Lecture (09) The JFET (2)
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1 Lecture (09) The JFET (2) By: r. Ahmed Elhafee ١ V Controls I connect a bias voltage, V V is set to increasingly more negative values by adjusting V, a family of drain characteristic curves is produced. I decreases as the magnitude of V is increased to larger negative values because of the narrowing of the channel ٢
2 for each increase in V, the JFET reaches pinch off (where constant current begins) at values of V less than VP. ٣ Cutoff Voltage The value of V that makes I approximately zero is the cutoff voltage, V(off), ٤
3 ٥ for an n channel JFET, the more negative V is, the smaller I becomes in the active region. When V has a sufficiently large negative value, I is reduced to zero. This cutoff effect is caused by the widening of the depletion region to a point where it completely closes the channel ٦
4 Comparison of Pinch Off Voltage and Cutoff Voltage The pinch off voltage VP is the value of V at which the drain current becomes constant and equal to I and is always measured at V = 0 V. pinch off occurs for V values less than VP when V is nonzero. although VP is a constant, the minimum value of V at which I becomes constant varies with V. ٧ V(off) and VP are always equal in magnitude but opposite in sign. A datasheet usually will give either V(off) or VP, but not both. However, when you know one, you have the other. For example, if V(off) = 5 V, then VP = +5 V ٨
5 Example 01 ٩ olution 1 ١٠
6 JFET Universal Transfer Characteristic range of V values from zero to V(off) controls the amount of drain current. For an n channel JFET, V(off) is negative, and for a p channel JFET, V(off) is positive. V does control I, the relationship between them is very important. general transfer characteristic curve (transconductance curve) is relationship between V and I ١١ ١٢
7 drain characteristic curves, plotting values of I for the values of V Each point on the transfer characteristic curve corresponds to specific values of V and I on the drain curves. ١٣ ١٤
8 A JFET transfer characteristic curve is expressed approximately as ١٥ Example 02 ١٦
9 ١٧ ١٨
10 ١٩ JFET Forward Transconductance The forward transconductance (transfer conductance), gm, is the change in drain current ΔI for a given change in gate tosource voltage ΔV. It is expressed as a ratio and has the unit of siemens (). ٢٠
11 transfer characteristic curve for a JFET is nonlinear, gm is greater near the top of the curve (near V = 0) than it is near the bottom (near V(off)) datasheet normally gives the value of gm measured at V = 0 V (gm0). iven gm0, you can calculate an approximate value for gm at any point on the transfer characteristic curve using the following formula: ٢١ When a value of gm0 is not available, you can calculate it using values of I and V(off ). ٢٢
12 Example 04 ٢٣ olution 4 ٢٤
13 Input Resistance and Capacitance JFET operates with its gate source junction reverse biased, which makes the input resistance at the gate very high. high input resistance is one advantage of the JFET over the BJT. JFET datasheets often specify the input resistance by giving a value for the gate reverse current, I, at a certain gate to source voltage. ٢٥ ٢٦
14 ٢٧ ٢٨
15 Example 05 ٢٩ Answer 05 ٣٠
16 AC rain to ource Resistance above pinch off, the drain current is relatively constant over a range of drain to source voltages. a large change in V produces only a very small change in I. The ratio of these changes is the ac drain to-source resistance of the device, ٣١ Thanks,.. ee you next week (IA), ٣٢
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