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This is a dual-phase driver for diode-diode logic (D/2/L) technology and provides full fan-out of ten drive capability at both outputs and either three- or four-way AND logic inputs.
English (United States)
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Dual Phase Driver
This is a dual-phase driver for diode-diode logic (D/2/L) technology and
provides full fan-out of ten drive capability at both outputs and either three- or
four-way AND logic inputs.
The input is received at Schottky barrier diodes D1, D2 and D3. Emitter
follower connected transistor T1 drives through level shift diode D4 into the
cascode circuit including transistors T2 and T4. Base current is switched
between transistors T2 and T3 to produce a dual-phase output. Low forward
Schottky barrier diode D6 limits the down level at the collector of T2 to
approximately -1.3 volts. Similarly, high forward Schottky barrier diode D7 limits
the down level at the collector of T3. Schottky barrier diodes D5 and D8 prevent
saturation in transistors T4 and T1, respectively. Resistors R1-R6 are connected
and utilized in their conventional manner.
By way of example, an up level at all the inputs causes T1 to turn on, thereby
providing base drive to transistor T4, which also turns on. This causes transistor
T2 to turn on so that its collector provides a down-level output. When T2 is on,
T3 is turned off, providing an up-level output at its collector. If any of the inputs
at diodes D1, D2, and D3 are at a down level, the opposite phase output is
provided at the collectors of transistors T2 and T3.
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