| 摘要 |
A circuit which in one configuration may be used as a rectifier and in another configuration as a direct coupled product modulator comprising a pair of transistors coupled to the input, a first integrated circuit amplifier controlling the transistors and a second integrated circuit amplifier obtaining its input inverting input from one transistor and its non-inverting input from the other and providing the final output is shown. In the rectifier configuration the signal to be rectified is applied to both the two transistors and the first amplifier with the amplifier output selectively grounding a respective one of the transistors on respective positive and negative cycles causing the second amplifier to output a uni-polar signal. In the modulator configuration the carrier is applied to the first amplifier and will modulate the signal input to the transistors through similar grounding action. Both configurations are able to handle small signals and provide variable gain a feature not present in prior art devices using transformers.
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