# Need Circuit for RF frequency counter and seven segment display.

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#### Sanoj Singh

Jan 1, 1970
0
Can any one suggest me any circuit for displaying RF frequency at around 3GHz? This RF is produced using DRO and input to the display circuit is provided after dividing the signal frequency by 4 (F/4 module). i.e. 3GHZ/4 == 750MHZ is to be read by the display circuit. And provisions be made to multiply it again to 3GHz. Precision for displaying 3GHz is upto 7 digitby using 8 seven segment displays.

So, can any one suggest me any circuit for displaying frequency using 8No. seven segment displays in this fashion ===> 88888.888 MHZ (ie."03000.000" MHz)

Thanx

-Sanoj Singh

G

#### George Herold

Jan 1, 1970
0
Can any one suggest me any circuit for displaying RF frequency at around 3GHz? This RF is produced using DRO and input to the display circuit is provided after dividing the signal frequency by 4 (F/4 module). i.e. 3GHZ/4 == 750MHZ is to be read by the display circuit. And provisions be made to multiply it again to 3GHz. Precision for displaying 3GHz is upto 7 digitby using 8 seven segment displays.

So, can any one suggest me any circuit for displaying frequency using8 No. seven segment displays in this fashion ===> 88888.888 MHZ (ie. "03000.000" MHz)

Thanx

I don't know much about high speed stuff... like what's the fastest counterone can buy. But you could just divide your input (by say 100) so 30MHz. and then count for one second.

George H.

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#### Helmut Wabnig

Jan 1, 1970
0
Can any one suggest me any circuit for displaying RF frequency at around 3GHz? This RF is produced using DRO and input to the display circuit is provided after dividing the signal frequency by 4 (F/4 module). i.e. 3GHZ/4 == 750MHZ is to be read by the display circuit. And provisions be made to multiply it again to 3GHz. Precision for displaying 3GHz is upto 7 digit by using 8 seven segment displays.

So, can any one suggest me any circuit for displaying frequency using 8 No. seven segment displays in this fashion ===> 88888.888 MHZ (ie. "03000.000" MHz)

Thanx

-Sanoj Singh

2,6 Ghz enough?
http://www.ebay.at/itm/New-Black-Mini-Handhold-Frequency-Counter-IBQ101-/170662196301

I have seen >3Ghz versions
http://www.ebay.at/itm/WATSON-HUNTER-10MHz-3GHz-50-FREQUENCY-COUNTER-/350969559946

w.

T

Jan 1, 1970
0
Can any one suggest me any circuit for displaying RF frequency at around 3GHz? This RF is produced using DRO and input to the display circuit is provided after dividing the signal frequency by 4 (F/4 module). i.e. 3GHZ/4 == 750MHZ is to be read by the display circuit. And provisions be made to multiply it again to 3GHz. Precision for displaying 3GHz is upto 7 digit by using 8 seven segment displays.

So, can any one suggest me any circuit for displaying frequency using 8 No. seven segment displays in this fashion ===> 88888.888 MHZ (ie. "03000.000" MHz)

This is a divide by 1000.
http://www.qsl.net/n/n9zia/pre1/index.html

For a 8 digit counter just add another display sections.

S

#### Sanoj Singh

Jan 1, 1970
0
I don't know much about high speed stuff... like what's the fastest counter one can buy. But you could just divide your input (by say 100) so 30MHz.. and then count for one second.

George H.

Thanx!!!

S

#### Sanoj Singh

Jan 1, 1970
0

I assume this is for a school project? If it's been done before, ask

The way I know how to do this is with a prescaler that takes the insanely

high frequency signal (where the threshold of "insanely high frequency"

just keeps going up every year) and divides it down to something that can

be handled by more ordinary logic. Then you follow that with a regular

frequency counter.

In this degenerate age* you don't even have to do the counter with a ton

of 7400-series logic: instead you can have an architecture that goes

input --> prescale --> FPGA --> display

If your FPGA pins can't source enough current to light up a display

segment, then you may need to go FPGA --> buffer --> display, but that's

a minor issue.

* I learned circuit design in the 7400-series logic era. It was a

degenerate age, where you didn't even have to build the counter with

bunch of discrete transistors and resistors, but could, instead, use 7400-

series logic. If you take the opinion of the honored elders going back

as far as written records survive and integrate them over time, you'll

find out that in the year 2000 BCE we were all highly moral gods, and now

we're pond scum.

--

Tim Wescott

Wescott Design Services

http://www.wescottdesign.com

Thanx!!!

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