diodecircuitsapplications-資料下載頁
【導讀】DiodeCircuits:. Applications. Applications–RectifierCircuits. Applications–RectifierCircuits. Large. Capacitance. i=dq/dtorQ=ILT. Q=VrC. then. C~(ILT)/Vr. Large. Capacitance. Forwardbias. Start. VrPeak-to-peak. riplevoltage. i=dq/dtorQ=ILT. Q=VrC. then. C~(ILT)/Vr. typically:VL~Vm-(Vr/2). Thesourcesare. outofphase. Batteriesreplaced. byZenerdiodes. Reviewexamples:. +600. mV. Iflow. below. 600. mV. Iflow. Above. 600. mV. -600. mV. until+600mVisreached,then. flowsthrutheDiode.Voltage. divider. Circuits(1). Circuits(1). THEN. Forsmallchanges. D. QD. D. Dvdv. dii?Forsmallchanges. D. QD. D. Dvdv. dii?1?QD. D. Ddv. dir. D. D. Dr. vi???q. kT. V. nV. v. Ii. T. T. d. sD. T. D. T. S. D. D. nV. v. nVIdv. diexp1. DQ. T. DI. nVr?T. DQ. sDQnV. vIIexp~where. DCcontrolsignal. C1,C2–smallorlarge?Cindccircuit–opencircuit. Cinaccircuit–shortcircuit
【正文】 x p1… and following the math on we can write that dynamic resistance of the diode is DQTD InVr ?Linear Small Signal Equivalent Circuits (3) ????????TDQsDQ nVvII e x p~where Example VoltageControlled Attenuator DC control signal C1, C2 – small or large ? C in dc circuit – open circuit C in ac circuit –short circuit Find the operating point and perform the small signal analysis to obtain the small signal voltage gain CjZ C ?1?Example VoltageControlled Attenuator DC control signal Dc circuit for Q point (IDQ, VDQ) DQTD InVr ?Compute at the Q point (IDQ, VDQ) Example VoltageControlled Attenuator The dc voltage source is equivalent to a short circuit for ac signals. Voltage gain RRRvvAppinv ???
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