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Using Cascaded ABA Series for High Gain and High Isolation Amplifier up to 2400 MHz - App Note

From Avago Technologies
 

 
This application note describes a two-stage cascaded amplifier using Avago Technologies Broadband Amplifier (ABA) silicon RF ICs. Avago Technologies offers two series of ABA devices; ABA-3 series that operate from a 3 volts supply and ABA-5 series that operate from a 5 volts supply. High gain (>40dB) and good noise figure (<4dB) can be achieved using this cascaded configuration, making it suitable for IF amplifiers in DBS applications. In addition, the high reverse isolation (>55dB) and flat output power at the saturation region offer advantages for this cascaded amplifier when used as LO buffers. The amplifier is designed to operate from a supply voltage of 5 volts for ABA-5 series and 3 volts for ABA-3 series as shown in the schematic diagram in Figure 1. The power supply voltage is applied at Pin 4 (Vcc pin) and Pin 6 (RF output pin) of each of the ICs. RF chokes are required at Pin 6 on both ICs to provide low resistance at DC and high impedance at the operating frequency (RF) and these RF chokes are terminated with bypass capacitors. Blocking capacitors are used on the input and output of the ICs. Based on the internal circuit design of ABA series, the gain can be extended down to DC but the limit would be defined by the values of the blocking capacitors and choke.
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