For the PE43x0x, can you explain the Switching Rate, Switching Time, and Settling Time specifications listed on the datasheet?
Switching Rate is the frequency at which you can change the attenuation state. We use an onboard NVG (Negative Voltage Generator) to provide VSS that is used in biasing the switch FETs. The Switching Rate of 25 kHz (40us) is set by the NVG recharge time. On some DSAs, there is a VSS bypass option which allows the user to externally provide VSS, eliminating the Switching Rate limitation. Switching Time applies to the actual switching event itself. The Switching Time is measured from the point the control signal reaches 50% of final value to the point the output signal reaches within 10% of its target value. For example, for the PE43702, that number is 650ns. Settling Time is similar to Switching Time, but instead the metric is within 0.05 dB of final value after control signal is at 50% of final value. For the PE43702, the Settling Time is 4us. This performance is significantly faster and more repeatable than competing GaAs technologies due to innate surface passivation in CMOS processi
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