I am building a fast switch driver circuit . Switching speeds are similar to the bipolar design.
The circuit provides 35nSec rise and fall times. This circuit will turn the switch on and off within 50nSec.
My target is to have faster speed for Turn-On/Turn-Off . 35nSec would be okay for the T-On/T-OFF , but I want to reach between 15nSec ~ 30nSec.
Do you think that BSS84DW (http://www.diodes.com/datasheets/ds30204.pdf) can be replaced with NDC7003P or NDS9948 ?.
What speed would i reach If I am going to use NDC7003P or NDS9948 ?.
http://www.fairchildsemi.com/ds/ND/NDC7003P.pdf
http://www.fairchildsemi.com/ds/ND/NDS9948.pdf
Are you familiar with (DUAL P-CHANNEL ENHANCEMENT MODE MOSFET). I have a working circuit that accept a logic input (0V/+5V) to bias a switch VC1 & VC2 (0V/-40V).
I had to use BSS84DW (http://www.diodes.com/datasheets/ds30204.pdf) , but the circuit provide a switching speed on and off within 50nSec and rise/fall 35nSec.
I have already found a replacement to BSS84DW with NDC7003P (http://www.fairchildsemi.com/ds/ND/NDC7003P.pdf) which should be faster , but I am not sure if it will use the same resistors , capacitors etc..
I want to know what should I get a Turn-OFF/Turn-ON speed if I am going to use the new PowerTrench MOSFET (NDC7003P) ?.
Please see the Driver circuit of the spdt switch that i am integrating into the switch.
The typical switch Ton/Toff speed is less than 15nSec but their rdriver has Ton/Toff 50nSec and Rise/Fall 35nSec. I thought of tuning the circuit to get a faster Ton/Toff.
Regarding the resistors R3A , R3B .. Should these resistors limit the current that should be passing to the Switch Voltage Control Lines 1 , 2 ?.
I got mentioned that .. In order to prevent negative voltage from appearing at the output of the inverters, the negative voltage applied to the level shifters must also equal the positive supply voltage. Once +/-5V is set on the circuit, the negative switch bias V- can be set anywhere in the -10 V to -40V range.
http://obrazki.elektroda.pl/3646151600_1371494410.png
The maximum rating of the control current at the switch is between -1 to 7.8 mA.
What do you suggest a value of the resistors at the circuit should be ?.
The link to the switch http://www.triquint.com/products/p/TGS2351 .
I really appreciate your recommendation
Ghassan