Oscillators – With device responsive to external physical condition – Temperature or light responsive
Reexamination Certificate
2006-07-21
2010-12-07
Mis, David (Department: 2817)
Oscillators
With device responsive to external physical condition
Temperature or light responsive
C331S044000, C331S1170FE, C331S1170FE, C331S17700V, C332S130000, C332S136000
Reexamination Certificate
active
07847644
ABSTRACT:
A modulation-signal generating circuit includes a temperature monitoring unit that detects a casing temperature of the circuit, a voltage control oscillator including two variable impedance circuits that independently control oscillation frequency based on an input control voltage, a frequency-correction-voltage generating unit that outputs a voltage for compensating for a temperature drift of an oscillation frequency according to the casing temperature detected by the temperature monitoring unit, to one of the variable impedance circuits, and an FM-modulation-voltage generating unit that outputs a modulation voltage containing a constant DC component not depending on temperature and a predetermined AC component, to the other variable impedance circuit, under a temperature drift compensation condition of the frequency-correction-voltage generating unit.
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Mis David
Mitsubishi Electric Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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