| 摘要 |
PURPOSE: An apparatus of adjusting multi-channel squid system using digital signal is provided to extend a channel simply without affecting a system by transferring data, clock and control signals via three digital ports and controlling channel selection, channel voltage and switch adjustment using one control signal, only when voltage and switch adjustment is needed. CONSTITUTION: Three digital ports(DT,CK,CS) receives three digital signals such as data, clock and control signals. Each channel adjusting means(20(1)-20(N)) receives the data signal in synchronization with the clock signal when the control signal is at the first level, selects a channel when the control signal transitions to the second level, and controls output adjustment of the selected channel. The channel adjusting means comprises a channel selection part(30) and an adjusting part(50). The channel selection part(30) receives the data signal when the control signal is at the first level, and compares the data signal with a predetermined channel proper number when the control signal transitions to the second level. If the data signal is identical to the channel proper number, the channel selection part outputs a valid channel select signal. The adjusting part(50) receives when the control signal is at the second level and receive the valid channel select signal. The adjusting part converts a data signal input when the control signal transitions to the first level, into a signal for adjusting a switch and a voltage of a corresponding channel.
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