Single stage LNA for GPS Using the MCH4009 Application Note http://onsemi.com Overview This application note explains about ON Semiconductor’s MCH4009 which is used as a Low Noise Amplifier (LNA) for GPS (Global Positioning System). The MCH4009 is a silicon bipolar transistor best suited for high-frequency applications which is assembled in the 4-pin surface mount package. For information about the performance, please refer to the datasheet of this product. Since the evaluation board is adjusted to achieve optimal performance in GPS (1575 MHz), the product can provide 14.1dB gain and 1.5dB noise figure. A standard material FR4 is used for the printed circuit board (PCB). Please note that the losses of the PCB and the SMA connector are not excluded from the noise figure. Semiconductor Components Industries, LLC, 2014 June, 2014 – Rev. 0 1/10 Single stage LNA for GPS Using the MCH4009 ■Summary of Data Ta = 25 °C, Input Power = -40 dBm Parameter DC Voltage DC Current Power Gain Noise Figure Input Return Loss Output Return Loss Isolation Gain 1dB Compression Input Power Input 3rd Order Intercept Point Symbol Condition Result Unit Vcc 3.0 V Icc 4.9 mA Gp f = 1575 MHz 14.1 dB NF f = 1575 MHz 1.5 dB RLin f = 1575 MHz 10.4 dB RLout f = 1575 MHz 8.4 dB ISL f = 1575 MHz 21.1 dB Pin1dB f = 1575 MHz -15 dBm IIP3 f1 = 1575 MHz f2 = 1576 MHz -0.5 dBm Pin = -26 dBm 2/10 Single stage LNA for GPS Using the MCH4009 ■Circuit Design Vcc = 3V C4 R1 C3 R2 L1 L2 OUTPUT INPUT C2 L3 C1 L4 TR1 Emitter Inductance W = 0.3 mm, L = 1.5 mm ■Evaluation Board 3/10 Single stage LNA for GPS Using the MCH4009 ■Bill of Materials Item Symbol Value Manufacturer Size Bip-Tr TR1 MCH4009 ON Semiconductor SC82 C1 C2 6 pF 100 pF Murata GRM155 Murata GRM155 1005 1005 C3 1000 pF Murata GRM155 1005 C4 1000 pF Murata GRM155 1005 R1 150 Ω Various 1005 Capacitor Resistor Inductor Material R2 22 kΩ Various 1005 L1 8.2 nH TDK MLG1005S 1005 L2 33 nH TDK MLG1005S 1005 L3 1 nH TDK MLG1005S 1005 L4 2.7 nH TDK MLG1005S 1005 - FR4 - 20 x 14 mm 4/10 Single stage LNA for GPS Using the MCH4009 ■Power Gain 30 Power Gain ‐ dB 25 20 15 10 5 0 500 1000 1500 Frequency ‐ MHz 2000 2500 1000 1500 Frequency ‐ MHz 2000 2500 ■Isolation 0 ‐5 Isolation ‐ dB ‐10 ‐15 ‐20 ‐25 ‐30 ‐35 ‐40 500 5/10 Single stage LNA for GPS Using the MCH4009 ■Input Return Loss Input Return Loss ‐ dB 0 ‐5 ‐10 ‐15 ‐20 500 1000 1500 Frequency ‐ MHz 2000 2500 1000 1500 Frequency ‐ MHz 2000 2500 ■Output Return Loss Output Return Loss ‐ dB 0 ‐5 ‐10 ‐15 ‐20 500 6/10 Single stage LNA for GPS Using the MCH4009 ■Noise Figure 4 Noise Figure ‐ dB 3.5 3 2.5 2 1.5 1 0.5 0 1450 1500 1550 1600 Frequency ‐ MHz 1650 1700 ■S11, S21, S12, S22 Wide Span 20 S21 S11,S21,S12,S22 ‐ dB 10 S22 0 ‐10 S11 ‐20 ‐30 ‐40 S12 ‐50 ‐60 ‐70 100 1000 Frequency ‐ MHz 10000 7/10 Single stage LNA for GPS Using the MCH4009 ■Smith Chart Input Return Loss S(3,3) 1575 MHz 1500 MHz toto1650 MHz freq (1.500GHz 1.650GHz) ■Smith Chart Output Return Loss S(4,4) 1575 MHz freq (1.500GHz 1.650GHz) 1500 MHz toto1650 MHz 8/10 Single stage LNA for GPS Using the MCH4009 ■Gain 1dB Compression Point 10 Output Power ‐ dBm 5 0 ‐5 ‐10 ‐15 ‐20 ‐25 ‐30 ‐45 ‐40 ‐35 ‐30 ‐25 ‐20 Input Power ‐ dBm ‐15 ‐10 ‐5 ■Input 3rd Order Intercept Point f1 =1575 MHz, f2 = 1576 MHz, Pin = -26 dBm 9/10 Single stage LNA for GPS Using the MCH4009 ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. 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