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LO Buffer Applications Uing Avago'sSilicon Amplifiers - App Note

From Avago Technologies
 

 
An oscillator or a voltage-controlled oscillator (VCO) is usually buffered with an external amplifier prior to the LO port of a mixer as in figure 1. This buffer amplifier is used to prevent a shift on the oscillating frequency, or a frequency pull, caused by the load variation at the oscillator's output. It provides good reverse isolation and delivers a constant power level to the LO port. The Avago Technologies ABA-3X563 RFICs are a series of silicon broadband amplifiers designed to operate from a 3V voltage supply. This series offers flat gain (>20dB) across a wide frequency band (up to 3.5GHz for ABA-31563 and 2.5GHz for ABA-32563), good input and output return loses, unconditional stability, good reverse isolation (30dB) and flat output power characteristics. These characteristics make this amplifier suitable for LO buffer applications. This note will demonstrate the characteristics of the ABA-3X563 series for LO buffer applications at 2GHz.
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