cascode

The same arrangement is widely used in cascode circuits as well.

The word cascode is a contraction of the phrase cascade to cathode.

The cascode arrangement is also very stable.

It is common to see these amplifiers installed in a cascode configuration, which improves the frequency response.

A cascode may also be combined with a voltage ladder to form a high-voltage transistor.

One trick is to add a common-gate (current-follower) stage to make a cascode circuit.

A modified version of the cascode can also be used as a modulator, particularly for amplitude modulation.

The cascode circuit requires two transistors and requires a relatively high supply voltage.

For example, a common base may be used as a current buffer at the output of a common emitter stage, forming a cascode.

Adding this yields the cascode configuration.

So, this arrangement can be considered as a cascode consisting of cascaded common-emitter and common-base stages.

The cascode improves input-output isolation (or reverse transmission) as there is no direct coupling from the output to input.

The cascode is a two-stage amplifier composed of a transconductance amplifier followed by a current buffer.

When the cathode potential is raised above ground (as in cascode circuits), bias voltage is obtained by tapping into main (positive) plate power supply.

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.

Both signals are multiplied by the mixer and the difference frequency, the Intermediate frequency is taken from the upper drain of the cascode mixer.

Thus, even sacrificing gain, the cascode produces the same gain as the single-transistor transconductance amplifier, but with wider bandwidth.

They proposed a cascode of two triodes (first one with common cathode, the second one with common grid) as a replacement for a pentode.

The figure shows the original cascode (Fig. 1) and the equivalent voltage amplifier or g-equivalent two-port (Fig. 4).

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.

Using a cascode configuration, which inserts a low input impedance current buffer (e.g. a common base amplifier) between the transistor's collector and the load.

The cascode arrangement offers high gain, high bandwidth, high slew rate, high stability, and high input impedance.

A dual-gate MOSFET often functions as a "one-transistor" cascode.

Adding the lower FET results in a high input impedance, allowing the cascode stage to be driven by a high impedance source.

For the two-FET cascode, both transistors must be biased with ample V in operation, imposing a lower limit on the supply voltage.