| 摘要 |
A frequency discriminator circuit suitable for fabrication in a semiconductor integrated circuit has an input terminal connected to an input amplifier for producing two signals of opposite phase which are, respectively, applied to the base electrodes of two common-collector connected transistors. One of the two signals is also applied through a phase shifter to the emitters of both transistors. An output differential amplifier has its inputs connected, respectively, to the emitters of the two transistors to produce a frequency-discriminated output signal.
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