CMOS power amplifier for driving low impedance loads
First Claim
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1. A two-stage power amplifier comprising:
- a first stage transconductor;
second stage having at least two parallel output branches supplying current to an output node, each output branch has an input coupled to an output of the first stage transconductor, wherein each of the output branches comprises;
a unity gain amplifier for providing a voltage level shift; and
a second stage transconductor having an input coupled to an output of the unity gain amplifier.
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Abstract
The two-stage power amplifier includes: a first stage transconductor 60; and a second stage having at least two parallel output branches 57-59 supplying current to an output node 89, each output branch has an input coupled to an output of the first stage transconductor 60.
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Citations
5 Claims
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1. A two-stage power amplifier comprising:
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a first stage transconductor;
second stage having at least two parallel output branches supplying current to an output node, each output branch has an input coupled to an output of the first stage transconductor, wherein each of the output branches comprises;
a unity gain amplifier for providing a voltage level shift; and
a second stage transconductor having an input coupled to an output of the unity gain amplifier. - View Dependent Claims (2, 3, 4, 5)
the unity gain amplifier comprises a first transistor having a gate coupled to an output of the first stage transconductor; - and
the second stage transconductor comprises a second transistor having a gate coupled to a source of the first transistor and a drain coupled to the output node.
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4. The amplifier of claim 3 further comprising a current source coupled to the source of the first transistor.
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5. The amplifier of claim 1 further comprising a capacitor coupled between the output of the first stage transconductor and the output node.
Specification
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Current AssigneeTexas Instruments, Inc.
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Original AssigneeTexas Instruments, Inc.
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InventorsMuza, John M.
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Primary Examiner(s)Shingleton, Michael B
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Application NumberUS09/638,104Time in Patent Office655 DaysField of Search330/277,295,311US Class Current330/311CPC Class CodesH03F 1/223 with MOSFET'sH03F 3/211 using a combination of seve...H03F 3/345 with field-effect devices H...
