EP1020989A2
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EP
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Temperature compensated amplifier and operating method
Assignee: Raytheon Co
•
Filing: 1999-12-13
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Granted: —
•
Expires: 2019-12-13
Abstract
Abstract An amplifier (10) is formed on an integrated circuit chip (12) and has a plurality of serially coupled amplifier stages (14 1 to 14 6 ). The stages (14 1 to 14 6 ) have an uncompensated gain which decreases with increasing temperature. Each one of a series (14 2 to 14 5 ) of these stages includes a feedback circuit (RF/10, RF,16) having a switchable feedback element (16), providing the stage with a first gain when the switchable element (16) is switched into one state and a second gain when switchable element (16) is switched into a second state. Temperature compensation circuitry (19, 20, 22) switches the switchable element (16) into one of the states selectively in accordance with the temperature of the chip (12), which is sensed by a thermometer (19) included in the temperature compensation circuitry. Each stage of the said series has a higher gain at a temperature above a predetermined threshold temperature associated with the stage and a lower gain at temperature below the predetermined threshold temperature associated with the stage, and each such stage is associated with a different predetermined threshold temperature (T 1 , T 2 , T 3 , T 4 ). In the feedback circuit of a stage, the switchable element (16) is operable to either shunt another feedback element (RF/10) or un-shunt such element. The stage provides a first gain when such element (RF/10) is shunted by the switchable element (16) and a second gain when the feedback (RF/10) is un-shunted by the switchable element.
Inventors
- 👤 Miles E. Goff
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/306
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
48 words
An amplifier, comprising: an integrated circuit chip having formed
thereon: a plurality of serially coupled amplifier
stages, each one of such stages having temperature
compensation circuitry comprising a gain selector for
providing such stage with a discrete change in gain in
accordance with the temperature of the chip.
Claim 2
Dependent Claim
59 words
An amplifier, comprising: an integrated circuit chip adapted to operate
over a range in temperature, such chip having formed
thereon: a plurality of serially coupled amplifier
stages, each one such stages having temperature
compensation circuitry comprising a gain selector for
providing such stage with a discrete change in gain in
accordance with a different operating temperature of the
chip.
Claim 3
Dependent Claim
70 words
The amplifier recited in claim 2 wherein each
one of the stages includes a gain stage having a
switchable element, such stage providing a first gain
when such element is switched into one state and a second
gain when such element is switched into a second state,
and wherein such temperature compensation circuitry
switches such element into one of the states selectively
in accordance with the temperature of the chip.
Claim 4
Dependent Claim
100 words
The amplifier recited in claim 2 wherein each
one of the stages includes a gain stage having: a
feedback element; and a switch, such element being in
shunt with the switch, such switch being operable to
either shunt such element or un-shunt such element, such
stage providing a first gain when such element is shunted
by the switch and a second gain when such element is un-shunted
by such switch, and wherein such temperature
compensation circuitry places such switch is a condition
to either shunt such element or un-shunt such element
selectively in accordance with the temperature of the
chip.
Claim 5
Dependent Claim
105 words
An amplifier having an uncompensated gain
which decreases with increasing temperature, comprising: an integrated circuit chip having formed
thereon: a plurality of serially coupled amplifier
stages, each one of a portion of such stages having
temperature compensation circuitry comprising a gain
selector for providing such stage with a discrete change
in gain in accordance with temperature of the chip, such
stage having a higher gain at a temperature above a
predetermined threshold temperature associated with such
stage and a lower gain at temperature below such
predetermined threshold temperature associated with such
stage, each one of such stages being associated with a
different predetermined threshold temperature.
Claim 6
Dependent Claim
101 words
An amplifier having an uncompensated gain
which decreases with increasing temperature, comprising: an integrated circuit chip having formed
thereon: a plurality of serially coupled amplifier
stages, each one of a portion of such stages having
temperature compensation circuitry comprising: a plurality of selectable gains, such
gain being selected in accordance with temperature of the
chip, such stage having a higher gain at a temperature
above a predetermined threshold temperature associated
with such stage and a lower gain at temperature below
such predetermined threshold level associated with such
stage, each one of such stages being associated with a
different predetermined threshold temperature.
Claim 7
Dependent Claim
70 words
The amplifier recited in claim 6 wherein each
one of the stages includes a gain stage having a
switchable element, such stage providing a first gain
when such element is switched into one state and a second
gain when such element is switched into a second state,
and wherein such temperature compensation circuitry
switches such element into one of the states selectively
in accordance with the temperature of the chip.
