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MGA-52543-TR2G Datasheet(PDF) 9 Page - Agilent(Hewlett-Packard) |
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MGA-52543-TR2G Datasheet(HTML) 9 Page - Agilent(Hewlett-Packard) |
9 / 15 page 9 MGA-52543 Applications Information Description The MGA-52543 is a low noise, linear RFIC amplifier GaAs PHEMT (Pseudomorphic High Electron Mobility Transistor) designed for receiver applications in the 300 MHz to 6.0 GHz frequency range. The device combines low noise performance with high linearity to make it a desirable choice for receiver front end stages as well as driver applications. The MGA-52543 operates from a +5 volt power supply and draws a nominal current of 55 mA. The RFIC is contained in a miniature SOT-343 (SC-70 4-lead) package to minimize printed circuit board space. This package also offers excellent thermal dissipation and RF characteristics. The device is focused at cellular/PCS basestation applications. The high frequency response of the MGA-52543 extends through 6 GHz making it an excellent choice for use in 5 GHz RLL as well as 2.4 and 5.7 GHz spread spectrum and ISM/license-free band applications. Internal, on-chip capacitors limit the low end frequency response to applications above approximately 300 MHz. Application Guidelines The MGA-52543 is very easy to use. For most applications, all that is required to operate the MGA- 52543 is to apply +5 volts to the RF output pin, and match the RF input and output. RF Input To achieve lowest noise figure performance, the input of the MGA-52543 should be matched from the system impedance (typically 50 Ω) to the optimum source impedance for minimum noise, Γ opt. Since the real part of the input of the device impedance is near 50 Ω and the reactive part is capacitive, a simple series inductor at the input is often all that is needed to provide a suitable noise match for many applications. RF Output The RF Output port is closely matched to 50 Ω, a simple series inductor at the output will help to improve the input match, gain and power response of the device. DC Bias DC bias is applied to the MGA- 52543 through the RF Output connection. Figure 1 shows how an inductor (RFC) is used to isolate the RF signal from the DC supply. The bias line is capaci- tively bypassed to keep RF from the DC supply lines and prevent resonant dips or peaks in the response of the amplifier. The DC schematic for an MGA- 52543 amplifier circuit is shown in Figure 1. RFC +5V L2 L1 C1 C2 42 Figure 1. Schematic Diagram with Bias Connections. A DC blocking capacitor (C1) is used at the output of the MMIC to isolate the supply voltage from succeeding circuits. While the RF input terminal of the MGA-52543 is at DC ground potential, it should not be used as a current sink. If the input is connected directly to a preceding stage that has a DC voltage present, a blocking capacitor should be used. Setting the Bias Voltage for Linearity The MGA-52543 will operate from approximately 2 volts with reduced performance. The MGA- 52543 typically pulls 53 mA at 5V. The higher voltage increases amplifier linearity by boosting output power (P1dB) typically from 14 dBm at 3V to 18 dBm at 5V. An absolute maximum recommended supply voltage for this device is 5.5V. Optimum linearity perfor- mance is obtained at 5V supply. Typical performance of gain, noise figure and P1dB output power over a wide range of bias voltage is shown in Figure 2. SUPPLY VOLTAGE (V) 1 20 16 12 8 4 0 5 24 3 NF Gain P1dB Figure 2. Gain, Noise Figure and Output Power vs. Supply Voltage. Input and output impedance and noise figure for the amplifier are unaffected by increasing the supply voltage from 3V to 5V. PCB Layout A recommended PCB pad layout for the miniature SOT-343 (SC-70) package that is used by the MGA- 52543 is shown in Figure 3. |
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