Tag - Amplifier

Junction Field Effect Transistors. Source Follower Amplifier

Junction Field Effect Transistors. Source Follower Amplifier As mentioned in Lecture 16, there are two major families of transistors. We’ve worked with BJTs in the past few lectures. The second transistor type we will consider is the field effect transistor (FET). In the NorCal 40A, [...]

Common Emitter Amplifier Maximum Efficiency of Class A Amplifiers

Common Emitter Amplifier Maximum Efficiency of Class A Amplifiers Transformer Coupled Loads We discussed using transistors as switches in the last lecture. Amplifiers are another extremely important use for transistors. Two types of transistor amplifiers are used in the NorCal 40A: 1. Linear amplifier – Called [...]

Common Source Amplifier with Source Degeneration

Common Source Amplifier with Source Degeneration. The small-signal amplification performance of the CS amplifier discussed in the previous lecture can be improved by including a series resistance in the source circuit. (This is very similar – if not identical – to the effect of adding [...]

Common Source Amplifier

Common Source Amplifier. We’ve studied MOSFET small-signal equivalent models and the biasing of MOSFET amplifiers in the previous three lectures. We’ll now apply those skills by looking closely at three basic MOSFET amplifier types: 1. Common source amplifiers, including configurations with a source resistor (called source [...]

MOSFET Small-Signal Amplifier Examples

MOSFET Small-Signal Amplifier Examples. We will illustrate the analysis of small-signal MOSFET amplifiers through two examples in this lecture. Example N29.1 (text example 4.10). Determine Av (neglecting the effects of RG), Rin, and Rout for the circuit below given that Vt=1.5V,KaW|L=0.25 MA /V2, and VA=50 V The first [...]

MOSFET as an Amplifier. Small-Signal Equivalent Circuit Models

As with the BJT, we can use MOSFETs as AC small-signal amplifiers. An example is the so-called conceptual MOSFET amplifier shown in This is only a “conceptual” amplifier for two primary reasons: 1. The bias with VGS is impractical. (Will consider others later.) 2. In ICs, resistors [...]

Common Collector Emitter Follower Amplifier

The third, and final, small-signal BJT amplifier we will consider is the common collector amplifier shown below: The small-signal equivalent circuit is shown in We’ve included ro in this model since it can have an appreciable effect on the operation of this amplifier. Notice that ro [...]