TW200715174A - Circuit and process for photo coupling detection - Google Patents
Circuit and process for photo coupling detectionInfo
- Publication number
- TW200715174A TW200715174A TW094134437A TW94134437A TW200715174A TW 200715174 A TW200715174 A TW 200715174A TW 094134437 A TW094134437 A TW 094134437A TW 94134437 A TW94134437 A TW 94134437A TW 200715174 A TW200715174 A TW 200715174A
- Authority
- TW
- Taiwan
- Prior art keywords
- signal level
- signal
- circuit
- signals
- comparator
- Prior art date
Links
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- Position Input By Displaying (AREA)
- Electronic Switches (AREA)
Abstract
A photo coupling signal detection circuit (30) in a computer mouse includes a comparator (32), a signal level logic circuit (34), and a signal level register bank (36). The comparator (32) compares the phototransistor voltage signals with reference signals to generate digital signals that indicate the motion of the mouse. The comparator (32) also compares the phototransistor voltage signals with corresponding maximum and minimum signals stored in the signal level register bank (36). If a voltage signal is outside the range, the signal level logic circuit (34) adjusts the corresponding maximum or minimum signal level. Then, the corresponding reference signal level is updated and calculated as the average of the maximum and minimum signal levels. A mouse with the photo coupling detection signal circuit (30) can perform with high reliability without matched photodiodes and phototransistors.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW94134437A TWI329830B (en) | 2005-10-03 | 2005-10-03 | A photo coupling detection circuit and computer designation device and method of photo coupling detection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW94134437A TWI329830B (en) | 2005-10-03 | 2005-10-03 | A photo coupling detection circuit and computer designation device and method of photo coupling detection |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200715174A true TW200715174A (en) | 2007-04-16 |
TWI329830B TWI329830B (en) | 2010-09-01 |
Family
ID=45074525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW94134437A TWI329830B (en) | 2005-10-03 | 2005-10-03 | A photo coupling detection circuit and computer designation device and method of photo coupling detection |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI329830B (en) |
-
2005
- 2005-10-03 TW TW94134437A patent/TWI329830B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
TWI329830B (en) | 2010-09-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |