G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 1/08 (2006.01) G05F 3/22 (2006.01) G06F 1/04 (2006.01) H03K 3/0231 (2006.01)
Patent
CA 2052248
ABSTRACT Disclosed are a constant current circuit which pro- vides an output current I2 which varies with changes of power source voltage Vcc, and an oscillating circuit whose oscillation frequency varies with changes of I2 in the constant current circuit. The constant current circuit comprises bipolar transis- tors coupled to form a differential amplifier, wherein one of the transistors is supplied with a reference voltage and another is supplied with a divided voltage of Vcc, and a resistor connecting the emitters of the transistors is provided for controlling the slope of the Vcc-I2 characteristic curve of the constant current circuit. The oscillating circuit comprises a capacitor charged with I2 and a switching means for discharging the capacitor when it is closed and a voltage detecting means operating to close or open the switching means according to the voltage detected at an end of the capacitor. Thus, the switching means cycles on and off to generate pulses with a frequency depending on I2 and hence depending on Vcc. Methods for controlling the frequency range of the oscillating circuit and the rise time to fall time ratio of the pulses by introducing additional constant current supplying sources are also disclosed.
Inoue Shuichi
Suwada Makoto
Usui Yuzo
Fetherstonhaugh & Co.
Fujitsu Limited
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