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The circuit of Fig 1 generates a fast triangular-shaped pulse either positive or negative polarity, with programmable slopes, and with complete freedom from switching noise at the peak of the pulse.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
88% of the total text.
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A High-Speed, Glitch-Free Triangle Pulse Generator
The circuit of Fig 1 generates a fast triangular-shaped pulse either positive or
negative polarity, with programmable slopes, and with complete freedom from
switching noise at the peak of the pulse.
The desired results are achieved using a single high-speed current switch to
control the charge current to a capacitor. Referring to Fig 1, the current-switching
element is implemented using a high-speed transistor pair, T1 and T2, and is
controlled by the differential input signal pair +IN and -IN. This switch controls
the flow of I-, determining whether or not that current contributes, along with I+, to
the charging of capacitor C. Both I+ and I- are digitally programmable. Diodes
D1 and D2 are high-speed switching diodes and serve to limit the charge voltage
across capacitor C to within a range from slightly higher than Vstop+ to slightly
lower than Vstop-.
Referring to Fig 2, with +IN low, and assuming I- > I+, as would be the case
for normal operation, the voltage across capacitor C is initially at the point
determined by the conduction of diode D2. When +IN goes high, I+ charges
capacitor C at the rate dVout/dt = I+ / C. When +IN goes back LOW, C
discharges again at the rate dVout/dt = (I+ - I-) / C until Vout again reaches the
point where diode D2 conducts. For an inverted triangle, the +IN pulse is simply
inverted, with the positive and negative slopes of the resulting waveform defined
by the same formulas as...