Modulation calibration circuit and method
A technology for calibrating and adjusting circuits, which is applied in the electronic field, can solve the problem of high difficulty in calibrating circuit design, and achieve the effect of reducing difficulty
Active Publication Date: 2022-02-15
ZHONGXING LIANHUA TECH BEIJING CO LTD
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[0003] The present invention provides a modulation calibration circuit and method to solve the interference to the detection result when the IQ baseband signal needs to be considered in the prior art, and it is necessary to measure the absolute accuracy of the output signal of the IQ modulator, so the calibration circuit Defects with high design difficulty
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[0062] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0063] The ideal model of the IQ modulator is as Figure 5 As shown, the local oscillator signal sin(w C t) Two signals with a phase difference of 90° are generated by the quadrature phase-shifting network and sent to the two mixers respectively, sin(w C t) becomes sin(w after the phase change of 90° C t+pi / 4)=-cos(w C t); I(t) road signal and sin(w C t) produces I(t) sin(w) after mixing...
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The invention provides a modulation calibration circuit and method. The modulation calibration circuit includes: a calibration source generating circuit; a gain adjusting circuit; and a DC bias adjusting circuit. The calibration source generation circuit is used for generating an I-path calibration source and a Q-path calibration source, and each of the I-path calibration source and the Q-path calibration source at least comprises two voltages with different amplitudes; the input end of the gain adjustment circuit is electrically connected with the output end of the calibration source generation circuit, and the gain adjustment circuit is used for performing gain adjustment on the I-path calibration source and the Q-path calibration source; and the input end of the direct current bias adjusting circuit is electrically connected with the output end of the gain adjusting circuit, and the direct current bias adjusting circuit is used for conducting direct current bias adjustment on the I-path calibration source and the Q-path calibration source which are subjected to gain adjustment. The defects that in the prior art, interference on a detection result is caused when an IQ base band is provided with a signal, absolute accuracy of an output signal of an IQ modulator needs to be measured, and therefore the design difficulty of a calibration circuit is high are overcome.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a modulation calibration circuit and method. Background technique [0002] Existing calibration methods usually need to input IQ baseband signals to calibrate the IQ modulator. If the output of the IQ modulator needs to ignore the influence of the IQ baseband signal itself, a filter needs to be used for filtering. It is difficult to achieve full bandwidth for ultra-wideband IQ modulators. Filtering, so it is difficult to achieve self-closed-loop calibration during calibration, and often requires external spectrum analyzers and other test equipment to calibrate the IQ modulator. That is, the existing calibration method needs to consider the interference to the detection result brought by the IQ baseband signal, and needs to measure the absolute accuracy of the output signal of the IQ modulator, so the design of the calibration circuit is difficult. Contents of the invention ...
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IPC IPC(8): H04B17/11H04L25/06
CPCH04B17/11H04L25/06
Inventor 尹项托张斌程军强杨胜领
Owner ZHONGXING LIANHUA TECH BEIJING CO LTD