Oscillators – Plural oscillators – Selectively connected to common output or oscillator...
Reexamination Certificate
2007-03-27
2007-03-27
Mis, David (Department: 2817)
Oscillators
Plural oscillators
Selectively connected to common output or oscillator...
C331S143000, C331S153000, C331S173000
Reexamination Certificate
active
10971502
ABSTRACT:
An integrated circuit includes an oscillator circuit, where a frequency of an oscillator output signal provided by the oscillator circuit is adjustable by either coupling a resistor to an input pin, or by applying an external clock signal to the input pin. The oscillator circuit includes a comparator, a follower, a current-controlled oscillator, and a switch circuit. The switch circuit is coupled between the input pin and a node that is coupled to the current-controlled oscillator. Also, the follower is arranged to cause the voltage at the node to be at a pre-defined voltage unless the voltage at the node is overdriven by an external clock signal. The comparator circuit is arranged to determine whether the signal at the input pin is a clock signal. If it is determined that the signal at the input pin is a clock signal, the switch circuit is opened.
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Chiu Kwok-Fu
Silva Faruk Jose Nome
Darby & Darby PC
Gaffney Matthew M.
Mis David
National Semiconductor Corporation
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