adnan012
Advanced Member level 1
hi,
i am using SD57060 LDMOS for 850MHz TO 870MHz band.
The amplifier specs are
Vdd 28v
vgs 2.67v @idq = 100mA
input power = 1.9watts.
amplifier gain 12db approax
output power 20 watts.
The amplifier circuit/matching is designed using ADS momentum simulation.
So far i have damaged 3 LDMOS during testing. The amplifier is always terminated
with dummy load or matched antenna during power up. After sometime or after on/off power supply the vgs (gate to source) voltage disappears and voltmeter read 0 volt. Gate to source shows 10-25 ohm resistance.Amplifier still works but the reason for damage is still unknown. Is there any transient in power supply which is causing
the damage.
i am using SD57060 LDMOS for 850MHz TO 870MHz band.
The amplifier specs are
Vdd 28v
vgs 2.67v @idq = 100mA
input power = 1.9watts.
amplifier gain 12db approax
output power 20 watts.
The amplifier circuit/matching is designed using ADS momentum simulation.
So far i have damaged 3 LDMOS during testing. The amplifier is always terminated
with dummy load or matched antenna during power up. After sometime or after on/off power supply the vgs (gate to source) voltage disappears and voltmeter read 0 volt. Gate to source shows 10-25 ohm resistance.Amplifier still works but the reason for damage is still unknown. Is there any transient in power supply which is causing
the damage.