Patent ID: 8144047

Claim:
A current-mode dual-slope temperature-digital conversion device comprising a first switch; a second switch connected with said first switch, wherein said first switch and said second switch are controlled by a group of non-overlapped control signals; a temperature-dependent current source connected with said first switch and generating a temperature-dependent current; a reference current source connected with said second switch and generating a reference current; a capacitor with one terminal connected with said first switch and said second switch and with another terminal connected with a reference voltage, wherein when said first switch is turned on, said temperature-dependent current charges said capacitor, and wherein when said second switch is turned on, said reference current discharges said capacitor; at least one trigger with an input terminal connected with said first switch, said second switch and said capacitor, setting a trigger voltage, comparing a terminal voltage of said capacitor with said trigger voltage and outputting a first digital signal; a logical controller connected with an output terminal of said trigger and said second switch, receiving said first digital signal, outputting a second digital signal according to a switching state of said second switch and said first digital signal; and a time-to-digital converter receiving said second digital and a clock signal, working out a count of clock cycles corresponding to said clock signal according to said second digital signal, and generating a digital output value corresponding to said count when said reference current discharges said capacitor and before said first digital signal varies.