Create app.py

app.py

@@ -0,0 +1,63 @@
+import streamlit as st
+import numpy as np
+import matplotlib.pyplot as plt
+import pandas as pd
+
+def calculate_output(vin):
+    v_ge = np.where(vin >= 0.3, 0.3, np.where(vin < 0, vin, 0))
+    v_o = np.where((vin >= 0.3) | (vin < 0), 0, 6)
+    return v_ge, v_o
+
+def main():
+    st.title("🇩🇪 Germanium Transistor Waveform Simulator")
+    st.caption("Analyze clipping behavior of Ge transistor (V_Ge = 0.3V) with 6V DC supply")
+
+    # User inputs
+    amplitude = st.slider("Input Amplitude (V)", 0, 15, 10)
+    time = np.linspace(0, 2*np.pi, 1000)
+
+    # Generate input waveform
+    vin = amplitude * np.sin(time)
+    
+    # Calculate outputs
+    v_ge, v_o = calculate_output(vin)
+
+    # Create table data
+    sample_points = [10,8,6,5,4,3,2,1,0.7,0.3,0,-0.3,-0.7,-1,-2,-3,-4,-5,-6,-8,-10]
+    table_data = []
+    for point in sample_points:
+        v_ge_val = 0.3 if point >= 0.3 else (point if point < 0 else 0)
+        v_o_val = 0 if (point >= 0.3 or point < 0) else 6
+        table_data.append([point, round(v_ge_val, 2), v_o_val])
+
+    # Display results
+    col1, col2 = st.columns(2)
+    
+    with col1:
+        st.subheader("Waveforms")
+        fig, ax = plt.subplots(figsize=(8, 4))
+        ax.plot(time, vin, label='Input (V_in)')
+        ax.plot(time, v_o, label='Output (V_o)', color='red')
+        ax.set_xlabel('Time')
+        ax.set_ylabel('Voltage (V)')
+        ax.legend()
+        ax.grid(True)
+        st.pyplot(fig)
+
+    with col2:
+        st.subheader("Data Table")
+        df = pd.DataFrame(table_data, columns=["V_in (V)", "V_Ge (V)", "V_o (V)"])
+        st.dataframe(df.style.format({"V_Ge": "{:.2f}", "V_o": "{:.0f}"}), height=600)
+
+    st.markdown("### Circuit Behavior Summary")
+    st.write("""
+    - **Positive Half Cycle (V_in ≥ 0):**
+        - Clipped to 0V when input ≥ 0.3V
+        - Output stays at 6V when input < 0.3V
+    - **Negative Half Cycle (V_in < 0):**
+        - Output always remains at 6V
+    - Germanium forward voltage (V_Ge) = 0.3V
+    """)
+
+if __name__ == "__main__":
+    main()