| 摘要 |
PURPOSE:To obtain an inexpensive and high-S/N data collecting circuit by using a reference ramp function in common to all channels. CONSTITUTION:Respective counters K1-Kn start counting and the level of the ramp function is increased; when the level exceeds output levels V1-Vn of respective signal channels successively, outputs of comparators C1-Cn are inverted to 0 and a clock is not inputted from the counter Kn to the counter K1. Clocks corresponding to differences between the levels V1-Vn and a reference voltage VL remain in the counters K1-Kn. For the purpose, one ramp function generator 10 is provided, and a comparator, gate, and counter are installed for every channel; this simple constitution digitizes analog input signals of all the channels and performs A/D conversion over all the channel within a single ramp generation period to speed up the operation. |
