Phase-Locked Loops

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What should the gain b e ? Drive it with a 1kHz sine wave (1V pp, say), and see what comes out. Then t r y it with a 12k, or I 1k, resistor instead of 15k. ) Note that interchanging the two op-amp inputs also resuits in a -10k synthesis. 5. Negative impedance converter. stable only for driving impedances less than 10k. You might enjoy wiring up the other variety, then driving it with a variable voltage source (of a few volts dc) while measuring the input current. What do you expect, given that the input t o this N l C should behave exactly like a -1Ok resistor?

Begin by reducing R t o a few thousand ohms, t o bring a) the transistor into good saturation; at this point IC = 15mA. Measure VC (the "Darlington saturation voltage" and VB of Qi ("Darlington V B E " ) - tiow do they compare with typical single-transistor values? ) Explain. b) Increase R into the range of 500k-10Meg,,in order t o get IC down t o a few milliamps. Measure ~ F Eat collector currents around I m A and 10mA (as earlier, measure Ic, but calculate I B from R). 6 - 2 . Superbeta. 76 of the t e x t ?

Check it out. I s the signal's phase inverted? , i t s resting voltage) right? How about the amplifier's low frequency -3dB point? What should the output impedance be? Check it by comecting a resistive load, with blocking capacitor. e p 12, 4-9. Emitter Follower - Buffer. Hook an NPN emitter follower t o the previous amplifier. Think carefully about coupling and bias. Use a I k emitter resistor. QS di - Measure output impedance again, using a small signal. I s the overall amplifier gain affected by the addition of the emitter follower?

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