Re: Gaasfet switch driver needed
- From: Rene Tschaggelar <none@xxxxxxxx>
- Date: Fri, 27 Oct 2006 09:27:31 +0200
Charles Luke wrote:
I need a switch driver that can switch in 1 to 3 nsec. Complementary
drive outputs, 0 to -5 or -8 volts. Driving a SPDT Gaasfet switch.
I've tried differential A-to-D drivers but they are not fast enough.
Input to the driver is from a cmos asic. Also looked at comparators
with ECL output but they don't have the voltage swing.
Impellimax makes a driver but they want mucho$.
Other constraints. Battery powered(low powered). Small size.
I'm looking at a discrete driver or biasing the Gaasfet switch.
Can bias the Gaasfet switch for a 5V ground and use 0 to 5V switch
outputs for the driver. This will be at 4.5GHz. Anyone ever done this?
What are the ramifications? Lost isolation? Bad RL? If I go this way,
is CPWaveguide the way to go to minimize via inductance?
What is your control signal ?
TTL 50 Ohms ? PECL, LVPECL, NECL, LVDS ?
And you need to provide a current down
into -5V .. -8V ?
Rene
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