CMOS analog-to-digital converter and temperature sensing device

Details CMOS analog-to-digital converter and temperature sensing device CMOS analog-to-digital converter and temperature sensing device

1998-06-09

2000-08-29

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 166

Patent

active

061115339

ABSTRACT:
An analog-to-digital converter receives slow-varying analog voltages from a sensing device and converts the slow-varying analog voltages to digital signals. The sensing device generates a slow-varying analog voltage directly proportional to absolute temperature. The analog-to-digital converter includes a second counter which receives the pulse train from the second voltage controlled oscillator that counts the number of pulses which informs the first counter whenever the count value thereof reaches a fixed number and resets the count value thereof to zero. As the first counter is being informed by the second counter, its count value is read and then reset to zero. The read count represents a digital signal corresponding to the slow-varying analog voltages input.

REFERENCES:
patent: 3833903 (1974-09-01), Gordon et al.
patent: 4025868 (1977-05-01), Miki et al.
patent: 4366468 (1982-12-01), Yoneyama
patent: 4435697 (1984-03-01), Takahashi
patent: 4471340 (1984-09-01), Lewis
patent: 4521763 (1985-06-01), Murao et al.

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