| 摘要 |
PURPOSE:To connect directly the titled circuit to a circuit of the next stage in the same IC chip by making a current flowing to a load resistor of a differen tial amplifier when an output of the differential amplifier goes off a half of a current when the output goes on. CONSTITUTION:Transistors (Trs) 5, 6 of a differential pair are connected in parallel and the collector of the Tr 5 is connected to a connecting point between a resistor R2 and a collector of a Tr 2. The point is used as an output and a resistor R8 is made equal to a resistor R1 so as to flow the same current to the Trs 5, 6 when a Tr 3 is turned off. In turning on/off a continuous bipolar signal inputted to a Tr 1 of the differential amplifier by using a digital signal inputted to the Tr 3 of the differential pair, when the digital signal is at an L level and the Tr 3 is turned off, the current flowing to the resistor R2 is a half of a current I' flowing to the resistor R2 when the Tr 3 is turned on and the output voltage is clamped to the center of the amplitude of the bipolar signal. Thus, no capacitor is required, the circuit integration is facilitated, no output signal is required and the titled circuit is connected directly to a circuit of the next stage. |
