| 摘要 |
<p>A circuit (42) which provides a threshold voltage (VT) to a single-ended operated diode load emitter coupled logic circuit (26) includes a transistor (44) having an emitter coupled to an output at which the threshold voltage is produced, a collector coupled to a positive supply conductor and a diode (46) coupled between the positive supply conductor and the base of the transistor A current source (48) is coupled to the emitter of the transistor which sinks a current that is equal to the "tail" current of the logic circuit. The magnitude of the threshold voltage produced is equal to a value that lies midway between the logic output voltage swing developed across the diode loads of the logic circuit. <IMAGE></p> |
