Preliminary GaAs PHEMT Switchable Gain LNA AL108-338 Features ■ For 3.2–3.8 GHz Fixed Wireless Applications ■ Adjustable Gain ■ +7 dBm Output Power ■ +17 dBm Output IP3 ■ 2.7 dB Noise Figure ■ Single +5 V Supply ■ Input and Output Matched to 50 Ω Description The AL108-338 is an LNA designed for use in 3.2–3.8 GHz WLAN applications. The leadless surface mount package houses a GaAs PHEMT MMIC that yields low noise, good 50 Ω match, high gain and powerful P1 dB performance. Powered by a single 5 V supply, it also offers a 10 dB gain adjustment range. Absolute Maximum Ratings Characteristic Value RF Input Power 20 dBm Bias Voltage 6 V Max. Storage Temperature -40 to +85°C Operating Temperature -65 to +150°C Electrical Specifications at 25°C (3.2–3.8 GHz) Control Voltage = 0 V, Bias Voltage = 5 V, ID = 85 mA Parameter Condition Frequency Gain Min. Typ. 19 21 dB 6 dBm 19 dBm Output P-1 dB Output IP3 PIN = -30 dBm 18 Noise Figure 2.5 Reverse Isolation 30 Max. 2.9 40 Unit dB dB Input VSWR 50 Ω System 1.5:1 2.0:1 Output VSWR 50 Ω System 1.5:1 2.0:1 Min. Typ. Max. 8 10 dB 6 dBm Control Voltage = 5 V, Bias Voltage = 5 V, ID = 85 mA Parameter Condition Frequency Gain Output P-1 dB Output IP3 PIN = -30 dBm 20 Noise Figure 23 9 Reverse Isolation 30 dBm 10 40 50 Ω System 1.5:1 2.0:1 Output VSWR 50 Ω System 1.5:1 2.0:1 Specifications subject to change without notice. 1/02A dB dB Input VSWR Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com Unit 1 GaAs PHEMT Switchable Gain LNA AL108-338 Typical Performance Data at 25°C 25 15 Gain (dB),POUT (dBm) Gain (dB),POUT (dBm) Gain (Low) 10 5 0 POUT (dBm) -5 -10 20 Gain (High) 15 10 POUT (dBm) 5 0 -15 -25 -20 -15 -10 -5 0 5 -25 10 -15 -10 -5 0 5 PIN (dBm) PIN (dBm) Gain and Output Power (Low Gain mode) Gain and Output Power (High Gain mode) 10 2.0 25 High Gain State 1.9 1.8 20 1.7 15 VSWR Gain (dB) -20 Low Gain State 10 Output (Low Gain) Input (Low Gain) 1.6 1.5 Output (High Gain) 1.4 1.3 1.2 5 1.1 Input (High Gain) 1.0 0 3.0 3.2 3.4 3.6 3.8 3.0 4.0 3.2 3.6 3.8 Frequency (GHz) Frequency (GHz) Gain vs. Frequency VSWR vs. Frequency Low Gain 0.850 10 Voltage Control 8 Bias Voltage 6 4 0.018 High Gain RF Input 2 0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 RF 0.850 Output 3.9 Frequency (GHz) Noise Figure vs. Frequency Dimensions in inches. 2 4.0 Evaluation Board 12 NF (dB) 3.4 Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 1/02A GaAs PHEMT Switchable Gain LNA AL108-338 Pin Out (Top View) Package Outline (Bottom View) 0.040 TYP. Bias Voltage Gain Control 13 16 12 13 14 N/C 15 1000 pF 16 N/C 1000 pF 1 0.026 TYP. N/C 1 12 N/C 0.157 2 RF Input RF Output 11 N/C 3 10 N/C N/C 4 9 N/C 0.013 TYP. 4 9 5 N/C 8 N/C 7 N/C 6 N/C 5 8 0.014 TYP. 0.157 Ground is connected to paddle on bottom. Truth Table Low Gain VC = 5 V High Gain VC = 0 V Typical S-Parameters (Control Voltage 0/+5 V) Low Gain State # GHZ S MA R 50 Freq. (GHz) S11 S11a High Gain State # GHZ S MA R 50 S21 S21a S12 S12a S22 S22a S11 S11a S21 S21a S12 S12a S22 S22a 1.0 0.0531 65.99 0.1093 132.60 0.0081 25.28 0.2937 -93.69 0.5023 11.44 0.2221 -171.21 0.0013 -19.22 0.2935 -93.51 1.5 0.1204 91.60 0.4417 0.0054 -24.99 0.2428 -84.55 0.3677 -60.06 2.2489 0.0055 91.43 2.0 0.1362 14.12 1.3032 -101.06 0.0042 -17.39 0.2899 -73.12 0.4475 -131.33 10.3201 -81.96 0.0066 97.84 0.346 -60.19 2.5 0.1651 -29.48 2.5615 153.17 0.0024 11.52 0.323 0.1954 -1.39 69.36 0.359 -88.94 3.0 0.1572 13.82 3.7729 53.89 35.81 0.3019 -83.48 70.40 0.2228 -80.36 4 4.0 0.4082 4.29 2.9632 -128.83 0.0055 -55.78 0.0637 17.93 0.2741 -14.00 10.2202 -144.57 0.006 4.5 0.5055 -4.96 1.9123 157.00 0.0063 -83.69 0.324 5.0 0.5351 -14.30 1.1534 92.88 0.0027 -148.15 0.3803 26.63 0.3458 -8.19 5.5 0.4906 -31.11 0.6649 35.33 0.0062 -179.25 0.4498 21.69 6.0 0.2427 -72.20 0.3686 -25.59 0.0079 138.81 2.26 0.0059 0.267 0.44 -74.12 36.24 18.28 65.05 13.8498 143.35 0.0036 0.1133 -15.23 13.6149 42.94 0.0062 0.2265 -86.97 -16.85 0.0713 12.81 5.7473 131.66 0.0009 -29.68 0.2643 34.37 2.7131 59.91 0.003 -119.30 0.3786 27.80 0.2818 -14.80 1.1847 0.28 0.0025 -177.50 0.4481 20.63 0.1318 34.49 0.4931 -55.56 0.0039 170.99 0.4398 18.02 -9.03 Measured S-Parameters represent the packaged device. Alpha Industries, Inc. [978] 241-7000 • Fax [978] 241-7906 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 1/02A 3