Detector/Mixer

• Schottky diodes, PIN diodes, Varactor diodes.

              Now what makes a device high speed device?

Or

              Why do we need special device considerations at high frequency?

              Why cannot we use a BJT from a basic electronics lab, use it to make an amplifier at 10 GHz?

Why a special BJT?

Well let us look at a simple circuit

                                                                          Fig.1.1