| 摘要 |
An integrated circuit one shot circuit provides relatively long duration (hundreds of nanoseconds up to a millisecond) output pulses without the need for excessively large transistors. The one shot circuit includes a pull up and a pull down device connected to the one shot circuit's input terminal, with a latch connected to a node between the pull up and pull down devices. The output terminal of the latch is connected to the input of a Schmitt trigger. One terminal of a grounded capacitor is connected between the latch output terminal and the Schmitt trigger input. The output terminal of the Schmitt trigger is connected through an inverter to one input terminal of a NAND gate, the other input terminal of which is connected to the one shot circuit's input terminal. A feedback line connects the output terminal of the NAND gate to the gate of a depletion mode transistor which is between the pull up and pull down devices. This provides a glitch free long duration output pulse using conventional CMOS transistor fabrication technology in a large scale integrated circuit.
|
