Generating two Square wave 180 degrees out of phase

[vinay13]

i want to generate two square waves 180 degrees out of phase of 300KHZ using PWM of pic 18F4620...and the compiler i m using is MIkroC.
i have successfully generated a single square wave at one PWM channel. i need help to generate another square wave of same frequency but 180 degrees out of phase..!!

 

[betwixt]

IF you REALLY need 180 phase shift you need to use a delay circuit but if the other signal to be the opposite polarity just use an inverter.

Brian.

 

[chuckey]

If you want a true 180 degree out of phase, then delay one signal by 1/2 of time period of the clock.
Frank

 

[myfaithnka]

THERE IS AN IC 4048 WHICH GENERATES TWO OUT OF PHASE SQUARES.

YOU CAN SIMPLY USE A UNITY GAIN OPAMP INVERTER HERE AT PICS OUTPUT.
SELECT THE RESISTORS (INPUT AND FEEDBACK ) FOR A GAIN OF ONE BY Ri =Rf/10.

i hope this will do it for you.

select an opamp with a bandwidth of 500 Khz.

another idea is usage of a transistor with SL 100 .

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another idea is like this,

you define output of pins a,b as the positive and negetive of a value stored in a registor.
now vary this value between its positive and negetive.(by software of course). i hope this algorith will work.

I am not familiar with pic platform.