High IP3 Low-Noise Amplifier

Transcription

1 EVALUATION KIT AVAILABLE General Description The low-cost, high third-order intercept point (IP3) low-noise amplifier (LNA) is designed for applications in 2.4GHz WLAN, ISM, and Bluetooth radio systems. It features a programmable bias, allowing the input IP3 and supply current to be optimized for specific applications. The LNA provides up to +1dBm input IP3 while maintaining a low noise figure of 2.dB and a typical gain of 16dB. The is designed on a low-noise, advanced silicon-germanium (SiGe) technology. It operates with a +2.7V to +5.5V single supply and is available in an ultrasmall 6-pin SC7 package. Applications Bluetooth WLAN Home RF Satellite CD Radio 2.4GHz ISM Band Radios 2.4GHz Cordless Phones Wireless Local Loop (WLL) Features Low Noise Figure (2.dB at 245MHz) High Gain: 16dB Adjustable IP3 and Bias Current Low-Power Standby Mode On-Chip Output Matching +2.7V to +5.5V Single-Supply Operation Ultra-Small 6-Pin SC7 Package Ordering Information PART TEMP RANGE PIN- PACKAGE TOP MARK EXT+ -4 C to +85 C 6 SC7 AAG EXT-T -4 C to +85 C 6 SC7 AAG EXT+T -4 C to +85 C 6 SC7 AAG Typical Operating Circuit Pin Configuration R 1.2kΩ TOP VIEW RF INPUT L1 3.3nH C1 RF OUTPUT SC ; Rev 2; 2/17

2 Absolute Maximum Ratings to...-.3v to +6V, to...±.3v Power (5Ω source)...+5dbm to... to +.3V Operating Temperature Range C to +85 C Maximum Junction Temperature C Continuous Power Dissipation (T A = +7 C) 6-Pin SC7 (derate 3.1mW/ C above +7 C)...245mW Storage Temperature C to +15 C Lead Temperature (soldering, 1s)...+3 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC Electrical Characteristics ( = +2.7V to +5.5V,, no RF signal applied, R FIN and R FOUT are AC-coupled and terminated to 5Ω, to +85 C. Typical values are at = +3.V, T A = +25 C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage V Operating Supply Current R = 3.9kΩ 2.7, , to +85 C 11. R = 75Ω 1.2 Standby Supply Current R is unconnected,, = 3.3V 1 µa ma AC ELECTRICAL CHARACTERISTICS ( EV kit, = +3.V, f = 245MHz, P = -3dBm, input and output are terminated to 5Ω,,, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Operating Frequency (Note 3) MHz Gain (Note 4) db Gain Variation Over Temperature to +85 C ±.7 ±1. db R = 75Ω -4 Input Third-Order Intercept Point (Note 5) -3 dbm R = 3.9kΩ -8 Input 1dB Compression Point -13 dbm Noise Figure (Note 6) db Input Return Loss -15 db Output Return Loss -1 db Reverse Isolation -3 db Note 1: Devices are production tested at. Minimum and maximum values are guaranteed by design and characterization over temperature and supply voltages. Note 2: Min/Max limits are guaranteed by design and characterization. Note 3: The part has been characterized at the specified frequency range. Operation outside this range is possible but not guaranteed. Note 4: Excluding PC board losses (.3dB at the input and.3db at the output of the EV kit). Note 5: Measured with two input tones (f 1 = 2445MHz, f 2 = 2455MHz) both at -3dBm per tone. Input IP3 can be improved to +1dBm with circuit shown in Figure 2. Note 6: Excluding PC board losses (.3dB typical at the input of the EV kit). Maxim Integrated 2

3 Typical Operating Characteristics (P = -3dBm, Z S = Z L = 5Ω, = +3.V, f = 245MHz,,, unless otherwise noted.) SUPPLY CURRENT (ma) SUPPLY CURRENT vs. SUPPLY VOLTAGE toc1 SUPPLY CURRENT (ma) SUPPLY CURRENT vs. R toc2 GAIN (db) GAIN vs. SUPPLY VOLTAGE toc SUPPLY VOLTAGE (V) R (kω) SUPPLY VOLTAGE (V) GAIN (db) GAIN vs. FREQUENCY toc4 GAIN (db) GAIN vs. R toc5 REVERSE ISOLATION (db) INPUT AND OUTPUT RETURN LOSS vs. FREQUENCY OUTPUT RETURN LOSS INPUT RETURN LOSS toc FREQUENCY R (kω) FREQUENCY REVERSE ISOLATION (db) REVERSE ISOLATION vs. FREQUENCY toc7 NOSIE FIGURE (db) NOISE FIGURE vs. FREQUENCY toc8 NOSIE FIGURE (db) NOISE FIGURE vs. TEMPERATURE toc FREQUENCY FREQUENCY TEMPERATURE ( C) Maxim Integrated 3

