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OZ960G

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File Size : 116 KB Manufacturer:MICRO Description:An optimal output match for dual mode applications is set by connecting capacitors C8 and C9 to the package pin using approximately 0.233 inches of a 50 ohm transmission line. These capacitors should be located adjacent to each other and separated by 0.010 inches. Lower efficiency will result if a single capacitor of equivalent value were substituted. Fine adjust the capacitors location to obtain a uniform saturated output power response versus frequency using a single tone RF input. Saturated output power is typically measured at +7dBm input power and should be 32.3 to 32.5dBm with a 3.5 volt supply. This condition will yield typically 50dBc ACPR1 and 60dBc ACPR2 at 28.5dBm output power and a 3.5 volt supply using a CDMA waveform. If a greater than 50 ohm impedance transmission line is used to conserve space, transition the line to 50 ohms slightly prior to the optimum tuning point to avoid undesirable effects from the otherwise residual inductance following the tuning elements. Once the optimum tuning point has been established this remains fixed for all other amplifiers. For the dc bias injection circuit choose an inductor with a maximum series resistance rating of less than 0.15 ohms for best efficiency and overall performance versus supply voltage. The two 1.5uF tantalum bypass capacitors chosen for this circuit are low ESR type capacitors with a maximum rating of 1.5 ohms. The capacitor ESR is critical for achieving the best ACPR possible from the amplifier. Other capacitors may be substituted, although larger values may be necessary to achieve equivalent performance. These components should be placed at the tie point for VD1 and VD2 and as close to the amplifier as possible. Finally, connect pins 1-3 using one solid metal pad as opposed to three individual pads for each pin.


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