US5047670A
Expired / Lapsed
US
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BiCMOS TTL input buffer
Assignee: Texas Instruments Inc
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Filing: 1990-09-06
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Granted: 1991-09-10
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Expires: 2010-09-06
Abstract
Abstract A threshold control BiCMOS TTL input buffer is disclosed which substantially eliminates input trip point variation across power supply, process, and temperature and additionally minimizes buffer power dissipation.
Inventors
- 👤 Hiep V. Tran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:43
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/094; H03K19/0944; H03K19/09448; H03K19/003; H03K19/00369
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A circuit comprising: an operational amplifier; a threshold inverter coupled to said operational amplifier; a first stage inverter; a control circuit coupling said threshold inverter to said first stage inverter, whereby said first stage inverter receives a selected voltage, controlled by said control circuit, from said threshold inverter; and a second stage inverter coupled to said first stage inverter.
Claim 2
Dependent Claim
59 words
A circuit comprising: an operational amplifier; a threshold inverter coupled to said operational amplifier; a first stage inverter; a control circuit coupling said threshold inverter to said first stage inverter, whereby said first stage inverter receives a selected voltage, controlled by said control circuit, from said threshold inverter; and a second stage inverter coupled to said first stage inverter.
Claim 3
Dependent Claim
15 words
The circuit as recited in claim 1, wherein said control circuit comprises a current mirror.
Claim 4
Dependent Claim
18 words
The circuit as recited in claim 1, further comprising a band-gap reference circuit coupled to said operational amplifier.
References Cited (Backward Citations)
US4430582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |