SaM - Current Amplifier

Remeber:

Operational amplifier:

• $\beta =\frac{R_1}{R_1+R_2}$
• $A=\frac{A_{DC}}{1+j\frac{f}{f_H}}$ Non inverting amplifier: $V_0=V_i\left(1+\frac{R_2}{R_1}\right)$

A current amplifier has this structure:
The output is:$V_{out}=R\cdot I_F$And $I_F$ is:$I_F=\frac{Z_N}{\frac{R}{A(f)}+Z_N}{I}_N$If $A_f$ is really big, as it usually is for DC signals, we find that:$I_F=I_N$

IMPORTANTE A current amplifier has this properties:

• Single pole (dominant pole) system.
• DC-coupled.
  It means that the amplifier is capable of amplifying signals with both DC (direct current) and AC (alternating current) components.
• Very low input impedance, very low output impedance.
  While a voltage amplifer has high input resistance.

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