Multiple path amplifier with pre-cancellation
AssigneeFreescale Semiconductor, Inc.
InventorsSarmad K. Musa, Ramanujam Srinidhi Embar
Life of this patent
Estimating the term…
Abstract
A device includes a first amplifier coupled to a first signal conduction path and a second amplifier coupled to a second signal conduction path. A first coupler is coupled to the first signal conduction path. The first coupler is configured to produce an output signal based on a first signal carried by the first signal conduction path. A delay element is configured to impose a phase delay on the output signal of the first coupler to generate a delayed output signal. The device includes a second coupler coupled to the second signal conduction path. The second coupler is connected to the delay element and configured to inject the delayed output signal into the second signal conduction path.
Claims20
A multiple-path amplifier, comprising:
- a power splitter configured to receive a radio frequency input signal;
- a first amplifier coupled to a first output of the power splitter by a first signal conduction path, the first amplifier configured to receive a first signal from the power splitter;
- a second amplifier coupled to a second output of the power splitter by a second signal conduction path, the second amplifier configured to receive a second signal from the power splitter;
- a directional coupler coupled to the first signal conduction path, the directional coupler configured to couple electromagnetic energy from the first signal conduction path into an output signal;
- a delay element configured to impose a phase delay on the output signal of the directional coupler to generate a delayed output signal, wherein the phase delay imposed by the delay element is configured to make the delayed output signal antiphase, at a location along the second signal conduction path, to the signal induced in the second path by the first signal in the first path;
- and
- a coupler coupled to the second signal conduction path, the coupler being connected to the delay element and configured to inject the delayed output signal into the second signal conduction path.
A packaged device, comprising:
- a first amplifier coupled to a first signal conduction path;
- a second amplifier coupled to a second signal conduction path;
- a first coupler coupled to the first signal conduction path, the first coupler configured to produce an output signal based on a first signal carried by the first signal conduction path;
- a delay element configured to impose a phase delay on the output signal of the first coupler to generate a delayed output signal;
- and
- a second coupler coupled to the second signal conduction path, the second coupler being connected to the delay element and configured to inject the delayed output signal into the second signal conduction path to at least partially destructively interfere with a first induced signal that is induced in the second signal conduction path by the first signal carried by the first signal conduction path.
(canceled)
(canceled)
A device, comprising:
- an adjustable directional coupler configured to couple to a first signal conduction path of an amplifier, the adjustable directional coupler configured to produce an output signal based on a first signal in the first signal conduction path of the amplifier, wherein a magnitude of the output signal is determined by a coupling factor of the adjustable directional coupler;
- an adjustable delay element configured to impose a phase delay on the output signal of the adjustable directional coupler to generate a delayed output signal;
- a coupler configured to couple to a second signal conduction path of the amplifier, the coupler being connected to the adjustable delay element and configured to inject the delayed output signal into the second signal conduction path;
- and
- a controller configured to:
- detect a first output of at least one of a first amplifier coupled to the first path and a second amplifier coupled to the second path;
- and
- modify at least one of the coupling factor of the adjustable directional coupler and the phase delay of the adjustable delay element based upon the first output of the at least one of the first amplifier and the second amplifier.
Dependencies are inferred from the claim text.