Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Convert sine wave to square wave (VHF)

Status
Not open for further replies.
khungbopro

khungbopro

Member level 1
Joined
Jan 8, 2013
Messages
33
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,479
Hi,
I have a sine wave source and want to convert to square wave and divider by 2 (50% duty cycle).
I used inverter or trigger inverter to convert waveform but IC 74xx family not response in high frequency (150MHz - 200MHz). --> The output is still sin wave or logic high if input frequency is very high.
I connect a D-Flip-Flop follow that Inverter to divider by 2. I worry that D-Flip-Flop cannot div 2 (50% duty cycle) if input signal is sine wave because sin_wave's edge slope lower than square_wave's edge slope.
Could anyone support me to solve this problem? (or recommend some IC)
Thank in advance!:p
 

Hi,

I'd use a fast comparator to convert sine into square wave.
And for div2 you may use DFF, or TFF.

For sure you need to specify your recomendations, like timing...duty cycle
Then you need to check datasheets for comparator and FF.

You need fast logic devices, maybe ECL.

Klaus
 
Unsuitable input waveform might be a problem, however near to maximum frequency, a FF will work with sine input voltage of sufficient magnitude.

But did you review frequency limits in 74xx datasheets? Maximum clock frequency of 7474, 74HC74 and 74LS74 is about 25 MHz. Only 74S74 reaches typically 110 MHz, 74AHC74 even more (but still not 200 MHz).
 
I did look at some divide by two prescaler chips, particularly the MC12093.
https://www.onsemi.com/pub_link/Collateral/MC12093-D.PDF

This will accept dc to 1Ghz sine wave input, requires 5v supply, and has square wave output, but the output will require stepping up to 5v logic level.

Another chip of interest might be the HFA1130. This is an 850 Mhz high gain amplifier with precision settable output clipper. It will convert low level inputs to pretty reasonable 5v square waves at 100 Mhz+
https://www.intersil.com/content/dam/Intersil/documents/hfa1/hfa1130.pdf
 
Warpspeed said:
I did look at some divide by two prescaler chips, particularly the MC12093.
https://www.onsemi.com/pub_link/Collateral/MC12093-D.PDF

This will accept dc to 1Ghz sine wave input, requires 5v supply, and has square wave output, but the output will require stepping up to 5v logic level.

Another chip of interest might be the HFA1130. This is an 850 Mhz high gain amplifier with precision settable output clipper. It will convert low level inputs to pretty reasonable 5v square waves at 100 Mhz+
https://www.intersil.com/content/dam/Intersil/documents/hfa1/hfa1130.pdf
Click to expand...

MC12093 is suitable for waveform input/output, but I need that output is CMOS level.
Could you give me some advice?
 

If you use the MC12093 to divide down your frequency into a nice symmetrical square wave, then use the HFA1130 to amplify that up to a five volt logic level.
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top