diff --git a/chamsin/src/analogic/ChoiceParameter.h b/chamsin/src/analogic/ChoiceParameter.h
new file mode 100644
index 00000000..87905f80
--- /dev/null
+++ b/chamsin/src/analogic/ChoiceParameter.h
@@ -0,0 +1,21 @@
+#ifndef CHOICEPARAMETER_H
+#define CHOICEPARAMETER_H
+
+#include "DeviceParameter.h"
+
+class ChoiceParameter : public DeviceParameter {
+    public:
+        typedef vector<string> Choices;
+        ChoiceParameter(string id, Choices& choices, unsigned value):
+            DeviceParameter(id), _choices(), _value(value) {
+            if (_value > choices.size()) {
+                throw Error("");
+            }
+        }
+    private:
+        Choices _choices;
+        unsigned _value;
+
+};
+
+#endif // CHOICEPARAMETER_H
diff --git a/chamsin/src/analogic/Device.cpp b/chamsin/src/analogic/Device.cpp
new file mode 100644
index 00000000..4c6bc969
--- /dev/null
+++ b/chamsin/src/analogic/Device.cpp
@@ -0,0 +1 @@
+#include "Device.h"
diff --git a/chamsin/src/analogic/Device.h b/chamsin/src/analogic/Device.h
new file mode 100644
index 00000000..526c2178
--- /dev/null
+++ b/chamsin/src/analogic/Device.h
@@ -0,0 +1,27 @@
+#ifndef DEVICE_H
+#define DEVICE_H
+
+#include "DeviceParameter.h"
+#include "hurricane/Cell.h"
+
+class Device : public Cell {
+    public:
+        struct DeviceParameterCompare:
+            public std::binary_function<const DeviceParameter&, const DeviceParameter&, bool> {
+                bool operator()(const DeviceParameter& dp1, const DeviceParameter& dp2) const {   
+                    return dp1._id < dp2._id;
+                }
+            };
+        typedef set<DeviceParameter, DeviceParameterCompare> DeviceParameterSet;
+        DeviceParameter& getParameter(const string& parameterId) const;
+    protected:
+        Device(Library* library, const Name& name): Cell(library, name) {}
+        void addParameter(const DeviceParameter& deviceParameter) {
+            _parameterSet.insert(deviceParameter);
+        }
+    private:
+        DeviceParameterSet _parameterSet;
+        
+};
+
+#endif // DEVICE_H
diff --git a/chamsin/src/analogic/DeviceParameter.h b/chamsin/src/analogic/DeviceParameter.h
new file mode 100644
index 00000000..0181ae91
--- /dev/null
+++ b/chamsin/src/analogic/DeviceParameter.h
@@ -0,0 +1,13 @@
+#ifndef DEVICEPARAMETER_H
+#define DEVICEPARAMETER_H
+
+class DeviceParameter {
+    public:
+        const string _id;
+        string _getString() const;
+        Record* _getRecord() const;
+    protected:
+        DeviceParameter(string id): _id(id) {}
+};
+
+#endif // DEVICEPARAMETER_H
diff --git a/chamsin/src/analogic/StepParameter.h b/chamsin/src/analogic/StepParameter.h
new file mode 100644
index 00000000..d2b76cde
--- /dev/null
+++ b/chamsin/src/analogic/StepParameter.h
@@ -0,0 +1,24 @@
+#ifndef STEPPARAMETER_H
+#define STEPPARAMETER_H
+
+template <Type>
+class StepParameter : public DeviceParameter {
+    public:
+        StepParameter(Type min, Type max, Type step):
+            _min(min), _max(max), _step(step) {} 
+        Type getMin() const { return _min; }
+        Type getMax() const { return _max, }
+        Type getStep() const { return _step; }
+        Type getValue() const { return _value, }
+        void setValue(Type value);
+
+    private:
+        Type _min;
+        Type _max;
+        Type _step;
+        Type _value;
+};
+
+typedef StepParameter<int> StepIntParameter;
+
+#endif // STEPPARAMETER_H
diff --git a/chamsin/src/analogic/Transistor.cpp b/chamsin/src/analogic/Transistor.cpp
index 2fbd0b61..ae0cacaf 100644
--- a/chamsin/src/analogic/Transistor.cpp
+++ b/chamsin/src/analogic/Transistor.cpp
@@ -6,6 +6,7 @@ using namespace Hurricane;
 
 #include "AEnv.h"
 #include "ATechnology.h"
+#include "ChoiceParameter.h"
 #include "Transistor.h"
 
 namespace {
@@ -85,7 +86,7 @@ Record* Transistor::AbutmentType::_getRecord() const {
 Transistor::Transistor(Library* library, const Name& name,
         const Polarity& polarity, DbU::Unit l, DbU::Unit w,
         const AbutmentType& abutmentType):
-    Cell(library, name),
+    Device(library, name),
     _drain(NULL),
     _source(NULL),
     _grid(NULL),
@@ -115,6 +116,12 @@ Transistor* Transistor::create(Library* library, const Name& name,
 
 void Transistor::_postCreate() {
    Inherit::_postCreate();
+
+   ChoiceParameter::Choices choices;
+   choices.push_back(string("N"));
+   choices.push_back(string("P"));
+   addParameter(ChoiceParameter("polarity", choices, 0));
+
    DataBase* db = DataBase::getDB();
    Technology* technology = db->getTechnology();
    _drain = Net::create(this, DrainName);
diff --git a/chamsin/src/analogic/Transistor.h b/chamsin/src/analogic/Transistor.h
index 36a099c3..a4e9abed 100644
--- a/chamsin/src/analogic/Transistor.h
+++ b/chamsin/src/analogic/Transistor.h
@@ -2,12 +2,13 @@
 #define TRANSISTOR_H
 
 #include "hurricane/Name.h"
-#include "hurricane/Cell.h"
 using namespace Hurricane;
 
+#include "Device.h"
+
 namespace Hurricane {
 
-class Transistor : public Cell {
+class Transistor : public Device {
     public:
         class Polarity {
             public: