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AMMP-6425-TR1G Datasheet(PDF) 6 Page - AVAGO TECHNOLOGIES LIMITED |
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AMMP-6425-TR1G Datasheet(HTML) 6 Page - AVAGO TECHNOLOGIES LIMITED |
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6 / 11 page  6 AMMP-6425 Application and Usage Recommended quiescent DC bias condition for optimum power and linearity performances is Vdd=5 volts with Vg (-1.1V) set for Idq=650 mA. Minor improvements in per- formance are possible depending on the application. The drain bias voltage range is 3 to 5V. A single DC gate supply connected to Vgg will bias all gain stages. Muting can be accomplished by setting Vgg to the pinch-off voltage Vp. A simplified schematic for the AMMP6425 MMIC die is shown in Figure 12. The MMIC die contains ESD and over voltage protection diodes for Vg, and Vdd terminals. The package diagram for the recommended assembly is shown in Figure 13. In finalized package form, ESD diodes protect all possible ESD or over voltage damages between Vgg and ground, Vgg and Vdd, Vdd and ground. Typical ESD diode current versus diode voltage for 11- connected diodes in series is shown in Figure 14. Under the recommended DC quiescent biasing condition at Vds=5V, Ids=650mA, Vgg=-1V, typical gate terminal current is approximately 0.3mA. If an active biasing technique is selected for the AMMP6425 MMIC PA DC biasing, the active biasing circuit must have more than 10-times higher internal current that the gate terminal current. An optional output power detector network is also provided. The differential voltage between the Det-Ref and Det-Out pads can be correlated with the RF power ( ) ofs ref V V V V − − = det emerging from the RF output port. The detected voltage is given by : where Vref is the voltage at the DET_R port, Vdet is a voltage at the DET_0 port, Vofs and is the zero-input- power offset voltage. There are three methods to calculate Vofs : 1. Vofs can be measured before each detector measurement (by removing or switching off the power source and measuring Vref - Vdet). This method gives an error due to temperature drift of less than 0.01dB/50°C. 2. Vofs can be measured at a single reference temperature. The drift error will be less than 0.25dB. 3. Vofs can either be characterized over temperature and stored in a lookup table, or it can be measured at two temperatures and a linear fit used to calculate Vofs at any temperature. This method gives an error close to the method #1. The RF ports are AC coupled at the RF input to the first stage and the RF output of the final stage. No ground wired are needed since ground connections are made with plated through-holes to the backside of the device. dd V g V Three stage 0.5W power amplifier in RF out RF DET_O DET_R DQ Figure 12. Simplified schematic for the MMIC die |
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