Multi-Stage Amplifier Configurations

What happens when non-ideal amplifiers are put in series?

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What is the gain with two stages of gain A1 and A2 in series assuming RL = 1 MΩ?

• A1*A2

• A1+A2

• A1-A2

• A1/A2

What is the effect of inter-stage loading in DC-coupled multistage cascaded CE amplifiers?

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What is the advantage of using complementary devices in amplifier stages?

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What is the impact of using AC-coupled Common Emitter stages?

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Design a Complementary Pair amplifier stage using 2N3904 and 2N3906 transistors (β =120, VBE =0.7v). Use a supply voltage of 10v and a source resistance of 15 KΩ. Estimate the DC bias voltages and currents, and compare these with the results of a computer simulation. Determine the small signal gain for a nominal 1 KHz signal.

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The cascode is a two-stage amplifier composed of a single transconductance amplifier (usually a common source/emitter stage) followed by a current follower (usually a common gate/base stage). Compared to a single amplifier stage, this combination may have one or more of the following advantages: higher input-output isolation, higher input impedance, higher output impedance, higher gain or higher bandwidth.

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If the cascode device stage were operated alone using its emitter or source as input node (i.e. common base/gate configuration), it would have good voltage gain and wide bandwidth. However, its low input impedance would limit its usefulness to very low-impedance voltage drivers.

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Let us suppose that I need to build an amplifier that operates from a 100v power supply, however, the available transistors have a collector-to-emitter breakdown voltage (BVCEO) of only 25 volts. A cascode or a series of cascodes may also be combined with a voltage ladder to form a high-voltage transistor.

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The Folded Cascode biasing techniques.

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