1 Analysis of RDS Networks by Prof. T. S. Rathore. EE Dept., IIT Bombay March 2006

2 Analysis of RDS Network Fig.: RDS circuit Assumed diode method -  It is partly graphical and partly analytical method. Steps involved – 1)Determine v o – v i relation for all the 2 n possible states of diodes. 2)Plot these straight lines.

3 Fig. : Plot of straight line relations 3) Find diode states corresponding to large –ve input (L state) and +ve input (R state). 4) Find the leftmost crossing point ( C 1 ). 5) Repeat until all crossing points are exhausted.  Number of calculation steps (CSs) are, = = 39

4 Break point method – Steps involved – 1)Assuming one of the diode at its break point, confirm the remaining diode states. 2)Repeat step 1 for all the remaining diodes. 3)Find the left most (L) and right most (R) states. 4) Plot v 0 – v i curves.  Number of CSs are, = = 82

5 Sequential Break point method – Steps involved – 1)Determine the leftmost state (L) and rightmost state (R). 2) Find the fictitious break voltages – FBVs (v i s) in L state. 3) Identify the minimum FBV.

6 4) Continue this process till R state is arrived. 5) Join all the break points. State (FBV) D1D2D3D4D5Break- points No. of CSs. L0 (-15) 0 (0) 1 (5) 0 (10) 1 (10) (-15, -12) (0) 1 (5.8) 0 (5) 1 (10) (0, 0) (3.58, 3.58) (5.92, 4.99) (6.71, 5.37)4+1 R Total CSs =26+2

7 Fig.: Transfer characteristic.  Total number of CSs are, N 3 (28) < N 1 (39) < N 2 (82)

8 Flow chart for the analysis and fault diagnosis of RDS network for CUT for sample circuit for fault- detection for sample circuit

9 Test circuit Fault dictionary X axis → 1cm=1V Y axis → 1cm=1V

10 THANK YOU