Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Converting input frequency to output current or voltage
Patent
1995-05-31
1998-01-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Converting input frequency to output current or voltage
327 23, 327 24, H03K 906
Patent
active
057083789
ABSTRACT:
In a frequency-to-voltage converting circuit, a clamping frequency is maintained constant without being adversely influenced by circuit constants, and temperature characteristics. The frequency-to-voltage converting apparatus has voltage converting means for converting a frequency of an input pulse signal into a voltage, arranged by frequency judging means for judging whether or not the frequency of the input pulse signal reaches a predetermined clamping frequency. Setting pulse signal generating means outputs a setting pulse signal having the clamping frequency, and means for causing the voltage converting means to convert the frequency of the input pulse signal into the voltage when the frequency of the input pulse signal does not reach the clamping frequency based on a judgement result of the frequency judging means. The voltage converting means is caused to convert the clamping frequency of the setting pulse signal derived from the setting pulse signal generating means when the frequency of the input pulse signal reaches the clamping frequency.
REFERENCES:
patent: 3778638 (1973-12-01), Garratt
patent: 4446439 (1984-05-01), Mizumoto et al.
Harada Takuya
Horie Masakiyo
Callahan Timothy P.
Le Dinh
Nippondenso Co. Ltd.
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