Configurable mixed-signal systems
An electronic system includes a configurable processing device. The configurable processing device includes a processor that performs digital processing, a first input that receives digital signal, a first output that sends digital signal and a converter that converts between analog and digital signals. The converter includes a delta-sigma modulator.
1. An electronic system comprising:
an analog-to-digital converter that converts an analog signal to a digital signal, the analog-to-digital converter including:
a first input that receives the analog signal,
a second input that receives a reference signal,
a network of passive components including at least one resistor and one capacitor, the network of passive components being connected to the first input, and
a configurable processing device, including:
a low voltage differential signaling (LVDS) comparator having a first comparator input connected to the reference signal, having a second comparator input connected to the network of passive components and having a comparator output, and
a flip-flop (FF) having a FF input connected to the comparator output and having an FF output that produces the digital signal, the FF output being connected and providing feedback to the network of passive components.
2. An electronic system as in claim 1 :
wherein parameters for the analog-to-digital converter are selected based on a simulation of performance of the analog-to-digital converter within the configurable processing device.
3. An electronic system as in claim 1 , additionally comprising:
a filter that filters the digital signal.
4. An electronic system as in claim 3 wherein the filter is one of:
a moving average filter
a decimation filter;
a calibration module;
a zero offset filter.
5. An electronic system as in claim 1 wherein the configurable processing device is a programmable logic device.
6. An electronic system as in claim 1 wherein the configurable processing device is a field programmable gate array.
7. An electronic system as in claim 1 wherein the configurable processing device is configured to operate as an analog modem.
8. An electronic system as in claim 1 wherein the configurable processing device is configured to operate as an inter-range instrumentation group modem.
9. An electronic system as in claim 1 wherein the configurable processing device is configured to operate as a highway addressable remote transducer modem.
10. An electronic system as in claim 1 , wherein the network of passive components comprises:
a first resistor having a first end connected to the first input, and having a second end connected to the second comparator input;
a second resistor having a first end connected to the second end of the first resistor, and having a second end connected to the FF output; and
a first capacitor having a first end connected to the second end of the first resistor, and having a second end connected to a reference voltage.
11. An electronic system as in claim 1 , wherein the network of passive components comprises:
a first resistor having a first end connected to the first input, and having a second end;
a second resistor having a first end connected to the second end of the first resistor, and having a second end connected to the FF output;
a first capacitor having a first end connected to the second end of the first resistor, and having a second end connected to a reference voltage;
a third resistor having a first end connected to the second comparator input, and having a second end connected to connected to the first input, and having a second end to the FF output;
a fourth resistor having a first end connected to the second end of the first resistor, and having a second end connected to the first end of the third resistor; and
a capacitor having a first end connected to the second end of the fourth resistor, and having a second end connected to the reference voltage.
12. An electronic system as in claim 1 , wherein the network of passive components comprises:
a first resistor having a first end connected to the first input, and having a second end;
a second resistor having a first end connected to the second end of the first resistor, and having a second end connected to the FF output;
a capacitor having a first end connected to the second end of the first resistor, and having a second end connected to the second comparator input; and,
a second comparator having a first comparator input connected to the second end of the first resistor, having a second input connected to a reference voltage, and having an output connected to the second end of the capacitor.
13. An electronic system comprising:
an analog-to-digital converter that converts an analog signal to a digital signal, the analog-to-digital converter including:
a first input that receives the analog signal,
a second input that receives a reference voltage,
a network of passive components including at least one resistor and one capacitor, the network of passive components being connected to the first input, and
a configurable processing device, including
a low voltage differential signaling (LVDS) comparator having a first comparator input connected to the reference voltage, having a second comparator input connected to the network of passive components and having a comparator output, and
a flip-flop (FF) having a FF input connected to the comparator output and having an FF output that produces the digital signal, the FF output being connected and providing feedback to the network of passive components.
14. An electronic system as in claim 13 :
wherein parameters for the analog-to-digital converter are selected based on a simulation of performance of the analog-to-digital converter within the configurable processing device.
15. An electronic system as in claim 13 , additionally comprising:
a filter that filters the digital signal.
16. An electronic system as in claim 15 wherein the filter is one of:
a moving average filter
a decimation filter;
a calibration module;
a zero offset filter.
17. An electronic system as in claim 13 wherein the configurable processing device is a programmable logic device or a field programmable gate array.
18. An electronic system as in claim 13 wherein the configurable processing device is configured to operate as an analog modem.
19. An electronic system as in claim 13 wherein the configurable processing device is configured to operate as an inter-range instrumentation group modem or as a highway addressable remote transducer modem.
20. An electronic system comprising:
a delta-sigma modulator analog-to-digital converter that converts an analog signal to a digital signal, the analog-to-digital converter including:
a first input that receives the analog signal,
a second input that receives a reference signal,
a network of passive components including at least one resistor and one capacitor, the network of passive components being connected to the first input, and
a configurable processing device, including:
a low voltage differential signaling (LVDS) comparator having a first comparator input connected to the reference signal, having a second comparator input connected to the network of passive components and having a comparator output, and
a flip-flop (FF) having a FF input connected to the comparator output and having an FF output that produces the digital signal, the FF output being connected and providing feedback to the network of passive components.