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› 3.3 V to 1.8V level converter
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3.3 V to 1.8V level converter (Read 4842 times)
aman gupta
Community Member
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Posts: 34
India
3.3 V to 1.8V level converter
Aug 10
th
, 2014, 8:37am
I want to convert a square wave with high level of 3.3 V & low level of 0V to a square wave of high level of 1.8 V and low level 0V. Frequency of square wave is 1 MHz in one case and 25 MHz in other case. I have the circuit for the converter as shown in the figure. I simulated this circuit both in LT Spice & Tina. The circuit simulation is working for 1MHz signal but with some delay. And it is not working for 25 MHz. May be because switching time of BJT is high as compared to period of the signal. Suggest some alternative for that or any modification in the circuit. And also I am reluctant to use any SMD level translator IC.
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raja.cedt
Senior Fellow
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Posts: 1516
Germany
Re: 3.3 V to 1.8V level converter
Reply #1 -
Oct 7
th
, 2014, 2:14am
Hello,
Try to check opamp closed loop bandwidth or please show 3 node signals....
or thy this structure which is very common for LV to HV...
Thanks,
Raj.
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aaron_do
Senior Fellow
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Posts: 1398
Re: 3.3 V to 1.8V level converter
Reply #2 -
Jan 6
th
, 2015, 11:59am
If this is a CMOS IC, you can just use I/O transistors in an inverter configuration. In your circuit, the 22k/15k ohm resistors could be limiting your bandwidth...
Aaron
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there is no energy in matter other than that received from the environment - Nikola Tesla
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