Phase shift and attenuation circuits for use with multiple-path amplifiers

  • US 10,432,148 B2
  • Filed: 02/12/2019
  • Issued: 10/01/2019
  • Est. Priority Date: 01/27/2012
  • Status: Active Grant
First Claim
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1. An adjustable power splitter circuit comprising:

  • a radio frequency (RF) input;

    first and second power outputs;

    a divider circuit configured to power divide a first RF signal received at the RF input into second and third RF signals, wherein the divider circuit is further configured to produce the second and third RF signals with a predetermined phase shift between the second and third RF signals;

    a first signal adjustment circuit coupled to the divider circuit to receive the second RF signal, wherein the first signal adjustment circuit comprises a first adjustable phase shifter circuit and a first attenuator circuit coupled in series, wherein the first attenuator circuit is a first variable attenuator circuit, wherein the first signal adjustment circuit receives the second RF signal from the divider circuit, the first adjustable phase shifter circuit applies a first phase shift to the second RF signal, and the first attenuator circuit applies a first attenuation to the second RF signal to produce a fourth RF signal at the first power output;

    a second signal adjustment circuit coupled to the divider circuit to receive the third RF signal, wherein the second signal adjustment circuit is coupled to the divider circuit in parallel with the first signal adjustment circuit, wherein the second signal adjustment circuit comprises a second adjustable phase shifter circuit and a second attenuator circuit coupled in series, wherein the second signal adjustment circuit receives the third RF signal from the divider circuit, the second adjustable phase shifter circuit applies a second phase shift to the third RF signal, and the second attenuator circuit applies a second attenuation to the third RF signal to produce a fifth RF signal at the second power output; and

    a serial data interface, wherein the adjustable power splitter circuit is configured to receive data indicating the first phase shift, the second phase shift, and the first attenuation through the serial data interface, and the adjustable power splitter circuit is further configured to control, based on the data, application of the first phase shift by the first signal adjustment circuit, application of the second phase shift by the second signal adjustment circuit, and application of the first attenuation by the first signal adjustment circuit.

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