| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a general-purpose LVPECL-IC is difficult to downsize and is expensive when it is so constructed as to be in an enabled mode while the E/D control voltage level is high, because it is necessary to customize the LVPECL-IC or to take measures such as connection of an inverter circuit by a differential amplifier or the like in the previous stage of an E/D circuit terminal. SOLUTION: The bases of transistors Q1 and Q2 are connected and the emitter of the transistor Q1 and the collector of the transistor Q2 are connected. The E/D control voltage of the system is divided by a series circuit of a resistor R1 and a parallel circuit between a resistor R2 and a diode D1, and the divided control voltage is applied to the bases of the transistors Q1 and Q2. The output voltage of the polarity opposite to the E/D control voltage of the system is taken from the connecting point between the emitter of the transistor Q1 and the collector of the transistor Q2. In this way, by connecting the inverter circuit with the E/D control circuit of the LVPECL, an extremely small and low-cost E/D control circuit can be provided. COPYRIGHT: (C)2005,JPO&NCIPI
|
