Oscillators – Relaxation oscillators
Patent
1992-11-18
1994-04-19
Gensler, Paul
Oscillators
Relaxation oscillators
328 16, 331 57, 307271, 377 47, H03B 1900
Patent
active
053049381
ABSTRACT:
A method and apparatus for providing a lower frequency signal with reference to a higher frequency signal are disclosed. The apparatus of the invention comprises an oscillating signal generator, an integer logical divider, and a signal combiner. The signal generator receives an input voltage and, in response thereto, generates a first output oscillating signal and a second output oscillating signal, both having a first frequency. The two oscillating signals are separated by a ninety-degree phase shift. The integer logical divider receives the two oscillating signals and provides two output divided signals in response. The first divided signal is representative of the first oscillating signal except that its frequency is one-third the frequency of the first oscillating signal. Likewise, the second divided signal is representative of the second oscillating signal except that its frequency is one-third that of the second oscillating signal. The signal combiner receives these two divided signals and performs an XOR operation on them to produce an output signal having a second frequency which is equal to the first frequency divided by 1.5. Thus, the apparatus of the invention performs a logical divide-by 1.5 operation. By adjusting the phase difference between the two oscillating signals, and by properly modifying the other elements of the apparatus, other logical divide-by operations may be performed.
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Bleasdale Nigel
Gregory Paul
Leuthold Oskar
Fernandez Dennis S.
GEC Plessey Semiconductors, Inc.
Gensler Paul
Kinkead Arnold
Truong Phong K.
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