Phase shift and attenuation circuits for use with multiple-path amplifiers
First Claim
1. An adjustable power splitter circuit comprising:
- a power divider with a power divider input, a first power divider output, and a second power divider output, wherein the power divider is configured to divide a first radio frequency (RF) input signal received at the power divider input into first and second divided RF signals provided at the first and second power divider outputs, and the power divider is further configured to apply one or more fixed phase shifts to the first divided RF signal, the second divided RF signal, or both the first and second divided RF signals so that the first and second divided RF signals have about a ninety degree phase shift, with respect to each other, at the first and second power divider outputs;
a first circuit comprising a first input coupled to the first power divider output and configured to receive the first divided RF signal, a first output configured to provide a first RF output signal, and a first adjustable phase shifter circuit coupled between the first input and the first output, wherein the first adjustable phase shifter circuit is configured to apply a first phase shift to the first divided RF signal;
a second circuit in parallel with the first circuit, the second circuit comprising a second input coupled to the second power divider output and configured to receive the second divided RF signal, a second output configured to provide a second RF output signal, and a first variable attenuator circuit coupled between the second input and the second output, wherein the first variable attenuator circuit is configured to apply a first attenuation to the second divided RF signal; and
a controller configured to receive data indicating the first phase shift and the first attenuation, and to control, based on the data, application of the first phase shift by the first adjustable phase shifter circuit, and application of the first attenuation by the first variable attenuator circuit.
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Accused Products
Abstract
Embodiments of circuits for use with an amplifier that includes multiple amplifier paths include a first circuit and a second circuit in parallel with the first circuit. The first circuit includes a first input coupled to a first power divider output, a first output coupled to a first amplifier path of the multiple amplifier paths, and a first adjustable phase shifter and a first attenuator series coupled between the first input and the first output. The second circuit includes a second input coupled to a second power divider output, a second output coupled to a second amplifier path of the multiple amplifier paths, and a second adjustable phase shifter coupled between the second input and the second output.
30 Citations
19 Claims
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1. An adjustable power splitter circuit comprising:
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a power divider with a power divider input, a first power divider output, and a second power divider output, wherein the power divider is configured to divide a first radio frequency (RF) input signal received at the power divider input into first and second divided RF signals provided at the first and second power divider outputs, and the power divider is further configured to apply one or more fixed phase shifts to the first divided RF signal, the second divided RF signal, or both the first and second divided RF signals so that the first and second divided RF signals have about a ninety degree phase shift, with respect to each other, at the first and second power divider outputs; a first circuit comprising a first input coupled to the first power divider output and configured to receive the first divided RF signal, a first output configured to provide a first RF output signal, and a first adjustable phase shifter circuit coupled between the first input and the first output, wherein the first adjustable phase shifter circuit is configured to apply a first phase shift to the first divided RF signal; a second circuit in parallel with the first circuit, the second circuit comprising a second input coupled to the second power divider output and configured to receive the second divided RF signal, a second output configured to provide a second RF output signal, and a first variable attenuator circuit coupled between the second input and the second output, wherein the first variable attenuator circuit is configured to apply a first attenuation to the second divided RF signal; and a controller configured to receive data indicating the first phase shift and the first attenuation, and to control, based on the data, application of the first phase shift by the first adjustable phase shifter circuit, and application of the first attenuation by the first variable attenuator circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A Doherty power amplifier comprising:
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a main amplifier path; a peaking amplifier path; a power divider with a power divider input, a first power divider output, and a second power divider output, wherein the power divider is configured to divide a first radio frequency (RF) input signal received at the power divider input into first and second divided RF signals provided at the first and second power divider outputs, and the power divider is further configured to apply one or more fixed phase shifts to the first divided RF signal, the second divided RF signal, or both the first and second divided RF signals so that the first and second divided RF signals have about a ninety degree phase shift, with respect to each other, at the first and second power divider outputs; a first circuit comprising a first input coupled to the first power divider output and configured to receive the first divided RF signal, a first output configured to provide a first RF output signal, and a first adjustable phase shifter circuit coupled between the first input and the first output, wherein the first adjustable phase shifter circuit is configured to apply a first phase shift to the first divided RF signal; and a second circuit in parallel with the first circuit, the second circuit comprising a second input coupled to the second power divider output and configured to receive the second divided RF signal, a second output configured to provide a second RF output signal, and a first variable attenuator circuit coupled between the second input and the second output, wherein the first variable attenuator circuit is configured to apply a first attenuation to the second divided RF signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification