neazoi,
The 74F74 will operate similarly to the Cd4013, except that the set and clear inputs of the 4013 are active high, so the CD4013 set and clear inputs should be connected to ground if they are not used.
Regards,
Kral
The set and clear inputs force the output of the flip-flop to a known state. If the set input is active, the device will go to and remain in the "1" state. Similarly, if the clear input is active, the device will go to and remain in the "0" state. In both cases, the clock will have no effect on the output. If you don't want to force the device to a known, fixed state, then the set and clear inputs must be set to the inactive state. In the case of the 74F74, this means connecting them to Vcc. In the case of the CD4013, this means connecting them to ground.
The set and clear inputs force the output of the flip-flop to a known state. If the set input is active, the device will go to and remain in the "1" state. Similarly, if the clear input is active, the device will go to and remain in the "0" state. In both cases, the clock will have no effect on the output. If you don't want to force the device to a known, fixed state, then the set and clear inputs must be set to the inactive state. In the case of the 74F74, this means connecting them to Vcc. In the case of the CD4013, this means connecting them to ground.
??? If you filter the harmonics you WONT get a square wave!
Can you explain why you need the quadrature phases, it might help us to advise on a better way to produce them or a solution to the flip-flop method.
Brian.
What kind of mixers are they and are they working at a single frequency or are they fed from a tunable oscillator source?
It may be easier than you think, don't forget that 0 and 180 degrees are the same signal inverted and so are 90 and 270 degrees, you may only need one 90 degree shifter and two inverters.
Brian.
the f4f74 can provide up to 30mhz in 4 phases with this, since it's input limit is 120mhz. As I said earlies the basic problem is to have an oscillator running from 4-120mhz to get 1-30mhz out. Unless you use a dds with shifted outputs it is difficult to maintain stability.
An idea would be to use the harmonics of an HF oscillator and filter the fundamental with a really good filter but again stability would be an issue on harmonics.
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