Oscillators – With frequency calibration or testing
Patent
1998-04-03
1999-12-21
Grimm, Siegfried H.
Oscillators
With frequency calibration or testing
331111, 331143, 331179, H03K 30231
Patent
active
060054476
ABSTRACT:
An integrated RC oscillator circuit includes a reference voltage generator, a fine tuner, a charging/discharging oscillator, a frequency counter, and a comparator. The reference voltage generator generates stable reference voltages Vref, Vref 1 to Vref 31, 3/4Vref and 1/2Vref. The fine tuner receives as inputs a reset signal, Vref and Vref 1 to Vref 31 and outputs a reference voltage PVref (0<P<1). The charging/discharging oscillator receives as inputs an enable signal, PVref, Vref, 3/4Vref and 1/2Vref and outputs a square wave signal whose frequency is determined by a resistor, a capacitor and the value of P. The frequency counter receives as inputs the reset signal, a timing reference clock and the square wave signal, it counts the frequency of the square wave signal and outputs the frequency value, and it also outputs a PROGRAM signal to the fine tuner. The comparator is a ROM having a table to compare the frequency value from the frequency counter with a preset value to generate a relative value FUSE(0-4) which is supplied to the fine tuner. FUSE(0-4) causes related fuses to be burned out in the fine tuner, so that the fine tuner will generate a new P value, and the oscillator will therefore obtain an accurate frequency.
REFERENCES:
patent: 5070311 (1991-12-01), Nicolai
patent: 5182528 (1993-01-01), Zuta
Grimm Siegfried H.
Princeton Technology Corp.
LandOfFree
Method and device for adjusting the frequency of oscillator buil does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for adjusting the frequency of oscillator buil, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for adjusting the frequency of oscillator buil will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-508914