| 摘要 |
A pair of transistors are each normally biased to saturation, one more strongly than the other. A tunnel diode connected between the collectors, respectively, produces an output voltage only when one of the transistors is driven out of saturation, but not when both transistors are non-saturated. Neither transistor is taken out of saturation until the signal pulse input reaches a certain predetermined amplitude. When the input pulse reaches a second predeterminde amplitude, both transistors are taken out of saturation. Thus, only pulses of amplitudes within a given range produce output signals. In an alternative embodiment, a single transistor replaces the tunnel diode. In another embodiment, the tunnel diode is replaced by a second differential pair of transistors.
|
