US 8,786,372 B2Granted

Dual primary switched transformer for impedance and power scaling

AssigneeRF Micro Devices, Inc.

InventorsWayne D. Tattershall, David E. Jones

Life of this patent

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Abstract

This application reduces the power of series combined transformers and of parallel combined transformers while maintaining efficiency. In one embodiment, a series combined transformer is provided with a switch between a first primary inductor and a second primary inductor, in order to provide at least two modes. In a high power mode, the switch is open and the series combined transformer operates normally. In a low power mode, the switch is closed, one amplifier from a first differential amplifier pair is shut down, one amplifier from a second differential pair is shut down, and the series combined transformer operates efficiently in a low power mode.

Claims25

Dependent claims

A combined transformer comprising:

a first differential amplifier pair comprising a first positive amplifier and a first negative amplifier, and configured such that the output of the first positive amplifier is about 180 degrees out of phase with the output of the first negative amplifier;
a first primary inductor linking the output of the first positive amplifier to the output of the first negative amplifier;
a second differential pair comprising a second positive amplifier and a second negative amplifier, and configured such that the output of the second positive amplifier is about 180 degrees out of phase with the output of the second negative amplifier;
a second primary inductor linking the output of the second positive amplifier to the output of the second negative amplifier;
and
a switch linking the first primary inductor to the second primary inductor.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/657,300Filed 22 Oct 2012 · us provisional application
Priority: 21 Oct 2011
Published: US 2013/0099858 A125 Apr 2013
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H03F 1/0277
In transistor amplifiers: selecting one or more amplifiers from a plurality of amplifiers
H03F 3/211
With semiconductor devices only: using a combination of several amplifiers
H03F 3/245
Of transmitter output stages: with semiconductor devices only
H03F 2200/414
Indexing scheme relating to amplifiers: a switch being coupled in the output circuit of an amplifier to switch the output on/off

Family

Application61/550,088Us provisional application · filed 21 Oct 2011
US 2013/0099858 A1Pre-grant publication · published 25 Apr 2013
US 8,786,372 B2This patent

From the US filing history. Foreign family members aren’t listed.

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