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Because of these nice properties, emit— ter followers find application in many situations, e. Consider the example in Figure 2. This can be very handy where high currents are involved e.

Bootstrapping collector load resistors The bootstrap principle can be used to in- crease the effective value of a transistor’s collector load resistor, if that stage drives a follower. Great things to look forward to in Chapters 4 and 5! The most age 9 af7512 thing is to be aware of the effect so that it doesn’t catch you by surprise.

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In particular, if the load is always connected e. A good differential amplifier has a high common— mode rejection ratio CMRRthe ratio of response for a normal-mode signal to the response for a common-mode signal of the same amplitude.

An alternative circuit splits the signal and dc paths Fig. It has only a single base-emitter drop, but it also cannot saturate to less than a diode drop. Because rule 4 holds only if rule 1 is obeyed; at a collector current of lOOmA the lamp has 10 volts across it. To get a higher current you would have to pull the collector below ground.

Wilson mirror Another current mirror with very constant current is shqvggeigk the clever circuit of Figure 2. Furthermore, the op- amp—assisted current sources we’ll see in the next chapter are better still.


D3 provides a diode drop so that Q1 is off with 51 or 5’2 closed, and D4 protects Q3 from the buzzer’s inductive turn—off transient. This means that the circuit re- quires less power from the signal source to drive a given load than would be the case if the signal source were to drive the ddatasheet directly. This simple zener—regulated supply is sometimes used for noncritical circuits, or circuits using little supply current.

Any advise or help I can pass on to the tech who is repairing my system would be greatly datashete. For this reason you seldom see FETs used as simple amplifiers, unless it’s important to take advantage of their unique input properties extremely high input resistance and low input current. Their TL series includes1: Small emitter resistors improve thermal stability in the push-pull follower.

By returning the emitter resistor to a negative supply voltage, you can permit negative voltage swings as well.

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The process of selecting the operating voltages in a circuit, in the absence of applied signals, is known as setticg the quiescent point. Important points about followers 1. However, it is safe to assume that the load impedance won’t be smaller than RE, which gives a value for 02 of at least 1. My old notes are handwritten and no serialnumbers are noted for this entry, so I cannot tell if I used it in an actual repair.

The measured curves of Figure 3. We thought of the transistor. The choice depends on xd7512 or not the amplifier is supposed to invert the signal. Two circuit configurations that avoid Miller effect.


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The point to un- derstand is that the FET amplifier doesn’t look like a ohm load at signal frequen- c1es. Let’s take a brief look. So the capacitor sees a load of about 63k, and it should have a value of at least 0. The voltage gain of an emitter follower is actually slightly less than 1.

Cascode current source for im- proved current stability with load voltage vari- ations. A small resistor from base to emitter of Q2 is advisable. IC designers use techniques like interdigitation two devices sharing the same general piece of IC real estate and thermal—gradient cancellation schemes to improve performance Fig. In Chapter 4 we will treat feedback in enough detail so that you will be able to figure the voltage gain and terminal impedance of this circuit.

An ac-coupled emitter follower. Before getting into more details, though, let’s look at two simple switching applications. So the resultant vector the output voltage always has unit length, i. The collector resistor is cho— sen to put the quiescent collector voltage at 0. Note that there is no collector resistor in an emitter follower.

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The same is true for the input capacitance in combination with the source impedance Rs. In electronic circuits, you’re always hooking the output of some— thing to the input of something else, as suggested in Figure 2. Use a current source in the emitter and an emitter follower output stage.