Frequency and capacitor based constant current source

Details Frequency and capacitor based constant current source Frequency and capacitor based constant current source

1991-10-21

1993-09-21

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

307597, 307603, 328155, 331 1A, 331 17, 331DIG2, G05F 316

Patent

active

052472418

ABSTRACT:
The present invention is a constant current source whose magnitude is proportional to capacitor values, reference voltage and input frequency. A frequency divider provides a plurality of signals to one of a plurality of capacitor switches located within a charge generator. The outputs of the capacitor switches are combined to provide a known charge Q.sub.i to an output generator at regular intervals, t.sub.0 =1/F.sub.in. The output generator produces an output current I.sub.out =Q.sub.i /t.sub.0 =C.sub.i *V.sub.bg *F.sub.in, where C.sub.i is a capacitor value, V.sub.bg is a reference voltage, and F.sub.in is the input frequency. A controller provides a control signal to the output generator to limit variations in the output current I.sub.out. The preferred embodiment may be used in conjunction with process invariant circuits in a variety of semiconductor technologies: CMOS, Bipolar, BiCMOS and GAS. In one embodiment, the present invention is used in conjuction with a timer/delay circuit. In another embodiment, the present invention is used in conjunction with a calibration circuit to compensate for various inaccuracies in component performance.

REFERENCES:
patent: 4633164 (1986-12-01), Kaiser
patent: 5059838 (1991-10-01), Motegi et al.
patent: 5144156 (1992-09-01), Kawasaki

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