengths are determined from the center of a shunt component and a cut on the center trace 56Ω 1.8Ω Ζ=50Ω, 4.7° Ζ=50Ω, 8.8° 303 S. Technology Ct. Broomfield, CO 80021 Ζ=50Ω, 7.6° Ζ=50Ω, 4.1° Ζ=50Ω,12.2° Ζ=50Ω, 5.1° Ζ=50Ω, 6.1° Phone: (800) SMI-MMIC 2 http://www.RFMD.com EAN-104560 Rev A DESIGN APPLICATION NOTE -- AN-076 SGL-0363 GPS Application Circuits Typical Performance - 1575 MHz Application Circuit (25°C) Input Return Loss over Voltage Gain over Voltage 24 -5 22 -10 20 S21(dB) S11(dB) 0 -15 S11_3.3V -20 S11_4.5V -25 -30 1.54 S11_5V 1.55 S21_5V 18 16 1.56 1.57 1.58 Frequency (GHz) 1.59 12 1.54 1.6 Isolation over Voltage 1.55 1.56 1.57 1.58 Frequency (GHz) 1.59 1.6 1.59 1.6 Output Return Loss over Voltage 0 -5 -5 S12_3.3V S12_4.5V -10 S22_3.3V S22_4.5V -10 S12_5V S22(dB) S12(dB) S21_4.5V 14 0 -15 -20 -25 -30 1.54 S21_3.3V S22_5V -15 -20 -25 1.55 1.56 1.57 1.58 Frequency (GHz) 1.59 1.6 -30 1.54 1.55 1.56 1.57 1.58 Frequency (GHz) Broadband Gain over Voltage 30 20 S21(dB) 10 3.3V 4.5V & 5V 0 -10 -20 -30 0 303 S. Technology Ct. Broomfield, CO 80021 1 2 3 4 Frequency (GHz) Phone: (800) SMI-MMIC 3 5 6 http://www.RFMD.com EAN-104560 Rev A DESIGN APPLICATION NOTE -- AN-076 SGL-0363 GPS Application Circuits Typical Performance - 1575 MHz Application Circuit (25°C) IM3 vs. Frequency -45 -50 3.3V 4V 4.5 5V 6 -55 IIP3 (dBm) IM3 (dBc) IIP3 vs. Frequency 8 -40 -60 -65 3.3V 4V 4.5V 5V 4 2 0 -70 -2 -75 -80 1.54 1.55 1.56 1.57 1.58 1.59 -4 1.54 1.6 1.55 Frequency (GHz) 18 16 4V 4.5V 5V 1.59 1.6 12 10 12 10 8 6 8 6 4 4 2 2 0 1.54 1.58 Ic vs. Vc 14 Ic (mA) P1dB (dBm) 14 3.3V 1.57 Frequency (GHz) P1dB vs. Frequency 20 1.56 1.55 1.56 1.57 1.58 1.59 0 1.6 3.3V Frequency (GHz) 4V 4.5V 5V Frequency (MHz) Noise Figure over Voltage NF (dB) 1.9 1.8 3.3V 4V 1.7 4.5V 5V 1.6 1.5 1.4 1.3 1.54 1.55 1.56 1.57 1.58 1.59 1.6 Frequency (GHz) 303 S. Technology Ct. Broomfield, CO 80021 Phone: (800) SMI-MMIC 4 http://www.RFMD.com EAN-104560 Rev A