Apparatus and method for comparison of a plurality of analog signals with selected signals
First Claim
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1. Apparatus for comparing a digitized analog signal with a digital signal, the comparison of the digitized analog signal and the digital signal being applied to a processing unit, the apparatus comprising:
- a sequential control unit, the sequential control unit supplying control signals;
a multiplexer having a plurality of analog signals applied to input terminals thereof, the control signals selecting the analog signal to be digitized;
an analog-to-digital converter, the analog-to-digital converter digitizing the selected analog signal;
a plurality of buffer register pairs;
a switch unit responsive to the control unit for selecting one of the buffer register pairs;
a first buffer register of a selected buffer register pair coupled to the switch unit, the first buffer register storing the digitized signal;
a second buffer register of the selected buffer register pair being coupled to an output of the switch unit storing the digital signal that has been digitized by the analog-to-digital converter; and
a comparator having first input terminal coupled to the first buffer register, the comparator having a second input terminal coupled to the second buffer register, the output terminal of the comparator providing a comparison between the digitized and digital signals to the processing unit in response to the control signals.
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Abstract
In response to a selected analog applied to the input terminal of an analog-to-digital converter, the digitized output signal is stored in a buffer/register. In making a comparison with a predetermined value, a second buffer/register stores either a preselected value or a second digitized signal. A comparator is coupled to the first and the second buffer/register to provide the result of a comparison. In this manner, the central processing unit is not involved in the comparison testing procedure.
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Citations
11 Claims
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1. Apparatus for comparing a digitized analog signal with a digital signal, the comparison of the digitized analog signal and the digital signal being applied to a processing unit, the apparatus comprising:
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a sequential control unit, the sequential control unit supplying control signals; a multiplexer having a plurality of analog signals applied to input terminals thereof, the control signals selecting the analog signal to be digitized; an analog-to-digital converter, the analog-to-digital converter digitizing the selected analog signal; a plurality of buffer register pairs; a switch unit responsive to the control unit for selecting one of the buffer register pairs; a first buffer register of a selected buffer register pair coupled to the switch unit, the first buffer register storing the digitized signal; a second buffer register of the selected buffer register pair being coupled to an output of the switch unit storing the digital signal that has been digitized by the analog-to-digital converter; and a comparator having first input terminal coupled to the first buffer register, the comparator having a second input terminal coupled to the second buffer register, the output terminal of the comparator providing a comparison between the digitized and digital signals to the processing unit in response to the control signals. - View Dependent Claims (2, 3, 4)
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5. A method of providing a signal applying a comparison signal defining a relationship between a first analog signal and a second signal to a processing unit, the method comprising:
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selecting the first analog signal and the second signal from a plurality of analog signals with a multiplexer; digitizing the first signal and the second signal in an analog-to-digital converter; storing the digitized first signal in a selected first buffer register of a plurality of buffer register pairs selected by a switch unit; storing a digitized second signal in a second buffer register of the selected buffer register pair selected by the switch unit; comparing the first signal and the second signal with a comparator;
applying the output signal of the comparator to the processing unit; andcoordinating the selecting the first analog signal, storing the digitized first signal and applying the output signal with control signals from a sequential control unit. - View Dependent Claims (6, 7)
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8. Apparatus for comparing a first analog signal and a second signal and providing the results to a processing unit, the apparatus comprising:
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a multiplexer having a plurality of analog signals applied to input terminals thereof, the multiplexer responsive to control signals for selecting a selected analog signal; an analog-to-digital converter, the analog-to-digital converter converting the selected analog input signal to one of a digitized first signal and a digitized second signal; at least one buffer register pair; a switch unit coupled between an output terminal of the analog-to-digital converter and a first buffer register and a second buffer register of a buffer register pair in response to control signals; a comparator coupled to the first buffer register and to the second buffer register, the comparator generating a comparison signal, the comparison signal being applied to a processing unit in response to control signals; and a control unit, the control unit selecting the multiplexer input signal, selecting the buffer register pair, and controlling the application of the comparison signal to the processing unit. - View Dependent Claims (9, 10, 11)
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Specification