Signal processing circuits with digital programmability
First Claim
1. An integrated circuit comprising:
- a plurality of analog signal processing channels, each said signal processing channel having a plurality of digitally controllable functions; and
digital control means for controlling said plurality of digitally controllable functions, said digital control means further comprising;
a digital input signal, said digital input signal further comprising command input bits and data input bits; and
command decoder means for decoding said command input bits into a plurality of register selection signals; and
a plurality of control register means for storing said data input bits, each said control register means having a plurality of control outputs, each said control output having a plurality of control bits;
wherein each said control register means is selected by one said register selection signal within said plurality of register selection signals; and
wherein a particular control register means stores said data input bits if selected by the corresponding register selection signal; and
wherein each said digitally controllable function is controlled by one particular control output within said plurality of control outputs of one particular control register within said plurality of control registers.
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Abstract
A mixed analog and digital integrated circuit with features which are especially useful for application as a front end for physiological signal instrumentation such as electrocardiographs, electromyographs, and electroencephalographs. The integrated circuit has 5 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 2 digital serial input lines and 2 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 6 compatible devices can be serially connected in a chain.
64 Citations
20 Claims
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1. An integrated circuit comprising:
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a plurality of analog signal processing channels, each said signal processing channel having a plurality of digitally controllable functions; and digital control means for controlling said plurality of digitally controllable functions, said digital control means further comprising; a digital input signal, said digital input signal further comprising command input bits and data input bits; and command decoder means for decoding said command input bits into a plurality of register selection signals; and a plurality of control register means for storing said data input bits, each said control register means having a plurality of control outputs, each said control output having a plurality of control bits; wherein each said control register means is selected by one said register selection signal within said plurality of register selection signals; and wherein a particular control register means stores said data input bits if selected by the corresponding register selection signal; and wherein each said digitally controllable function is controlled by one particular control output within said plurality of control outputs of one particular control register within said plurality of control registers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification