The CS CG combination is called a cascode amplifier.
2.
Adding this yields the cascode configuration.
3.
Because the input impedance of the common-gate amplifier is very low, the cascode amplifier often is used instead.
4.
Adding the lower FET results in a high input impedance, allowing the cascode stage to be driven by a high impedance source.
5.
Other CMOS circuit families within integrated circuits include cascode voltage switch logic ( CVSL ) and pass transistor logic ( PTL ) of various sorts.
6.
For example, a common base may be used as a current buffer at the output of a common emitter stage, forming a cascode.
7.
A practical solution to this low-input-impedance problem is to place a common emitter stage at the input to form a cascode amplifier.
8.
The combination of these two form the cascode configuration, which possesses several of the benefits of each configuration, such as high input impedance and isolation.
9.
Figure 1 shows an example of a cascode amplifier with a common source amplifier as the input stage driven by a signal source, " V " in.
10.
At 200 MHz, a noise figure of 2.5 ( or 4 dB ) can be reached with the ECC2000 tube in an optimized " cascode "-circuit with an optimized source impedance.
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