Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Analysis of feedback circuit in pspice

Status
Not open for further replies.
G

garimella

Full Member level 5
Joined
Aug 25, 2011
Messages
260
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
3,276
I am trying to build a VCO that is combination of a Integrator and schmitt trigger. U1 is the integrator with reset option using transistor. It also receives external signal.U2 is non inverting schmitt trigger. The circuit is expected to generate sustained oscillations, with schmitt trigger resetting at regular intervals. However, the pspice simulations does not generate any output? what could be the reason?

Circuit.JPG
 

The circuit is expected to generate sustained oscillations, with schmitt trigger resetting at regular intervals.
Click to expand...
Why? The schmitt trigger thresholds are unsuitable, resetting the integrator will never release the trigger.
 

Got it, but how to make the circuit to work?
 

You can e.g. change the ST thresholds by applying an offset to LM311 inverting input.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top