how would i decrease the frequency?

[hysamir]

I am having my oscillator running at 100Mhz and i want some signal to be at 1Mhz

how would i go from 100 to 1?

 

[flatulent]

You have two main choices. One is to use a digital divider. The other is to make a separate oscillator at the new frequency.

 

[eecs4ever]

The Oscillation frequency is a function of the capacitance you have in your oscillator.

If you increase the capacitance in your oscillator,
does the frequency become lower?

 

[jgarciarivera]

The choices mentioned are good. Either used a frequency divider realized with J-K flip-flops or change the capacitor value of your oscillator.

 

[avlsi]

Yeah,its a good idea to use digital divider like divide by 4 circuit. It decreases error also,as you use digital.

 

[yaxazaa]

don't use two xtal unless you have to. Divided down is the best option

 

[avinash]

if it is compulsory to use 100MHz oscillator in your circuit,then you have only one option to use digital divider circuit using flipflops to get 1MHz frquency.but it will increase your chip area.so if not compulsory,you should go for new 1MHz oscillator.

 

[vlsiattitude]

u can generate divide by 100 counter using synchronous counter. i think ripple counter may create problem at high frequency