Patent US5168243A successfully refreshed from Google Patents.
US5168243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated high gain amplifier
Assignee: Analog Devices International ULC
•
Filing: 1991-02-06
•
Granted: 1992-12-01
•
Expires: 2011-02-06
Abstract
Abstract An integrated high gain amplifier in which voltage at the high impedance output node is sensed by sensing voltage excursions which are proportional to the output voltage at another point in the circuit which is coupled to the output node to boost the gain of the amplifier.
Inventors
- 👤 George F. Feliz
- 👤 Carl T. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:10
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
In an amplifier circuit having a high impedance node a circuit including a transistor with its collector coupled to said high impedance node, and a sense circuit for sensing the emitter base voltage of said transistor and generating a correction current which is coupled to said high impedance node to boost the gain of the amplifier.
Claim 2
Dependent Claim
56 words
In an amplifier circuit having a high impedance node a circuit including a transistor with its collector coupled to said high impedance node, and a sense circuit for sensing the emitter base voltage of said transistor and generating a correction current which is coupled to said high impedance node to boost the gain of the amplifier.
Claim 3
Dependent Claim
65 words
An amplifier comprising an input stage providing differential drive signals, a differential amplifier circuit connected to receive said drive signals and drive a high impedance node, means for sensing change in voltage at said high impedance node and providing a current to said high impedance node to compensate for the change of current due to the change in voltage sensed at said high impedance node.
Claim 4
Dependent Claim
65 words
An amplifier comprising an input stage providing differential drive signals, a differential amplifier circuit connected to receive said drive signals and drive a high impedance node, means for sensing change in voltage at said high impedance node and providing a current to said high impedance node to compensate for the change of current due to the change in voltage sensed at said high impedance node.
Claim 5
Dependent Claim
93 words
An amplifier comprising an input stage providing differential drive signals, a differential amplifier circuit connected to receive said drive signals and drive a high impedance node, means for sensing change in voltage at said high impedance node and providing a current to compensate for the change of current due to the change in voltage sensed at said high impedance node, and wherein said means for sensing the change in voltage at the high impedance node comprises a differential amplifier serving to control the current from a source coupled to said high impedance node.
Claim 6
Dependent Claim
93 words
An amplifier comprising an input stage providing differential drive signals, a differential amplifier circuit connected to receive said drive signals and drive a high impedance node, means for sensing change in voltage at said high impedance node and providing a current to compensate for the change of current due to the change in voltage sensed at said high impedance node, and wherein said means for sensing the change in voltage at the high impedance node comprises a differential amplifier serving to control the current from a source coupled to said high impedance node.
Claim 7
Dependent Claim
101 words
An amplifier comprising an input stage providing differential drive signals, a differential amplifier circuit connected to receive said drive signals and drive a high impedance node, means for sensing change in voltage at said high impedance node and providing a current to compensate for the change of current due to the change in voltage sensed at said high impedance node. wherein said means for sensing change in voltage at the high impedance node comprises a differential amplifier serving to control the current from a source coupled to said high impedance node, and wherein the current is determined by a pinch resistor.
Claim 8
Dependent Claim
101 words
An amplifier comprising an input stage providing differential drive signals, a differential amplifier circuit connected to receive said drive signals and drive a high impedance node, means for sensing change in voltage at said high impedance node and providing a current to compensate for the change of current due to the change in voltage sensed at said high impedance node. wherein said means for sensing change in voltage at the high impedance node comprises a differential amplifier serving to control the current from a source coupled to said high impedance node, and wherein the current is determined by a pinch resistor.
Claim 9
Dependent Claim
133 words
In an amplifier circuit having a high impedance node a circuit including a transistor with its collector coupled to said high impedance node, a sense circuit for sensing the emitter base voltage of said transistor and generating a correction current which is coupled to said high impedance node to boost the gain of the amplifier, and said amplifier circuit comprises a pair of cascode devices, one of which feeds the high impedance node and whose emitter tracks the high impedance node and an emitter coupled pair of transistors whose bases are connected to sense the voltage at the emitters of said pair of cascode devices and whose emitters have a current which tracks the impedance of the high impedance node and whose collectors feed currents which are coupled to the high impedance node.
Claim 10
Dependent Claim
133 words
In an amplifier circuit having a high impedance node a circuit including a transistor with its collector coupled to said high impedance node, a sense circuit for sensing the emitter base voltage of said transistor and generating a correction current which is coupled to said high impedance node to boost the gain of the amplifier, and said amplifier circuit comprises a pair of cascode devices, one of which feeds the high impedance node and whose emitter tracks the high impedance node and an emitter coupled pair of transistors whose bases are connected to sense the voltage at the emitters of said pair of cascode devices and whose emitters have a current which tracks the impedance of the high impedance node and whose collectors feed currents which are coupled to the high impedance node.
Claim 11
Dependent Claim
26 words
An amplifier as in claim 1 whose correction current is fed to a low impedance node in the circuit that couples to the high impedance node.
References Cited (Backward Citations)
USRE31545E
Cited
US4672326A
Cited
US4839609A
Cited
US4829266A
Cited
US4755767A
Cited
US5028882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-01 | 1996-06-01 | 1996-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-01 | 2000-06-01 | 2000-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-01 | 2004-06-01 | 2004-12-01 | $7700.00 | Window Closed / Lapsed |