Patent ID: 7088278

Claim:
A multiple input AD conversion apparatus which converts a first analog input signal and a second analog input signal to a first digital output signal and a second digital output signal respectively, the multiple input AD conversion apparatus comprises: a first unit AD converter including a plurality of first conversion stages connected in cascade to convert the first analog input signal to the first digital output signal; a second unit AD converter including a plurality of second conversion stages connected in cascade to convert the second analog input signal to the second digital output signal; a plurality of operational amplifiers each configured to be shared between a corresponding first conversion stage of the first conversion stages and a corresponding second conversion stage of the second conversion stages in a time sharing; and a first timing correction circuit and a second timing correction circuit which are arranged on output sides of the first unit AD converter and the second unit AD converter respectively to correct a timing deviation between output timings of the first digital output signal and the second digital output signal respectively, the first timing correction circuit comprises a delay circuit to correct the deviation of the output timing and a first digital filter having n taps (n is integer), and the second timing correction circuit comprises a second digital filter having (n−1) taps. and the first digital filter and the second digital filter have an approximately identical impulse response.