BJT DC Circuits I. In this Lecture, we will:  Discuss further the dc analysis and design techniques of bipolar transistor circuits.  Examine some basic.

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Presentation transcript:

BJT DC Circuits I

In this Lecture, we will:  Discuss further the dc analysis and design techniques of bipolar transistor circuits.  Examine some basic applications of bipolar transistor circuits.

DC Equivalent Circuit for npn Common Emitter

Load Line

Another Load Line Example (Example 5.10)

Problem-Solving Technique: Bipolar DC Analysis 1.Assume that the transistor is biased in forward active mode a.V BE = V BE (on), I B > 0, & I C = I B 2.Analyze ‘linear’ circuit. 3.Evaluate the resulting state of transistor. a.If V CE > V CE (sat), assumption is correct b.If I B < 0, transistor likely in cutoff c.If V CE < 0, transistor likely in saturation 4.If initial assumption is incorrect, make new assumption and return to Step 2.

Voltage Transfer Characteristic for npn Circuit

Voltage Transfer Characteristic for pnp Circuit

NPN Switch Driving a Load

BJT Switches Driving Loads

Digital Logic InverterNOR gate

Bipolar Inverter as Amplifier

Effect of Improper Biasing on Amplified Signal Waveform

Current Relationships in the Active Mode i E = (1+  )i B

Common-Base Configuration

Current-Voltage Characteristics of a Common-Base Circuit

Example Problem I

V + = 3.3V V - = -3.3V = 2.27V

Example Problem I

Example Problem II

Example Problem III