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An ultra-low power, fast start fuze oscillator contained in a fast moving projectile which contains a programmable projectile fuze. It is an RC oscillator which uses a low power comparator, three biasing resistors, a timing resistor and a timing capacitor to produce an output frequency as low as 8 k

An ultra-low power, fast start fuze oscillator contained in a fast moving projectile which contains a programmable projectile fuze. It is an RC oscillator which uses a low power comparator, three biasing resistors, a timing resistor and a timing capacitor to produce an output frequency as low as 8 kHz with a frequency error of less than .+-.0.1% over a -40.degree. C. to +60.degree. C. temperature range. At the same time, it is capable of surviving a high g environment (30,000 g to 60,000 g) in a reliable manner. Furthermore, the oscillator draws a very low amount of power, using a maximum of about 20 uA of current and has a start-up time limited to a maximum of 1.5 msec. An additional circuit can be connected to the positive supply voltage input of a lower current version of an RC oscillator to jump start the RC oscillator, thereby improving start-up time to 1.5 msec while reducing the current drain to 15 uA.

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[ What we claim as our invention is:] [1.] An oscillator apparatus comprising a comparator having a negative input, a positive input, a positive voltage supply input (V.sub.CC), a negative voltage supply input (-V.sub.CC) and an output, a timing capacitor, a timing resistor having a first end and a

[ What we claim as our invention is:] [1.] An oscillator apparatus comprising a comparator having a negative input, a positive input, a positive voltage supply input (V.sub.CC), a negative voltage supply input (-V.sub.CC) and an output, a timing capacitor, a timing resistor having a first end and a second end, and a first, a second and a third biasing resistor, each having a first and a second end;said timing resistor is connected between and is electrically coupled to said output of said comparator and said negative input of said comparator;said first biasing resistor is connected between and electrically coupled to said positive input of said comparator and said negative supply voltage input of said comparator;said second of said biasing resistors is connected between and electrically coupled to said positive input of said comparator and said positive supply voltage input of said comparator;said third of said biasing resistors is connected between and electrically coupled to said positive input of said comparator and said output of said comparator;said timing capacitor is connected between and electrically coupled to said negative supply voltage input and said negative input of said comparator, whereby when the circuit is energized, the output voltage appearing on the output of said comparator swings between +V.sub.CC and -V.sub.CC with a frequency equal to 0.72/RC, where R equals the resistance of said timing resistor and C equals the capacitance of said timing capacitor; anda capacitor having two terminals and a first diode having a cathode and an anode and a second diode having an anode and a cathode;one terminal of said capacitor is connected to 11.5 volts and the second terminal of said capacitor is connected to said anode of said first diode;said cathode of said first diode is connected and electrically coupled to said positive supply voltage input of said comparator;said anode of said second diode is connected and electrically coupled to 3.3 volts and said cathode of said second diode is connected and electrically coupled to said positive supply voltage input of said comparator, whereby the supply voltage is first connected to 11.5 volts for a few milliseconds (for fast start-up) and then falls to 3.3 volts (less a diode drop).