Voltage-frequency converter circuit with temperature compensatio

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Converting input current or voltage to output frequency

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327 73, 327 78, 327561, 327513, H03C 306

Patent

active

055857485

ABSTRACT:
In a voltage-frequency converter having an integration circuit for integrating an input voltage signal in positive and negative directions, a first comparator is connected to switch integration direction of the integration circuit and a second comparator is connected to compare an integration output signal and a threshold signal. A delay circuit delays one of rising and falling edges of a second comparator output signal to be used as the threshold signal. The second comparator compares the delayed signal with a reference signal varying in accordance with a temperature and produces a second comparator output signal by which the integrating direction is switched. By the use of the delayed signal and the temperature dependent reference signal, a frequency change in the second comparator output signal caused by response time delays of the comparators is compensated for.

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patent: 5166550 (1992-11-01), Matsubara et al.
patent: 5204631 (1993-04-01), Hobbs
patent: 5350950 (1994-09-01), Inaba et al.
patent: 5495193 (1996-02-01), Nukui

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