Merits and demerits of collector-to-base bias, Electrical Engineering

Assignment Help:

Merits and Demerits of Collector-to-base bias:

Merits:

In this type of circuit the circuit stabilizes the operating point against differences in temperature and β (that is replacement of transistor)

Demerits:

In this type of circuit, to keep Ic independent of β, the subsequent condition must be met:

Ic = βIb = β(Vcc - Vbe)/ Rb + Rc + βRc ≈ (Vcc - Vbe) / Rc

This is the case while

βRc >> Rb

As β-value is set (and usually not known) for a given transistor, this relation can be satisfied either through keeping Rc fairly large or making Rb very low.

If Rc is large, a high Vcc is essential that increases cost also precautions are essential while handling.

The reverse bias of the collector-base region is small If Rb is low that limits the range of collector voltage swing which leaves the transistor in active mode.

The resistor Rb causes an AC feedback, decreasing the voltage gain of the amplifier. This not desirable effect is a trade-off for greater Q-point stability.


Related Discussions:- Merits and demerits of collector-to-base bias

Two-level system - princeton, Conceive a system composed of a very large nu...

Conceive a system composed of a very large number N of distinguishable atoms at rest and mutually noninteracting, each of which has only two (nondegenerate) energy levels:0,ε>0 Let

Determine the current and voltage for n-channel jfet, Q. An n-channel JFET ...

Q. An n-channel JFET with A = 300 V, P = 2 V, and I DSS = 10 mA is to be operated in the active mode. Determine i D when v DS = 10 V and v GS =-0.5V.

Show dc generator characteristics, Q. Show DC Generator Characteristics? ...

Q. Show DC Generator Characteristics? Figure shows schematic diagrams of field-circuit connections for dc machines without including commutating pole or compensating windings.

Explain sahf instructions in 8086 family, Explain SAHF instructions in 80...

Explain SAHF instructions in 8086 family with example and their effect on flag. SAHF: Store AH register in flag register, this is an instruction utilized to store the data i

Fourier deries, how to compute the fourier series expansion of a rectangula...

how to compute the fourier series expansion of a rectangular pulse train

Atomic structure, State the postulates of Bohr''s atomic model. Write any ...

State the postulates of Bohr''s atomic model. Write any three merits and demerits.

Cost and profitability - proposed kpis, Cost and Profitability - Proposed K...

Cost and Profitability - Proposed KPIs  KPI  UOM  Measures   RepresentativeStandards  Aggregate Technical &  Commercial L

Explain circuit with capacitive load, Circuit with capacitive load Capa...

Circuit with capacitive load Capacitors which obey the relationship of equation are linear capacitors, since the potential difference among the conductive surfaces is linearly

Differential amplifier to eliminate the common-mode voltage, Q. Differentia...

Q. Differential amplifier to eliminate the common-mode voltage? The transducer in some cases may have a local ground that cannot be disconnected. In such a case, a separate gro

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd