cascode
Sign in to saveThe cascode is a two-stage amplifier that consists of a common emitter stage feeding into a common base stage when using bipolar junction transistors (BJTs)
Article
15 sectionsContents
- History
- Operation
- Stability
- Biasing
- Advantages
- Disadvantages
- Dual-gate version
- Mixer in superheterodyne receivers
- Other applications
- Two-port parameters
- BJT cascode: low-frequency small-signal parameters
- MOSFET cascode: low-frequency small-signal parameters
- Low-frequency design
- High-frequency design
- References
The cascode is a two-stage amplifier that consists of a common emitter stage feeding into a common base stage when using bipolar junction transistors (BJTs) or alternatively a common source stage feeding a common gate stage when using field-effect transistors (FETs).
Because there is no direct coupling from the output to input, the Miller effect is eliminated, contributing to a much higher bandwidth. Compared to a single amplifier stage, this combination may have one or more of the following characteristics: higher input–output isolation, higher input impedance, high output impedance, higher bandwidth.