2.3.3.8 Voltage Controlled Current Source

Next: 2.3.3.9 Current Controlled Current Up: 2.3.3 Devices Previous: 2.3.3.7 Voltage Source

2.3.3.8 Voltage Controlled Current Source

**Figure 2.6:** Voltages and currents for controlled sources.
$\begin{figure} \begin{center} \resizebox{7.8cm}{!}{ \psfrag{IA}{$\scriptstyle I_... ...} \includegraphics[width=7.8cm,angle=0]{figures/cs.eps}}\end{center}\end{figure}$

The constitutive relation for a linear voltage controlled current source is given as I_out = g^.V_in with g being the transconductance of the device. This is the simplest of all controlled sources and the only one which can be properly modeled using the traditional NA. The terminal voltages and branch currents are shown in Fig. 2.6 and the stamp is given as

y_{x, y}	$\varphi_{1}^{}$	$\varphi_{2}^{}$	$\varphi_{3}^{}$	$\varphi_{4}^{}$	f
n₁
n₂
n₃	g	- g			I_out
n₄	- g	g			- I_out

The voltage controlled current source obviously degrades to an ideal conductor if n₁ = n₃ and n₂ = n₄.

Tibor Grasser
1999-05-31