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ECE5325: Smart Sensor and Fuel Cell

Laboratory #1

SIMPLORER EnvironmentsObjectives:

To become familiar with Simplorer environments.

To conduct a mixed signal simulation

D Q

QB

Flip flop

ffd1

D Q

QB

Flip flop

ffd2

comp1sine1

Q=>BS

realqty_bitsig1

thres := 0.

val1 := 1

val2 := -1

thres :=ampl := 1

freq := 1.0

Figure 1. Mixed signal circuit to be constructed and tested.

* All the components shown in Figure 1 are available in the Simplorer library.

I. Invoke Simplorer, click on Create New Project, give the name of the project(enter the file

name, dont need to enter the project title), and click OK. Then click Schematics on left

panel.

II. Gather all the circuits components:

Sine source in basic_vhdlams>Tools>Time Functions>Sine Wave

Comparator in basic_vhdlams>Blocks>Signal Processing Blocks>Comparator

Real to Bit converter (Q=>BS) in Tools>Omnicasters>Quantity-Signal>Real-Bit

Flip-flop ffd in Digital>Flip-flops>D-Flip flop>Basic D-Flip flop

Ground [Schematic]Connect>GND.

III. Interconnect the components as shown in Figure 1, using WIRE command in

[Schematic]>Connect>Wire

Double click component whose parameter need to be set

Sine1: FREQ =1.0k AMPL=1

Comparator1: vthresh =0.0, val1=1, val2=-1

Realqty_bitsig1: thres=0.0

IV. Make the parameters visible by selecting Output/Display property and setting the parameter

Show property from No Display to Name:=Value. Position the component label and

parameters as shown in Figure 1.

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V. Set the simulation parameters. [Schematic]Simulation>Parameters In the dialog box,

determine the appropriate time for the following:

Simulation End Time[s]- Tend : ?

Minimum Time Steps [s] Hmin: ?

Maximum Time Step [s] Hmax: ?

So that the following wave form are obtained:

sine1.val1

-1

0

Sine1 output waveform

Note: the scaling factor of 1. In Simplorer, the source polarity is opposite of the SPICE convention.

comp1.val1.3

-1.3

0-0.5

Comparator output waveform

ffd1.q1.2

-0.2

0.4

FF1 output waveform

ffd2.q1.2

-0.2

0.4

0.8

FF2 output waveform

Homework (Due next lab meeting)

1. Display and examine the VHDL-AMS code of the Comparator and FF. Explain why do you

need the Real (QUANTITY) to bit (SIGNAL) converter.

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2. Display the code of the Q=>BS, to understand how the conversion is done.

REFERENCES

1. Simulation System SIMPLORER VHDL-AMS Tutorial, English Edition, 2003

Ansoft Corporation.

2. Simulation System SIMPLORER v.6.0 User Manual, English Edition, 1996-2002,

Ansoft Corporation.

3. Simulation System SIMPLORER 6.0 Getting Started, English Edition, 1996-2002,

Ansoft Corporation.

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