US4668875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveshaping circuit
Assignee: Mitsubishi Electric Corp
•
Filing: 1986-04-08
•
Granted: 1987-05-26
•
Expires: 2006-04-08
Abstract
Abstract A waveshaping circuit for providing logic levels from a voltage source to a digital circuit comprising a pull-up (or pull-down) resistor for converting the voltage source into voltage signals of predetermined values, a low-pass filter connected to the resistor for eliminating noise components of the voltage signals, a voltage limiter for limiting the voltage signals to a predetermined voltage range, and a voltage divider for receiving and dividing the voltage signals to supply output voltages of high or low logic levels to the digital circuit.
Inventors
- 👤 Masaaki Miyazaki
- 👤 Mitsuaki Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:57
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/125; H03K5/1252; H03K5/1254
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A waveshaping circuit for providing high and low logic levels from a voltage source to a digital circuit comprising means for converting said voltage source into voltage signals of predetermined values, a low-pass filter connected to said converting means for eliminating noise components of said voltage signals, a voltage limiter for limiting said voltage signals to a predetermined voltage range covering both the high and low logic levels, and a voltage divider for receiving and dividing said voltage signals to supply output voltages corresponding to high or low logic levels to the digital circuit.
Claim 2
Dependent Claim
94 words
A waveshaping circuit for providing high and low logic levels from a voltage source to a digital circuit comprising means for converting said voltage source into voltage signals of predetermined values, a low-pass filter connected to said converting means for eliminating noise components of said voltage signals, a voltage limiter for limiting said voltage signals to a predetermined voltage range covering both the high and low logic levels, and a voltage divider for receiving and dividing said voltage signals to supply output voltages corresponding to high or low logic levels to the digital circuit.
Claim 3
Dependent Claim
39 words
A waveshaping circuit according to claim 1, wherein said voltage limiter comprises a first diode for providing an upper limit of said predetermined voltage range and a second diode for providing a lower limit of said predetermined voltage range.
Claim 4
Dependent Claim
15 words
A waveshaping circuit according to claim 1 wherein said voltage limiter comprises a Zener diode.
Claim 5
Dependent Claim
14 words
A waveshaping circuit according to claim 1 wherein said converting means includes a resistor.
References Cited (Backward Citations)
US3403265A
Cited
US3484702A
Cited
US3648195A
Cited
US3790894A
Cited
US3798559A
Cited
US3914735A
Cited
US4216653A
Cited
US4536667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |