Appeal No. 1998-0441
Application 08/713,089
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claims 2, 3, 7-9, 11-14, 16, 17, and
19.
We reverse.
BACKGROUND
The invention is directed to a ring oscillator circuit
which undergoes only slight changes in frequency in response
to a wide variation in power supply voltage by using a
constant voltage circuit.
Claim 2 is reproduced below.
2. A ring oscillator circuit comprising: an odd
number of inverter circuits connected in a ring
configuration; a constant current element connected in
series between an output of a respective inverter
circuit and an input of the next inverter circuit; and
a constant voltage circuit comprising MOS transistors
for receiving an external power source voltage and
applying a constant voltage to said constant current
elements.
The Examiner relies on the following prior art:
Dingwall et al. (Dingwall) 4,072,910 February 7,
1978
Matsuura 4,618,837 October 21,
1986
Sakurai 4,853,654 August 1,
1989
Motegi et al. (Motegi) 4,912,433 March 27,
1990
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