| 摘要 |
Disclosed is a level detector in use with a differential amplifier circuit in an amplitude-limiting amplifying system for angle-modulation signal amplification. The differential amplifier circuit is made up of differentially paired transistors. The level detector contains first and second transistors which form a differential pair. In the first transistor, the base is connected to an interjunction of the emitters of the differentially paired transistors. A second transistor is connected at the emitter to the emitter of the first transistor. A current source is connected to the emitter interjunction of the first and second transistors. A bias circuit applies a predetermined bias potential to the base of the second transistor. An output signal containing the detected level information of the input signal is derived from the collector of the first or second transistor. |