4 Typical Operating Characteristics (continued) (P = -3dBm, Z S = Z L = 5Ω, = +3.V, f = 245MHz,,, unless otherwise noted.) OUTPUT POWER (dbm) OUTPUT POWER vs. INPUT POWER R = 75Ω R = 3.9kΩ toc1 IIP3 (dbm) IIP3 vs. R toc11 INPUT P1dB (dbm) INPUT P 1dB vs. R toc INPUT POWER (dbm) R (kω) R (kω) Pin Descriptions PIN NAME DESCRIPTION 1 Resistor Bias Control. Connect a resistor, R, from to ground. R sets IP3 and supply current. The current through this pin is approximately 6mV divided by R (see Applications Information). 2, 5 Ground. For optimum performance, provide a low-inductance connection to the ground plane. 3 Amplifier Input. AC-couple to this pin with a DC blocking capacitor. External matching network is required for optimum performance. 4 Supply Voltage. Bypass with a capacitor directly to ground at the supply pin. Refer to Line Bypassing section for more information. 6 Amplifier Output. AC-coupled internally. R1 1.2kΩ 1 6 SMA 2 U1 5 SMA L1 3.3nH C1 3 4 Length = 4mils C3 2.2pF C2 VCC GAIN: 17dB IIP3: -3dBm Figure 1. High Gain Design Maxim Integrated 4

5 R1 1.2kΩ 1 6 L2 3.9nH SMA 2 U1 5 SMA L1 3.3nH C1 3 4 Length = 4mils C3 15pF C2 GAIN: 16dB IIP3: +1dBm Figure 2. High Linearity Design (a) (b) Figure 3. Recommended Standby Configurations Applications Information Input Matching Input matching is required for optimum performance. The requires a simple LC matching network, as shown in the Typical Operating Circuit. To further reduce cost and external component count, replace the external inductor with a microstrip transmission line. The Typical Operating Circuit shows the recommended input matching network for the at 245MHz. These values are optimized for best simultaneous gain, noise figure, and return loss performance. Line Bypassing Bypassing the line is necessary for optimum gain/ linearity performance. A transmission line and two capacitors are required, as shown in the schematics in Figures 1 and 2. The optimum dimensions and positions of the components are as follows: the output transmission line dimension is.532in (length) x.12in (width); the distance from C2 to the IC is.352in; and the distance from C3 to the IC is.41in. Please refer to Figures 1 and 2 for component values. Maxim Integrated 5

6 Table 1. Typical Scattering Parameters (R = 75Ω, = +3.V,.) FREQ. S11 S11 PHASE S21 S21 PHASE S12 S12 PHASE S22 S22 PHASE Table 2. Typical Scattering Parameters (, = +3.V,.) FREQ. S11 S11 PHASE S21 S21 PHASE S12 S12 PHASE S22 S22 PHASE Standby Standby mode is achieved by disconnecting as shown in Figure 1. Avoid capacitance at the pin by connecting the bias resistor from to the switch. Layout Issues A properly designed PC board is essential to any RF/ microwave circuit. Use controlled impedance lines on all high-frequency inputs and outputs. Bypass with decoupling capacitors located close to the device pin. For long lines, it may be necessary to add additional decoupling capacitors. These additional capacitors can be located farther away from the device package. Proper grounding of the pins is essential. If the PC board uses a topside RF ground, connect it directly to all pins. For a board where the ground plane is not on the component layer, the best technique is to connect the pins to the board with a plated through-hole located close to the package. Maxim Integrated 6

7 Table 3. Typical Scattering Parameters (R = 3.9kΩ, = +3.V,.) FREQ. S11 S11 PHASE S21 S21 PHASE S12 S12 PHASE S22 S22 PHASE Table 4. Typical Noise Parameters at = +3.V,, R = 75Ω FREQUENCY F MIN (db) Γopt Γopt ANGLE R N (Ω) Table 5. Typical Noise Parameters at = +3.V,, FREQUENCY F MIN (db) Γopt Γopt ANGLE R N (Ω) Table 6. Typical Noise Parameters at = +3.V,, R = 3.9kΩ Chip Information TRANSISTOR COUNT: 87 FREQUENCY F MIN (db) Γopt Γopt ANGLE R N (Ω) Maxim Integrated 7

8 Package Information For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated 8

9 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 2 2/17 Added EXT+, EXT-T, and EXT-T to Ordering Information table 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 217 Maxim Integrated Products, Inc. 9