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Transistor vlves 1) Circuit equivalent of a BJT to the vlves: It is obtained easy from the
2) Nomenclature of the pedici of the hybrid parameters in the model of the transistor: 1ª the letter characterizes the physical truth that stà analyzing itself, it can be one of following: = input the r = reverse f = forward or = output 2ª the letter characterizes the configuration of the transistor to which it refers to us: b = base comune c = collector comune common emettitore and =
3) hIE :
4) hking :
5) hfe :
6) hoe :
7) Variation of the hybrid parameters: They can vary with the temperature, with the job point and with the frequency, pack-saddles to think that the hybrid parameters can be gain you from the characteristic curves, the supplied values are in kind reported to the ambient temperature and the frequency of 1khz.
8) Amplification in current for the configuration to common emettitore: Replacing
9) Resistance of income for the configuration to common emettitore: Replacing 500 typical values areW £ R the £ 1000W .
10) Amplification in tension for the configuration to common emettitore: The expression of Tov in function of i hybrid parameters can be determined in following the two ways: to) b) one gainsthe b from it is observed moreover that Tov andi they have opposite sign.
11) Resistance of escape for the configuration to common emettitore: It is necessary to cortocircuitare the generator of
tension vs and to remove RL , to the income mesh the equation is
had
12) typical Values of the amplification in current for the 3 configurations of the transistor: COMMON EMETTITORE: 30 ¸ 100 BASE COMMON : 0,93 ¸ 0.99 COMMON COLLECTOR: 30 ¸ 100
13) typical Values of the resistance of R income for the 3 configurations of the transistor: COMMON EMETTITORE: 500 ¸ 1000 BASE COMMON : 50 ¸ 200 COMMON COLLECTOR: 20K ¸ 100K
14) typical Values of the amplification in tension for the 3 configurations of the transistor: COMMON EMETTITORE: 300 ¸ 600 BASE COMMON : 500 ¸ 800 COMMON COLLECTOR: 0.95 ¸ 0.95
15) typical Values of the resistance of R escapeor for the 3 configurations of the transistor: COMMON EMETTITORE: 50K BASE COMMON : 300K COMMON COLLECTOR: 500
16) Model to hybrid parameters reduced and conditions of validity: In short they eliminate from the equivalent outline the generator of tension in income in how much hking @ 10-4 is negligible, as also the resistance mails in parallel to escape 1/hoe @ 10-5 .
17) Theorem of Thevenin: Whichever linear net to 2 clips can be replaced from a generator of tension of equal value to the tension to empty between the two clips in series with the stiffness of escape seen from that door.
18) Theorem of Norton: Whichever linear net to 2 finishes them can be replaced from a generator of current of equal value alla current short parallel circuit on the credit side stiffness of escape seen from those clips.
19) Corollario of the theorem of Thevenin and Norton: The value of the stiffness between two points of a circuit is equal to the relationship between the empty tension to between those two points and the current short circuit.
20) Theorem of Miller: If the relationship between the tensions in two various
points 1 is famous and 2 of a circuit then the Z' resistance can be
replaced mails between 1 and 2 with two resistances, one between 1 and
mass of
21) Duale of the theorem of Miller: If a quadripolo is had in which a node is towards mass
through a Z' resistance which is common to two distinguished meshes,
then it can be removed the resistance towards mass and be put of
others two, one on the node the 1 of value
22) Circuit to high stiffness of income with bootstrapping: The configuration to common emettitore with resistance of
emettitore bypassata from condenser Cand does not introduce a stiffness of
23) hybrid Parameters of the Darlington logon:
24) Analysis of the â?emitter followerâ? of Darlington type: The external parameters come calculate to you considering the Darlington as an only having transistor the hybrid parameters previously calculates to you and replacing in the outline the hybrid circuit equivalent of the same one.
25) Analysis simplified of the â?emitter followerâ? of Darlington type:
R0
is gained remembering that the resistance of escape of single a
pursuer is
26) Darlington Logon with bootstrapping: It is necessary to consider that to Q1 collector current is demanded one much lowland and
therefore the current is not more negligible that gives the base goes
towards the collector, this determines that the is not more
negligible |