Question and Problems a How does the RC stages affect the oscillator Number of

# Question and problems a how does the rc stages affect

• 18

This preview shows page 15 - 18 out of 18 pages.

Question and Problems: a. How does the RC stages affect the oscillator? Number of RC stages help improve the frequency stability. The total phase shift introduced by the feedback network is 180 degrees, if we are using N RC stages each RC section provide 180/N degree phase shift. b. Why does it uses 3 RC stages? When 2 RC sections are cascaded, the frequency stability is low. For 3 sections cascaded the phase change rate is high so there is improved frequency stability. Hence phase shift oscillators make use of 3 RC sections in which each section provides a phase shift of 60 degree. c. What happens when the variable resistor R4 is adjusted? R4 is where you adjust the gain. With gain of the inverting amplifier being –Rf/Ri or in this circuit, - R4/R5. d. What is the total phase shift of the circuit? Explain. With each RC stage having a 60degree phase shift resulting to a 180degree phase shift on the 3 RC sections and the inverting amplifier having a 180 degree phase shift as well, the total phase shift is 180+180=360 degree phase shift.
e. Why is it essential to have a unity loop gain and a degree phase shift? Why is it necessary to have Av equal to 29? We can get this gain value of the amplifier (A) so that the oscillations occur in the circuit by adjusting R4 and R5. If the gain should be higher than 29, the input signal becomes distorted while as having the gain lower than 29 eliminates oscillation. The unity loop gain and 360 degree phase shift are essential for the sustained oscillation.
Christian Allein Pinca COMPUTER ENGINEERING Technological Institute of the Philippines (TIP) QC Address: 3 rd St.Major marcos, veterans village brgy. Pasong tamo, Q.C. Cellular No.: +639770526963 Seekin a challenging career with a progressive organization that provides an opportunity to capitalize my technical skills & abilities in the field of Computer Engineering. Analyze complex problems and provide solutions. Good Communication Skills Knowledge in C , C+ + , and Python Language. Knowledge in HTML. Knowledge in Basic electronics Honest Hard- Working Diligent None Data Driven World with Internet of Things Seminar Rooms A&B , Technological Institute of the Philippines November 23, 2019 Able to work under pressure. Research Oriented Skills CAREER OBJECTIVE KNOWLEDGE, SKILLS AND ATTITUDE LEADERSHIP ACTIVITY SEMINAR AND TRAINING ATTENDED OTHER SKILLS
REFLECTION: I have learned that patience and time is needed in learning new things. On top of that a good understanding and knowledge of circuits and electricity is required so that you can use it correctly to create circuits and being able to measure the resistance, voltage and current. The key idea of this is to learn from your mistakes. This will help me move towards my goal because I won't make the same mistakes that I made during this semester I will be able to apply the knowledge and skills I learned here in my nearby future.

#### You've reached the end of your free preview.

Want to read all 18 pages?

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern