We can simplistically think of a multiplier transistor as being two separate items. If the input voltage swing exceeds the baseemitter forward voltage the junction starts to behave like a rectifier diode and distortion occurs. Principle of Operation If a transistor is used as an amplifier for a signal requiring linear amplification then it is limited to the output power it can produce because of the maximum voltage swing on the base or collector. If the transistor is operated in grounded emitter configuration with the input RF drive applied to the base the impedance is medium and a greater RF voltage swing can be obtained from relatively low drive power. Using an active device such as a transistor can overcome the inherent loss of the simple diode multiplier, because the transistor can have appreciable gain when used as a multiplier, which eases the design of multiplier chains where high multiplication is required. This makes them only useful for low orders of multiplication of perhaps 3 as a practical maximum. These all suffer from one serious disadvantage, the conversion loss when multiplying to high orders can be quite high. Introduction In a previous article we looked at the use of diode multipliers. During the course of the adventure, you will piece together the Transistor's mysteries as you pursue its former owners.1 John Fielding, ZS5JF Transistor Frequency Multipliers 1.

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