Analysis of Bipolar and CMOS Amplifiers by Amir M. Sodagar

By Amir M. Sodagar

The classical method of analog circuit research is a frightening prospect to many scholars, requiring tedious enumeration of contributing elements and long calculations. such a lot textbooks observe this bulky method of small-signal amplifiers, which turns into much more tough because the variety of elements raises. research of Bipolar and CMOS Amplifiers deals scholars another that permits speedy and intuitive research and layout: the analysis-by-inspection method.

This functional and student-friendly textual content demonstrates how one can in attaining approximate effects that fall inside of an appropriate diversity of accuracy and are in keeping with sound medical ideas. operating from the fundamentals of amplifiers and transistors to biasing, unmarried- and multistage amplifiers, present resources and mirrors, and research at midband, low, and excessive frequencies, the writer demonstrates the interrelationship among habit in either the time and frequency domain names and balances the dialogue among bipolar and CMOS circuits. each one bankruptcy closes with a collection of simulation examples in SPICE and MATLAB® that supply scholars hands-on event utilizing the recommendations and techniques utilizing industry-standard tools.

Building a pragmatic operating wisdom round a high-quality theoretical framework, research of Bipolar and CMOS Amplifiers prepares your scholars to fulfill the demanding situations of speedy and exact approximations and software-based research waiting for them within the office.

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Sample text

To do this, DC voltage and current sources are used to establish proper voltages and currents for the transistor to stay at certain points on its input and output characteristic curves, called operating points. This chapter introduces various approaches and circuit configurations for biasing a transistor in the proper mode for linear applications. 1(b)) and which implies applying proper voltages to the three terminals of the transistor. 12 all are expected to be positive. 1 IB VCE vCE (b) vBE characteristics (b) iC vCE characteristics.

In practice, electrical behavior of the channel is affected by the voltage across it, which is vDS. The physical phenomenon that causes this effect is known as channel-length modulation. Because of this phenomenon, the drain current in saturation mode proportionally follows the variations in the drainsource voltage. 9) where is the channel-length modulation parameter. This parameter is one of the specifications of an MOS transistor. 02 V 1. 9. )). ). 9 Adding the channel-length modulation effect to the iD transistor.

To better understand how to solve transistor circuits for their operating points, let us continue with the following examples. 3. Assuming that VCC = 5 V, RB = 430 k , and RC = 3 k , find the transistor’s operating point (IC, VCE). Solution: Finding a loop that passes two of the transistor’s terminals will result in a KVL* equation that contains at least one current and one voltage of the transistor. If the loop is chosen to pass the base and the emitter, the voltage variable will be vBE, which can be approximated to VBE (ON) with a given constant value.

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