Electronics > Beginners
Square wave generation & current
zanzeoo:
Hello
I'm trying to desing a square wave generator ( or function generator amplifier) with these features :
Pure resistive load (33 ohms)
Ouput from 1Vpp to 5 VPP
Frequency 2Mhz
Here is what i've done :(see attachement)
TC4425 with a clock from function generator (Dclock) 0-5Vdc
the Ouput Ur1 works fine with a 5VPP but not below ( because of VDD of TC4425)
VDD is done with an external power supply
Is there a better way to do the same with the possibility to choose VPP output below (1 VPP for exemple )
I guest with external low VGSth mosfet ??
zanzeoo:
ERRATA : R1 is 33 ohm , not 10K
iMo:
There are high-speed opamps, capable of driving 50ohm loads. I would try with those. You may set the gain with a resistor in the feedback.
zanzeoo:
well , do you have a reference of these opamps ? , i need a 33ohms load , not 50 ... ;)
David Hess:
Is the output suppose to be balanced or single ended? A variable balanced output would be somewhat unusual. Your example actually shows a balanced 10 volt peak-to-peak output.
Is this intended to drive a transmission line? Usually a series resistance is used to set the output impedance although a parallel resistance and current source can be used also.
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