Patent US5392003A successfully refreshed from Google Patents.
US5392003A
Expired / Lapsed
US
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Wide tuning range operational transconductance amplifiers
Assignee: Motorola Solutions Inc
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Filing: 1993-08-09
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Granted: 1995-02-21
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Expires: 2013-08-09
Abstract
Abstract A wide dynamic range Operational Transconductance Amplifier (OTA) (100) includes a differential voltage to current converter (206) for converting an input voltage to a current level. A pair of programmable folded cascodes (201) are coupled to the output of the converter (206) in order to render the amplifier (100) programmable. Current sources (222 and 226) are employed to provide output sourcing current. There is also included a common mode feedback (106) for maintaining the output signal substantially and equally centered between rails of the operating voltage (208).
Inventors
- 👤 Manbir Nag
- 👤 Joseph P. Heck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:02
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479; H03F3/45076; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/0422; H03H11/40; H03H11/42
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
128 words
A wide dynamic range tunable Operational Transconductance Amplifier (OTA) having an output and an operating voltage, comprising: a differential voltage to current converter, including: an output; at least one low noise large input swing amplifier; at least one current source coupled to the amplifier; a pair of programmable folded cascode stages each DC coupled to the output of the converter without utilizing additional coupling amplifiers, the folded cascode stages including: a common base amplifier: a programmable amplifier coupled to the common base amplifier for rendering the folded cascode stages programmable; means for maintaining the output signal substantially and equally centered between rails of the operating voltage; and a pair of current sources DC coupled to the pair of programmable folded cascode stages to provide variable output sourcing current.
Claim 2
Dependent Claim
128 words
A wide dynamic range tunable Operational Transconductance Amplifier (OTA) having an output and an operating voltage, comprising: a differential voltage to current converter, including: an output; at least one low noise large input swing amplifier; at least one current source coupled to the amplifier; a pair of programmable folded cascode stages each DC coupled to the output of the converter without utilizing additional coupling amplifiers, the folded cascode stages including: a common base amplifier: a programmable amplifier coupled to the common base amplifier for rendering the folded cascode stages programmable; means for maintaining the output signal substantially and equally centered between rails of the operating voltage; and a pair of current sources DC coupled to the pair of programmable folded cascode stages to provide variable output sourcing current.
Claim 3
Dependent Claim
90 words
An integrated low voltage wide dynamic range Operational Transconductance Amplifier (OTA), comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without additional coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage.
Claim 4
Dependent Claim
90 words
An integrated low voltage wide dynamic range Operational Transconductance Amplifier (OTA), comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without additional coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage.
Claim 5
Dependent Claim
29 words
The integrated low voltage wide dynamic range OTA of claim 2, further including means for maintaining the output signal substantially and equally centered between rails of the operating voltage.
Claim 6
Dependent Claim
23 words
The integrated low voltage wide dynamic range OTA of claim 2, further including a pair of current sources to provide output sourcing current.
Claim 7
Dependent Claim
21 words
The integrated low voltage wide dynamic range OTA of claim 2, wherein the differential programmable stage includes at least one transistor.
Claim 8
Dependent Claim
40 words
The integrated low voltage wide dynamic range OTA of claim 2, wherein the differential voltage to current converter comprises: an output; at least one low noise large input swing amplifier; and at least one current source coupled to the amplifier.
Claim 9
Dependent Claim
90 words
An integrated gyrator, comprising: at least one Operational Transconductance Amplifier (OTA), comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without additional coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage.
Claim 10
Dependent Claim
90 words
An integrated gyrator, comprising: at least one Operational Transconductance Amplifier (OTA), comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without additional coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage.
Claim 11
Dependent Claim
98 words
An integrated filter, comprising: at least one gyrator operating on a low supply voltage, comprising: at least one OTA, comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without additional coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage.
Claim 12
Dependent Claim
98 words
An integrated filter, comprising: at least one gyrator operating on a low supply voltage, comprising: at least one OTA, comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without additional coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage.
Claim 13
Dependent Claim
24 words
The integrated filter of claim 9, further including means for maintaining the output signal substantially and equally centered between rails of the operating voltage.
Claim 14
Dependent Claim
18 words
The integrated filter of claim 8, further including a pair of current sources to provide output sourcing current.
Claim 15
Dependent Claim
16 words
The integrated filter of claim 8, wherein the differential programmable stage includes at least one transistor.
Claim 16
Dependent Claim
113 words
A radio communication device, comprising: a receiver for receiving radio frequency signal; a variable bandwidth filter, comprising: at least one gyrator operating on a low supply voltage, comprising at least one OTA, comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without utilizing addition a coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage;
Claim 17
Dependent Claim
113 words
A radio communication device, comprising: a receiver for receiving radio frequency signal; a variable bandwidth filter, comprising: at least one gyrator operating on a low supply voltage, comprising at least one OTA, comprising: a differential voltage to current converter; a programmable differential folded cascode stage DC coupled to the differential voltage to current converter without utilizing addition a coupling amplifiers, including: a differential amplifier stage having a gain; a differential current source coupled to the amplifier stage; a differential programmable stage coupled to the amplifier stage and the current source for programming the gain of the amplifier stage and a pair of current sources DC coupled to the programmable differential folded cascode stage;
References Cited (Backward Citations)
US4823092A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-02-20 | 1998-08-22 | 1999-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-20 | 2002-08-22 | 2003-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-20 | 2006-08-22 | 2007-02-21 | $7700.00 | Window Closed / Lapsed |