Claim 8
Dependent Claim
100 words
The amplifier recited in claim 6 wherein each
one of the stages includes a gain stage having: a
feedback element; and a switch, such element being in
shunt with the switch, such switch being operable to
either shunt such element or un-shunt such element, such
stage providing a first gain when such element is shunted
by the switch and a second gain when such element is un-shunted
by such switch, and wherein such temperature
compensation circuitry places such switch is a condition
to either shunt such element or un-shunt such element
selectively in accordance with the temperature of the
chip.
Claim 9
Dependent Claim
129 words
A temperature compensated amplifier,
comprising: an integrated circuit chip having formed
thereon: a plurality of serially coupled
amplifier stages, each one of a portion of such stages
having a plurality of selectable discrete gains, such
gain being selected in accordance with a control signal
fed to such stage; a temperature sensing circuit for measuring
temperature of the chip over a range of temperatures and
for producing a temperature signal representative of the
measured temperature; a control section comprising a plurality of
comparators, each one fed by the fed temperature signal
and a different threshold signal, each one of the
threshold signals representing a different temperature in
the range of temperatures, each one of the comparators
producing the control signal for a corresponding one of
the portion of amplifier stages.
Claim 10
Dependent Claim
70 words
The amplifier recited in claim 9 wherein each
one of the stages includes a gain stage having a
switchable element, such stage providing a first gain
when such element is switched into one state and a second
gain when such element is switched into a second state,
and wherein such temperature compensation circuitry
switches such element into one of the states selectively
in accordance with the temperature of the chip.
Claim 11
Dependent Claim
100 words
The amplifier recited in claim 9 wherein each
one of the stages includes a gain stage having: a
feedback element; and a switch, such element being in
shunt with the switch, such switch being operable to
either shunt such element or un-shunt such element, such
stage providing a first gain when such element is shunted
by the switch and a second gain when such element is un-shunted
by such switch, and wherein such temperature
compensation circuitry places such switch is a condition
to either shunt such element or un-shunt such element
selectively in accordance with the temperature of the
chip.
Claim 12
Independent Claim
76 words
A method for operating an amplifier,
comprising: providing an integrated circuit chip having
formed thereon: a plurality of serially coupled amplifier
stages, each one of such stages having temperature
compensation circuitry; and a gain selector for providing
such stage with a discrete change in gain in accordance
with the temperature of the chip; measuring the temperature of the chip; and changing the gain provided by the gain
selector in accordance with the temperature of the chip.
Claim 13
Independent Claim
87 words
A method for operating an amplifier,
comprising: providing an integrated circuit chip adapted
to operate over a range in temperature, such chip having
formed thereon: a plurality of serially coupled amplifier
stages, each one such stages having temperature
compensation circuitry comprising a gain selector for
providing such stage with a discrete change in gain in
accordance with a different operating temperature of the
chip; measuring the temperature of the chip; and changing the gain provided by the gain
selector in accordance with the temperature of the chip.
Claim 14
Dependent Claim
67 words
The method amplifier recited in claim 13
wherein each one of the stages includes a gain stage
having a switchable element, such stage providing a first
gain when such element is switched into one state and a
second gain when such element is switched into a second
state, including the step of: operating such temperature compensation
circuitry switches selectively in accordance with the
temperature of the chip.
Claim 15
Dependent Claim
102 words
The amplifier recited in claim 13 wherein
each one of the stages is provided with a gain stage
having: a feedback element; and a switch, such element
being in shunt with the switch; and operating such switch to either shunt such
element or un-shunt such element, such stage providing a
first gain when such element is shunted by the switch and
a second gain when such element is un-shunted by such
switch, and wherein such temperature compensation
circuitry places such switch is a condition to either
shunt such element or un-shunt such element selectively
in accordance with the temperature of the chip.
Claim 16
Independent Claim
133 words
A method for operating an amplifier having
an uncompensated gain which decreases with increasing
temperature, comprising: providing an integrated circuit chip having
formed thereon: a plurality of serially coupled amplifier
stages, each one of a portion of such stages having
temperature compensation circuitry comprising a gain
selector for providing such stage with a discrete change
in gain in accordance with temperature of the chip, such
stage having a higher gain at a temperature above a
predetermined threshold temperature associated with such
stage and a lower gain at temperature below such
predetermined threshold temperature associated with such
stage, each one of such stages being associated with a
different predetermined threshold temperature; measuring the temperature of the chip; and changing the gain provided by the gain
selector in accordance with the temperature of the chip.
References Cited (Backward Citations)
No citation records indexed.
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