sinusoidal oscillation HNC ELECTRONICS

Discussion in 'Homework Help' started by iso_b, Feb 24, 2008.

1. iso_b Thread Starter New Member

Jan 8, 2008
5
0
hello ppl
i need help with sinusoidal oscillation, i need to find a block diagram off how it is acheived and a suitable example containing op amps and transistor devices. Last but not least i cant seem to find any formulae used to analyse the circuits...can you please helppp???

2. Papabravo Expert

Feb 24, 2006
12,290
2,728
This type of circuit is called a quadrature oscillator. It solves the standard 2nd order differential equation rpresented by either a spring-mass-damper system or a series LRC circuit.

Here is the top Google Hit
http://www.ti.com/sc/docs/apps/msp/journal/aug2000/aug_07.pdf

Is there some reason why you could not have found this on your own?

3. Ron H AAC Fanatic!

Apr 14, 2005
7,012
681
Why do you call this a quadrature oscillator?

4. Audioguru Expert

Dec 20, 2007
11,251
1,350
The quadrature oscillator is about 3/4 of the way down.

5. studiot AAC Fanatic!

Nov 9, 2007
5,003
523
The quadrature oscillator actually produces two simultaneous outputs,
sine and cosine. These are the same wave phase shifted by 90 degrees or 'in quadrature'

6. Ron H AAC Fanatic!

Apr 14, 2005
7,012
681
I know what a quadrature oscillator is. My point to Papabravo is that the quadrature oscillator is one type of sinewave oscillators, out of many.

7. Papabravo Expert

Feb 24, 2006
12,290
2,728
I was familiar with the terminology, and the method, from programming analog computers in my youth. I searched for "Quadrature Oscillator", found the paper, found figure 8, which the author called a quadrature oscillator, and let it go at that.

I never made anything remotely approaching a claim that it was the only kind of sinewave oscillator. I'd like you to explain why you feel that I did make such a claim. I would claim that the analysis is straightforward if you have seen the derivation of the differential equation for a spring-mass-damper or a series RLC circut.

8. Ron H AAC Fanatic!

Apr 14, 2005
7,012
681
Well, Papabravo, I wasn't attacking you per se. I just didn't want readers to think that all sinusoidal oscillators were called "quadrature oscillators". The OP said,
. You responded with,
Where did you say that there were other types of sinewave oscillators? Now, if you had said, "quadrature oscillators are one form of sinewave oscillator", that would be accurate. However, If I were a novice reading your response, I might be inclined to think that all sinewave oscillators were quadrature oscillators.
As we learned studying Aristotelian logic, all dogs are animals, but not all animals are dogs. Before taking that class, I was confused.