US4450414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature current mirror amplifier
Assignee: Intersil Corp
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Filing: 1982-02-23
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Granted: 1984-05-22
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Expires: 2002-02-23
Abstract
Abstract A high temperature current mirror amplifier having biasing means in the transdiode connection of the input transistor for producing a voltage to maintain the base-collector junction reversed-biased and a current means for maintaining a current through the biasing means at high temperatures so that the base-collector junction of the input transistor remained reversed-biased. For accuracy, a second current mirror is provided with a biasing means and current means on the input leg.
Inventors
- 👤 Raymond B. Patterson, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:31
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/302; G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/26; G05F3/265; H03F3/00; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
In a current mirror amplifier having an input transistor whose collector is connected to its base in a transdiode connection, its emitter connected to a voltage supply terminal and its collector connected to an input terminal and output transistor whose base is connected to the base of said input transistor, its emitter connected to said voltage supply terminal and its collector connected to an output terminal, the improvement comprising: biasing means in said transdiode connection of said input transistor for producing a voltage to maintain the base-collector junction of said input transistor reversed-biased; and current means connected to said base of said input transistor for maintaining a current through said biasing means at high temperatures so that said biasing means produces said voltage at high temperatures, said current means being operative above a selected temperature and inoperative below said selected temperature.
Claim 2
Dependent Claim
141 words
In a current mirror amplifier having an input transistor whose collector is connected to its base in a transdiode connection, its emitter connected to a voltage supply terminal and its collector connected to an input terminal and output transistor whose base is connected to the base of said input transistor, its emitter connected to said voltage supply terminal and its collector connected to an output terminal, the improvement comprising: biasing means in said transdiode connection of said input transistor for producing a voltage to maintain the base-collector junction of said input transistor reversed-biased; and current means connected to said base of said input transistor for maintaining a current through said biasing means at high temperatures so that said biasing means produces said voltage at high temperatures, said current means being operative above a selected temperature and inoperative below said selected temperature.
Claim 3
Dependent Claim
39 words
The current mirror amplifier according to claim 1, wherein said current means includes a bipolar transistor having its collector connected to said base of said input transistor and its base and emitter connected together to said supply voltage terminal.
Claim 4
Dependent Claim
34 words
The current mirror amplifier according to claim 2, wherein the geometry of said bipolar transistor of said current means is at least half the sum of the geometries of said input and output transistors.
Claim 5
Dependent Claim
34 words
The current mirror amplifier according to claim 2, wherein the impurity concentration of the collector region of said bipolar transistor of said current means determines said selected temperature of operability of said current means.
Claim 6
Dependent Claim
146 words
The current mirror amplifier according to claim 1 including: a first emitter follower configured bipolar transistor having its collector connected to said emitter of said input transistor, its emitter connected to said voltage supply terminal and a base; a second emitter follower configured bipolar transistor having its collector connected to said emitter of said output transistor, its emitter connected to said voltage supply terminal and its base connected to said base of said first emitter follower transistor; second biasing means connected between the collector and base of said second emitter follower transistor for producing a voltage to maintain the base-collector junction of said second emitter follower transistor reverse-biased; and second current means connected to said base of said second emitter follower transistor for maintaining a current through said second biasing means at high temperatures so that said second biasing means produces said voltage at high temperatures.
Claim 7
Dependent Claim
40 words
The current mirror amplifier according to claim 5, including means connected between said base of said input transistor and said first mentioned current means for matching the characteristics of the input first mentioned current means to said second current means.
Claim 8
Dependent Claim
142 words
In a current mirror amplifier having an input transistor whose collector is connected to its base in a transdiode connection, its emitter connected to a voltage supply terminal and its collector connected to an input terminal and output transistor whose base is connected to the base of said input transistor, its emitter connected to said voltage supply terminal and its collector connected to an output terminal, the improvement comprising: biasing means in said transdiode connection of said input transistor for producing a voltage to maintain the base-collector junction of said input transistor reversed-biased; and current means connected to said base of said input transistor for maintaining a current through said biasing means, said current means comprising a bipolar transistor having its collector connected to said base of said input transistor and its base and emitter connected together to said supply voltage terminal.
Claim 9
Dependent Claim
142 words
In a current mirror amplifier having an input transistor whose collector is connected to its base in a transdiode connection, its emitter connected to a voltage supply terminal and its collector connected to an input terminal and output transistor whose base is connected to the base of said input transistor, its emitter connected to said voltage supply terminal and its collector connected to an output terminal, the improvement comprising: biasing means in said transdiode connection of said input transistor for producing a voltage to maintain the base-collector junction of said input transistor reversed-biased; and current means connected to said base of said input transistor for maintaining a current through said biasing means, said current means comprising a bipolar transistor having its collector connected to said base of said input transistor and its base and emitter connected together to said supply voltage terminal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |