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US 11,309,850 B2Granted
Cartesian feedback circuit
AssigneeMitsubishi Electric Corporation
InventorsHifumi Noto, Hiroyuki Akutsu
Life of this patent
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Abstract
It is configured to output a first I signal having passed through a first inverse characteristic circuit having inverse frequency characteristics to frequency characteristics of a first loop filter circuit, to the first loop filter circuit, and output a first Q signal having passed through a second inverse characteristic circuit having inverse frequency characteristics to frequency characteristics of a second loop filter circuit, to the second loop filter circuit.
Claims10
A Cartesian feedback circuit comprising:
- a first loop filter circuit to limit a signal band of a differential I signal, the differential I signal being a difference between a first I signal and a second I signal, the first I signal being an in-phase component of a modulated wave signal, the second I signal being an in-phase component of an amplified harmonic signal;
- a second loop filter circuit to limit a signal band of a differential Q signal, the differential Q signal being a difference between a first Q signal and a second Q signal, the first Q signal being a quadrature-phase component of the modulated wave signal, the second Q signal being a quadrature-phase component of the harmonic signal;
- a quadrature modulator to generate a harmonic signal from the signal-band-limited differential I signal and the signal-band-limited differential Q signal;
- an amplifier to amplify the harmonic signal generated by the quadrature modulator;
- a quadrature demodulator to demodulate each of the second I signal and the second Q signal from the harmonic signal amplified by the amplifier;
- a first inverse characteristic circuit having inverse frequency characteristics to frequency characteristics of the first loop filter circuit;
- and
- a second inverse characteristic circuit having inverse frequency characteristics to frequency characteristics of the second loop filter circuit, wherein
- a first digital I signal is inputted to the first inverse characteristic circuit, and a first digital Q signal is inputted to the second inverse characteristic circuit.
6 more elements
Dependencies are inferred from the claim text.