+ Post New Thread
Results 1 to 15 of 15

12th August 2005, 01:02 #1
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
sine wave input to a flip flop
How do i Divide the Frequency?
If i take my function generator output 1K hz what circuit can i build to divide this frequency down or UP?
Oscillators frequencys outputs 440hz how do i divide the oscillators frequency down or UP?

12th August 2005, 01:02

12th August 2005, 01:47 #2
 Join Date
 Jul 2002
 Location
 Middle Earth
 Posts
 4,629
 Helped
 489 / 489
 Points
 36,491
 Level
 46
convert sine wave to cml
You can divide using a digital counter type circuit. You can multiply by using a PLL with a divider in the feedback loop.

12th August 2005, 02:00 #3
 Join Date
 Apr 2002
 Location
 USA
 Posts
 3,942
 Helped
 660 / 660
 Points
 32,456
 Level
 44
dividing sine wave frequency
Another possible method is to use a bandpass filter to extract one harmonic of your input signal. For example, if your input is a 1 kHz square wave, a 3 kHz bandpass filter would pass only the third harmonic, giving you a 3 kHz sinewave.

12th August 2005, 02:21 #4
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
cml divider square wave input
Yes i want to use Sine Wave inputs that divide the Sine wave frequency
what circuit would do this?
To divide the Frequency of Sine Waves?
Are Oscillators Frequencys Sine waves?
How do divide the oscillators sine wave frequencys?

12th August 2005, 02:53 #5
 Join Date
 May 2005
 Location
 Yk ID
 Posts
 46
 Helped
 5 / 5
 Points
 1,923
 Level
 10
analog frequency dividers
well a picture worth thousand words
it's a divider design which is pretty selfexplanatory. One can choose between division by 1, 10 or 100 or no output (tied low) using the CONTROL input connected to the analog multiplexer HC4052. AC04are used to drive 3 indication LEDs as well as to buffer the signal. A single HC390 includes 2 divider by 2 and 5 which can be combined as 2 dividers by 10.

12th August 2005, 05:04 #6
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
Re: Analog Frequency Dividers
Is that circuit mostly for Square waves only or pwm wave forums ?
Or can i use a Sine Wave input also? will it divide the sine wave?

12th August 2005, 10:05 #7
 Join Date
 Dec 2003
 Location
 China
 Posts
 219
 Helped
 26 / 26
 Points
 3,814
 Level
 14
Re: Analog Frequency Dividers
Two ways:
1. You can use CML circuit to divide sine wave signal.
2. Reshape sine wave signal to square wave then divide it with digital counters.

12th August 2005, 10:05

12th August 2005, 20:59 #8
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
Re: Analog Frequency Dividers
Whats a CML circuit?
What is CML mean?

15th August 2005, 02:54 #9
 Join Date
 Dec 2003
 Location
 China
 Posts
 219
 Helped
 26 / 26
 Points
 3,814
 Level
 14
Re: Analog Frequency Dividers
CML means Current Mode Logic. It can divide sine wave signal.

15th August 2005, 05:27 #10
Re: Analog Frequency Dividers
usually a high dividebytwo circuit is in CML logic
the basic cell is TFF(toggke flipflop)
there are many paper in IEEE in this topic
the highest CML frequency divider already reach +100GHz

16th August 2005, 04:04 #11
 Join Date
 Dec 2004
 Posts
 26
 Helped
 1 / 1
 Points
 2,002
 Level
 10
Analog Frequency Dividers
If no cost consideration, any of the following is an option:
1.CML circuit;
2.convert sine wave to squarewave, then divided digitally, then convert the square wave back to sine wave;
3.use a PLL;

16th August 2005, 05:33 #12
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
Re: Analog Frequency Dividers
How do i put a Sine wave 1Khz input in a PLL circuit with a output thats half the
frequency?
How do i put a Sine wave 1Khz input in a CML circuit with a output thats half the
frequency?
I'm new to this PLL and CML circuit never worked or built them how do i start this
are PLL and CML in a Digital circuit book because i can't find any PLL or CML circuit in any of my analog or digiatl books where do i start please?

16th August 2005, 05:33

16th August 2005, 05:43 #13
 Join Date
 Dec 2003
 Location
 China
 Posts
 219
 Helped
 26 / 26
 Points
 3,814
 Level
 14
Re: Analog Frequency Dividers
Originally Posted by walters
2. Input 1KHz sine wave to CML DFF, output 0.5KHz sine wave.
3. Search CML DFF on internet!

16th August 2005, 05:59 #14
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
Re: Analog Frequency Dividers
How does the PLL circuit Divide the frequency Digitally or analog ?
Whats kind of PLL circuit does this?
How does the CML circuit Divide the frequency Digitally or analog ?
Whats kind of CML circuit does this?

16th August 2005, 20:22 #15
 Join Date
 Jun 2005
 Posts
 599
 Helped
 1 / 1
 Points
 4,902
 Level
 16
Re: Analog Frequency Dividers
A flip flop (bistable multivibrator) divides by two, and was commonly used in old electronic organs.
Yes i want to use Sine Wave inputs that divide the Sine wave frequency
what circuit would do this?
To divide the Frequency of Sine Waves?
Are Oscillators Frequencys Sine waves?
How do divide the oscillators sine wave frequencys?
Block diagram:
Sine wave>>>Flip flop>>>divides the freq down>>>Square wave output
A flip flop (bistable multivibrator) divides by two
Most of the Flip flops in my digital book are just switching flip flops i don't
see any Frequency based flip flops
So i put a sine wave in the input of a flip flop and the output of the flip flop with be a Square wave but half of the freqency of the inputs freqency
HOW do i set the Flip flops resistors or capacitors to a FIX Frequency to?
What sets the Flip Flops Freqency?
What sets the Flip Flop to Divided?
+ Post New Thread
Please login