Fast Low Duty-Cycle Pulse Oscillator

Posted on Jun 7, 2012

This simple and symmetrical free-running generator has a 50- output impedance, a pulse width of 100 ns

Fast Low Duty-Cycle Pulse Oscillator
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and complementary outputs that swing essentially from ground to the power-supply voltage. Moreover, it functions with a power supply range from < 1 to > 15 V and maintains a low voltage and temperature drift while consuming little power. For oscillation to occur, each transistor must have a gain greater than unity. This restricts the value of R to a range of 1 kfi to 1, because the gain will be less than unity when the transistor is saturated or when beta is low as a result of small collector currents. The two RC timing networks do not have to match because the RC with the longest time constant will determine the frequency of oscillation.

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