Signal identification method and apparatus for analogue electrical systems

• US 7,266,463 B2
• Filed: 05/10/2005
• Issued: 09/04/2007
• Est. Priority Date: 05/10/2005
• Status: Expired due to Fees

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: International Business Machines Corporation
• Inventors: Dixon, Robert Christopher, Hartfiel, John Wayne, Pham, Tung Nguyen, Le, Hein Minh
• Primary Examiner(s): Tsai; Carol S. W.
• Assistant Examiner(s): Charioui; Mohamed
• Application Number:
  US11/126,120
• Publication Number:
  US 20060259161A1
• Time in Patent Office: 847 Days
• Field of Search: 702/57, 702/64, 702/118, 702/120, 702/183, 702/185, 702/189, 375/220, 370/212, 700/25
• US Class Current: 702/64
• CPC Class Codes: G01R 31/3167 Testing of combined analog and digital circuits testing ADC's H03M1/1071
• CPC Class Codes: G01R 31/31924 Voltage or current aspects, e.g. driver, receiver

Abstract

An apparatus, a method, and a computer program product are provided for identifying signals in analogue electrical systems. The ID select signals that control the timing of this signal identification circuit comprise sequential numbers that count up and identify a corresponding signal. The signals to be identified are located on a group of input/output (I/O) pins. One multiplexer (first) selects a specific I/O pin in response to the ID select signals. An isolated voltage source is connected to this multiplexer and provides the selected signal to another multiplexer (second). The second multiplexer switches from this isolated voltage source to ground potential in response to the ID select signals. The isolated voltage source floats at the DC level of the selected I/O driver pin. Therefore, by connecting to the selected signal'"'"'s I/O pin and the output of the second multiplexer, the selected signal can be identified and then probed.

Claims

1. An apparatus for identifying signals in analogue electrical systems by utilizing a plurality of identification (ID) select signals comprising:

a plurality of input/output (I/O) pins;

at least one first multiplexer which interfaces with at least one isolated voltage source, wherein the at least one first multiplexer is at least configured to select a corresponding I/O pin of the plurality of I/O pins in response to a selected ID select signal from the plurality of ID select signals;

and wherein the at least one voltage source is at least configured to produce an alternating current (AC) signal in response to the selected ID select signal; and

at least one second multiplexer which interfaces with the at least one voltage source, wherein the at least one second multiplexer is at least configured to select the at least one isolated voltage source and ground in response to the selected ID select signal.

2. The apparatus of claim 1, wherein the apparatus further comprises:

at least one ID signal lookup table that is at least configured to store information about the plurality of signals; and

at least one modulator that interfaces the at least one ID signal lookup table and the at least one isolated voltage source.

3. The apparatus of claim 2, wherein the at least one ID signal lookup table is at least configured to receive the plurality of ID select signals and transmit information about the plurality of ID select signals.

4. The apparatus of claim 3, wherein the at least one modulator is at least configured to control the voltage of the at least one isolated voltage source in response to the output of the at least one ID signal lookup table.

5. The apparatus of claim 1, wherein the plurality of ID select signals comprise sequential numbers that count up and identify the corresponding I/O pin of the plurality of I/O pins.

6. The apparatus of claim 1, wherein the plurality of ID select signals are input signals, output signals, or bi-directional signals.

7. The apparatus of claim 1, wherein the at least one first multiplexer further comprises an internal switch that connects the at least one isolated voltage source to the corresponding I/O pin of the plurality of I/O pins in response to the selected ID select signal in the plurality of ID select signals.

8. The apparatus of claim 1, wherein the at least one second multiplexer further comprises an internal switch that connects an ID/GND pin to the at least one isolated voltage source or ground in response to the selected ID select signal in the plurality of ID select signals.

9. The apparatus of claim 1, wherein the at least one isolated voltage source is not referenced to ground and floats at the voltage level of the corresponding I/O pin of the plurality of I/O pins in response to the selected ID select signal in the plurality of ID select signals.

10. A method for identifying signals in analogue electrical systems by utilizing a plurality of ID select signals comprising:

generating, using an ID signal lookup table, a selected ID select signal from the plurality of ID select signals;

selecting, using a first multiplexer, one of a plurality of I/O pins that corresponds to the selected ID select signal in response to receiving the selected ID select signal in the first multiplexer;

producing, using an isolated voltage source, an AC signal from a selected signal of a plurality of signals in response to receiving the selected ID select signal;

selecting, using a second multiplexer, the AC signal and ground potential in response to receiving the selected ID select signal in the second multiplexer;

probing, using test equipment, the plurality of I/O pins to identify the selected signal on one of the plurality of I/O pins; and

displaying the selected signal.

11. The method of claim 10, wherein the generating step further comprises generating the ID select signals such that the generated ID select signals contain sequential numbers that count up and identify a corresponding I/O pin of the plurality of I/O pins.

12. The method of claim 10, wherein the producing step further comprises utilizing an isolated voltage source to produce the AC signal.

13. The method of claim 10, wherein the selecting step further comprises selecting the AC signal to identify the selected ID select signal of the plurality of ID select signals and selecting ground potential to probe the selected ID select signal of the plurality of ID select signals.