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Receiver

A receiver and signal receiving technology, applied in the field of receivers, can solve the problems of poor detection accuracy, inability to perform accurate phase correction, difficulty in ensuring phase error accuracy, etc., achieve accurate amplitude correction, and improve the effect of removal

Inactive Publication Date: 2009-05-13
NSC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the detection accuracy of the phase error is poor, the phase difference between the I signal and the Q signal cannot be made exactly 90°
As described in Patent Document 1, for example, in order to secure an image removal ratio of approximately 60 dB or higher, the phase error needs to be within approximately 0.05°. However, it is difficult to ensure the accuracy for detecting such a small phase error.
Therefore, there is a problem that accurate phase correction cannot be performed

Method used

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no. 1 example

[0050] Next, a first embodiment of the present invention will be described based on the drawings. Fig. 1 shows an example of the structure of a receiver of the first embodiment. As shown in Figure 1, the receiver according to the first embodiment includes: receiving antenna 1; LNA2; polyphase filter (PPF) 3; mixers 4I, 4Q; local oscillator 5; 90° phase shifter 6; switchers 7I, 7Q; LPFs 8I, 8Q; A / D converters 9I, 9Q; IF signal generation section 10; Among the respective configurations shown in FIG. 1 , the configurations other than the receiving antenna 1 can all be integrated into one chip by, for example, a CMOS (Complementary Metal Oxide Semiconductor) process.

[0051] The LNA 2 amplifies the high-frequency signal received by the receiving antenna 1 and supplies it to the PPF 3 . The PPF 3 filters the high-frequency signal output from the LNA 2 in a desired frequency band, extracts a signal in a predetermined frequency band including a desired reception frequency, and out...

no. 2 example

[0070] Next, a second embodiment of the present invention will be described based on the drawings. Fig. 2 shows an example of the structure of a receiver of the second embodiment. In addition, in this FIG. 2 , elements having the same symbols as those shown in FIG. 1 have the same functions, and repeated explanations are omitted here.

[0071] As shown in Figure 2, the receiver of the second embodiment includes: receiving antenna 1; LNA 2; PPF 3; mixers 4I and 4Q; local oscillator 5; 90° phase shifter 6; switcher 7; LPF 8I and 8Q; A / D converters 9I and 9Q; mirror signal generating section 21; phase correcting section 22; and DSP 23. Moreover, among the respective constituent elements shown in FIG. 2 , other constituent elements other than the receiving antenna 1 may all be integrated into 1 chip using, for example, a CMOS process.

[0072] The image signal generator 21 generates a signal of an image frequency determined by the relationship between the reception frequency of ...

no. 3 example

[0093] Next, a third embodiment of the present invention will be described based on the drawings. Fig. 3 shows an example of the structure of the receiver of the third embodiment. In addition, in FIG. 3 , elements having the same reference numerals as those shown in FIGS. 1 and 2 have the same functions, and thus repeated descriptions are omitted here. The third embodiment combines the functions described in the first embodiment and the functions described in the second embodiment.

[0094] As shown in FIG. 3 , in the case of the receiver of the third embodiment, instead of providing the phase correcting unit 22 at the rear end of the 90° phase shifter 6, a phase correcting unit 42 is provided as the processing function of the DSP 41, according to the The correction amount set by the phase error correction processing section 27 corrects the phase of the I signal processed by the first signal processing system. Of course, it is also possible to provide a phase correction unit...

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Abstract

There are provided an IF signal generating portion 10 for generating an intermediate frequency signal, and an amplitude error correcting portion 15 for setting a gain of an amplitude correcting portion 12 to eliminate an amplitude error between a signal processed by a first signal processing system for an I signal and a signal processed by a second signal processing system for a Q signal when the intermediate frequency signal generated by the IF signal generating portion 10 is selected by switches 7I and 7Q. By correcting an amplitude error using the intermediate frequency signal generated by the IF signal generating portion 10 in place of an intermediate frequency signal generated by processing an actual received signal, it is possible to accurately detect the amplitude error without an influence of a phase error by using a signal which does not include a phase error caused by a variation in elements of mixers 4I and 4Q and a 90 DEG phase shifter 6 themselves.

Description

technical field [0001] The present invention relates to a receiver, and more particularly, the present invention is suitable for use in a receiver that uses two mixers to divide a high-frequency received signal into an in-phase component and a quadrature component for frequency conversion, Quadrature demodulation is performed using the obtained in-phase signal and quadrature signal. Background technique [0002] Normally, in order to transmit information as a wireless radio wave signal, so-called modulation processing is required to convert a baseband signal (a low-frequency signal including components near direct current) into a wireless high-frequency signal. The receiver that receives the high-frequency signal generated by the modulation process as a radio wave uses a mixer to frequency-mix the high-frequency signal received by the receiving antenna and the local oscillation signal output from the local oscillator, thereby converting it into a signal suitable for detectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/26H04B1/16
CPCH04B1/28H04L2027/0055H04L2027/0028H04L2027/003H04B1/0039H04L27/0014
Inventor 池田毅宫城弘
Owner NSC CO LTD
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