Editing Diode–transistor logic (section)

{{Short description|Class of digital circuits}}
{{redirect|DTL}}

[[Image:DTL NAND Gate.svg|frame|Schematic of basic two-input DTL NAND gate. R3, R4 and V− shift the positive output voltage of the input DL stage below the ground (to cut off the transistor at low input voltage).]]

'''Diode–transistor logic''' ('''DTL''') is a class of [[digital circuit]]s that is the direct ancestor of [[transistor–transistor logic]]. It is called so because the [[Logic gate|logic gating]] functions [[And (logic)|AND]] and [[Or (logic)|OR]] are performed by [[diode logic]], while [[Inverter (logic gate)|logical inversion (NOT)]] and [[Amplifier|amplification]] (providing signal restoration) is performed by a [[transistor]] (in contrast with [[resistor–transistor logic]] (RTL) and [[transistor–transistor logic]] (TTL).