eldo_user

Examples
Example 5—Transient Analysis of a Colpitts Oscillator
Figure 21-10. Colpitts Oscillator
Summary of Eldo commands used in this example:
• .MODEL—Model definition.
• .OPTION—Simulator configuration.
• .TRAN—Transient analysis.
• .PLOT—Plot simulator results.
Netlist Explanation
.model ts2 npn
+ bf=10 br=1 xtb=3 is=10f eg=1.11 rb=100
+ rc=10 vaf=50 tr=6n mjc=0.75 mje=0.33 vje=0.75
The above lines describe the electrical parameters of the npn bipolar transistor model ts2.
Tip
For a detailed description of each of these parameters, refer to the “BJT Model Syntax” in
the Eldo Reference Manual.
L1 1 3 5u
C1 1 2 2n
C2 2 3 100p
R3 2 4 2200
Q1 3 0 2 ts2
The above line defines a transistor q1 between nodes 3, 0 and 2 with electrical parameters
defined by the model ts2.
V1 1 0 5
V2 4 0 -5
1284
Eldo® User's Manual, 15.3