Common: Collector Configuration | Analog and Digital Electronics - Electrical Engineering (EE) PDF Download

COMMON – COLLECTOR CONFIGURATION

 Also called emitter-follower (EF). It is called common-emitter configuration since both the signal source and the load share the collector terminal as a common connection point. The output voltage is obtained at the emitter terminal. The input characteristics of common-collector configuration is similar with common-emitter configuration.Common-collector circuit configuration is provided with the load resistor connected from the emitter to the ground. It is used primarily for impedance-matching purpose since it has high input impedance and low output impedance.

                               Common: Collector Configuration | Analog and Digital Electronics - Electrical Engineering (EE)

For the common-collector configuration, the output characteristics are a plot of Ivs VCE for a range of values of IB.

                                Common: Collector Configuration | Analog and Digital Electronics - Electrical Engineering (EE)

Limits of opearation:

Many BJT transistors are used as an amplifier. Thus it is important to notice the limits of operations. At least 3 maximum values are mentioned in the data sheet.

They are:

a) Maximum power dissipation at collector: PCmax or PD.

b) Maximum collector-emitter voltage: VCEmax sometimes named as VBR(CEO) or VCEO.

c) Maximum collector current: ICmax.

 

There are few rules which need to be followed for BJT transistor to be used as an amplifier. The rules are: The transistor must be operated in active region!

IC < ICmax 

PC < PCmax 

             Common: Collector Configuration | Analog and Digital Electronics - Electrical Engineering (EE)

 

 

Note:          VCE is at maximum and IC is at minimum (ICmax=ICEO) in the cutoff region. IC is at maximum and VCE is at minimum (VCEmax = VCESAT = VCEO) in the saturation region. The transistor operates in the active region between saturation and cutoff.

 

Common: Collector Configuration | Analog and Digital Electronics - Electrical Engineering (EE)

Refer to the fig. Example; A derating factor of 2mW/°C indicates the power dissipation is reduced 2mW each degree centigrade increase of temperature.  

Step1:

The maximum collector power dissipation,

PD=ICMAX x VCEmax= 18m x 20 = 360 mW

Step 2:

At any point on the characteristics the product of and must be equal to 360 mW.

Ex. 1. If choose ICmax= 5 mA, substitute into the (1), we get

VCEmaxICmax= 360 mW

VCEmax(5 m)=360/5=7.2 V

Ex.2. If choose VCEmax=18 V, substitute into (1), we get

VCEmaxICmax= 360 mW

(10) ICMAX=360m/18=20 mA 

Derating PDmax

PDMAX is usually specified at 25°C.

The higher temperature goes, the less is PDMAX

Example;A derating factor of 2mW/°C indicates the power dissipation is reduced 2mW each degree centigrade increase of temperature.

The document Common: Collector Configuration | Analog and Digital Electronics - Electrical Engineering (EE) is a part of the Electrical Engineering (EE) Course Analog and Digital Electronics.
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FAQs on Common: Collector Configuration - Analog and Digital Electronics - Electrical Engineering (EE)

1. What is a collector configuration in relation to data management?
Ans. A collector configuration refers to the setup or arrangement of data collectors, which are tools or systems used to gather and store data. It involves configuring the collectors to collect specific types of data from various sources and ensuring they are properly connected and functioning.
2. How does a collector configuration help in data collection and management?
Ans. A collector configuration plays a crucial role in data collection and management by providing a structured approach to gather and store data. It allows organizations to define data collection parameters, such as the frequency, sources, and types of data to be collected, making it easier to maintain data consistency and quality.
3. What are some common components of a collector configuration?
Ans. Common components of a collector configuration include data sources, which can be databases, APIs, or files, data collection schedules, data transformation rules, data storage locations, and data validation mechanisms. These components work together to ensure the smooth collection and management of data.
4. How can one optimize a collector configuration for efficient data collection?
Ans. To optimize a collector configuration, it is important to regularly review and update the data collection parameters based on changing business needs. This may involve adjusting the frequency of data collection, adding new data sources, or refining data transformation rules. Additionally, monitoring the performance of the collectors and addressing any issues promptly can help ensure efficient data collection.
5. Are there any best practices to consider when designing a collector configuration?
Ans. Yes, there are several best practices to consider when designing a collector configuration. These include clearly defining the data collection requirements, selecting reliable and scalable data collectors, implementing data validation checks, documenting the configuration setup, regularly monitoring and maintaining the collectors, and regularly reviewing and updating the configuration based on evolving data needs.
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