| 摘要 |
<p>A mixed analog and digital integrated circuit for physiological signal instrumentation such as electrocardiographs, electromyographs, and electroencephalographs, comprises analog signal processing channels having functions controlled by a digital control (364) with command input bits (1902) and data input bits (1904), and control registers (1912,1914,1916,1918) which are selected to store corresponding data bits and which have control outputs which effect the digital control of the analog signal processing channels. The integrated circuit has five signal channels, each with analog amplification and analog to digital conversion. The channels can be configured for various combinations of input signal amplification, input signal summation, analog output driving, and AC impedance measurement. The integrated circuit has two digital serial input lines and two digital serial output lines, all designed for direct connection to optical couplers. Channel configuration, gain, and other parameters are externally controllable by a serial digital input signal. Up to six compatible devices can be serially connected in a chain. <IMAGE></p> |
