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The use of a cascode (sometimes verbified to cascoding) is a common technique for improving analog circuit performance, applicable to both vacuum tubes and transistors.The name "cascode" was coined in an article written by Frederick Vinton Hunt and Roger Wayne Hickman in 1939, in a discussion on the application of voltage stabilizers. [3]
Figure 1: Basic N-channel JFET common-source circuit (neglecting biasing details). Figure 2: Basic N-channel JFET common-source circuit with source degeneration. In electronics, a common-source amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage or transconductance amplifier.
Cascode Voltage Switch Logic (CVSL) refers to a CMOS-type logic family which is designed for certain advantages. It requires mainly N-channel MOSFET transistors to implement the logic using true and complementary input signals, and also needs two P-channel transistors at the top to pull one of the outputs high.
In this circuit, the source terminal of the transistor serves as the input, the drain is the output, and the gate is connected to some DC biasing voltage (i.e. an AC ground), or "common," hence its name. The analogous bipolar junction transistor circuit is the common-base amplifier.
A cascode connection (common emitter stage followed by common base stage) is sometimes found. Audio power amplifiers will typically have a push-pull output as the final stage. A Darlington pair of transistors is another way of obtaining a high current gain. In this connection the emitter of the first transistor feeds the base of the second with ...
The advantage of this circuit is the output current is an ... one being that the linearity advantage of the top linearized cascode is minimal due to the near-square ...
For higher PM values, the circuit is more stable, but it takes longer for the output voltage to reach its final value. [1] [2] [3] In telescopic and FC amplifiers, the dominant pole is at the output nodes. Also, there is a non-dominant pole at the cascode node. [3]
The circuit is named after George R. Wilson, an integrated circuit design engineer who worked for Tektronix. [1] [2] Wilson devised this configuration in 1967 when he and Barrie Gilbert challenged each other to find an improved current mirror overnight that would use only three transistors. Wilson won the challenge. [3]