SaM - Logarithmic Amplifier

Memory Card

---

• Online Source: Wikipedia:
  
• Formula: $V_{out}=-V_T\ln \left(\frac{V_{in}}{I_{S}R}\right)$Where:$V_T=\frac{KT}{q}$Form Wikipedia :$V_{BE}=V_T\cdot \ln \left(\frac{I_C}{I_S}\right)$And the BJT formula we found is:$V_{BE}=\frac{kT}{q}\ln \left(\frac{I_C}{I_S}\right)$
• Circuit (High negative inputs):
  
• Circuit (Low negative inputs, even reaching $0$):