Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Converting input current or voltage to output frequency
Reexamination Certificate
2007-10-09
2007-10-09
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Converting input current or voltage to output frequency
C327S100000
Reexamination Certificate
active
11333539
ABSTRACT:
A voltage-frequency conversion apparatus which comprises a variable current source for charging a capacitor; a current amount adjustment circuit which has a first resistor for applying a first voltage and a second resistor for applying a second voltage and adjusts the amount of a current from the variable current source to be corresponding to a differential voltage between the first voltage and the second voltage; a comparator that compares a charging voltage across the capacitor and a reference voltage; and a discharge circuit that discharges the capacitor when the charging voltage exceeds the reference voltage. The comparator generates a frequency signal according to the differential voltage. The conversion apparatus further comprises a reference voltage control circuit that, when a resistance of the first or second resistor varies according to its temperature characteristic, changes the value of the reference voltage according to the variation in the resistance so as to maintain constant a frequency of the frequency signal.
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Senriuchi Tadao
Yonezawa Yoshiaki
Fish & Richardson P.C.
Nguyen Hai L.
Sanyo Electric Co,. Ltd.
Tra Quan
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