US4961009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current-voltage converting circuit utilizing CMOS-type transistor
Assignee: MagnaChip Semiconductor Ltd
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Filing: 1989-06-20
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Granted: 1990-10-02
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Expires: 2009-06-20
Abstract
Abstract A current-voltage converting circuit applicable to a linear integrated circuit of CMOS-type having a wide-ranged operational voltage, comprising a buffer circuit for buffering and amplifying a current being input to an input terminal; a gain circuit for outputting a voltage in proportion to the output voltage of the buffer circuit; and a current reference circuit constituted in a current mirror by P-channel transistors; N-channel transistors and a reference voltage and is adapted to supply a constant voltage to gates of P-channel transistors provided in the gain circuit.
Inventors
- 👤 Woo H. Baik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:40
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/24; G05F3/242; G05F3/247; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/561
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A current-voltage converting circuit utilizing a CMOS-type transistor, which comprises: a buffer circuit (11) which is composed of resistors (R 1 , R 2 ) and N-channel transistors (N 1 ,N 2 ,N 5 ) and buffers and amplifies a current being input to an input terminal (I in ); a gain circuit (12) which is constituted in a 2-step inverter form so as to have a current source load by P-channel transistors (P 1 ,P 2 ) and N-channel transistors (N 3 ,N 4 ) and outputs a voltage in proportion to the output voltage of said buffer circuit (11) and feedbacks the output voltage to gates of N-channel transistors (N 2 ,N 5 ) of said buffer circuit (11); and a current reference circuit (13) which is constituted in a current mirror by P-channel transistors (P 3 ,P 4 ), N-channel transistors (N 6 ,N 7 ) and a reference voltage (V ref ) and supplies a constant voltage to gates of the P-channel transistors (P 1 ,P 2 ) of the gain circuit (12).
Claim 2
Dependent Claim
177 words
A current-voltage converting circuit utilizing a CMOS-type transistor, which comprises: a buffer circuit (11) which is composed of resistors (R 1 , R 2 ) and N-channel transistors (N 1 ,N 2 ,N 5 ) and buffers and amplifies a current being input to an input terminal (I in ); a gain circuit (12) which is constituted in a 2-step inverter form so as to have a current source load by P-channel transistors (P 1 ,P 2 ) and N-channel transistors (N 3 ,N 4 ) and outputs a voltage in proportion to the output voltage of said buffer circuit (11) and feedbacks the output voltage to gates of N-channel transistors (N 2 ,N 5 ) of said buffer circuit (11); and a current reference circuit (13) which is constituted in a current mirror by P-channel transistors (P 3 ,P 4 ), N-channel transistors (N 6 ,N 7 ) and a reference voltage (V ref ) and supplies a constant voltage to gates of the P-channel transistors (P 1 ,P 2 ) of the gain circuit (12).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |