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This circuit arrangement delivers a two-phase clock pulse train on demand in response to a logical control voltage level.
English (United States)
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Two Phase Clocking Wave Generating Circuit
This circuit arrangement delivers a two-phase clock pulse train on demand in
response to a logical control voltage level.
The circuit arrangement comprises a pair of flip-flop circuits
12, 14 connected as monostable flip-flop circuits having unstable
states determined by a series-resonant quartz crystal 15 as shown, or
by the value of a resistor 16 and a capacitor (not shown - connected
in place of the crystal) for one circuit 12 and another resistor 18
and a capacitor 19 for the other circuit 14. The respective pulse
widths are calculated by: T(w) = K R C (1 + 0.7 over R)
where: R is the value of the resistor in kilohms,
C is the value of the capacitor in picofarads,
K is a constant value 0.28, and
T(w) is the time in nanoseconds.
A crystal (as shown for the circuit 12) is substituted for the capacitor where
closer control is necessary. The series-resonant low impedance of the crystal
determines the time at which the flip-flop circuit returns to the stable state.
An AND gating circuit 20 has one input lead connected to the P (Q) output
terminal of the final flip-flop circuit 14 and another lead connected to a logic level
control signal terminal 22. An AND gating circuit with these two input leads is
sufficient for logic level control, or an AND gating circuit with three input leads (as
shown) is used for logic level control with a switch 24 set to enable the AND
gating circuit. Synchronizing pulse control is added by thr...