CN210640910U

CN210640910U - I/Q modulation module

Info

Publication number: CN210640910U
Application number: CN201921903522.7U
Authority: CN
Inventors: 夏一生; 沈喜生
Original assignee: Jiangsu Shengjia Microelectronics Technology Co Ltd
Current assignee: Jiangsu Shengjia Microelectronics Technology Co Ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-05-29
Anticipated expiration: 2029-11-06

Abstract

The utility model discloses an I/Q modulation module, which comprises a switch circuit A, wherein the output end of the switch circuit A is respectively connected with a differential single-ended A input end and a low-pass filter circuit input end, and the output end of the low-pass filter circuit is sequentially connected with an attenuation control circuit B and a switch circuit B; the input of modulator is connected to differential single-ended A output, and differential single-ended A, differential single-ended B and local oscillator LO input are connected respectively to the input of modulator, and attenuation control circuit A, switch filter circuit and switch circuit B are connected gradually to the output of modulator, the utility model provides an I/Q modulation module reaction rate is fast, and output signal's stability is relatively poor.

Description

I/Q modulation module

Technical Field

The utility model relates to a modulator technical field especially relates to an I/Q modulation module.

Background

The IQ modulation is that data is divided into two paths, carrier modulation is respectively carried out, and the two paths of carriers are mutually orthogonal. I: in-phase, q: quadrature. IQ modulation is the problem of vector direction, and in-phase is the signal with the same vector direction; the quadrature component is the two signal vectors are orthogonal (90 ° difference); the IQ signals are two paths of orthogonal signals, one path is 0 ° or 180 °, the other path is 90 ° or 270 °, and the paths are called I path and Q path. Since I and Q are in quadrature (incoherent) in phase, they can be viewed as two signals. The spectrum utilization is doubled compared to single phase modulation. But IQ demodulation requires more than a single phase (must be strictly 90 degrees integer times different from I, otherwise the Q signal will mix into I, which will also mix into Q). In brief, data is divided into two paths, and carrier modulation is performed on the two paths of data respectively, and the two paths of carriers are orthogonal to each other. The orthogonal signals are two paths of carriers with the same frequency and 90-degree phase difference, and are generally transmitted together after being modulated by sin and cos and I and Q paths of signals respectively, so that the frequency spectrum utilization rate is improved. In the prior art, an I/Q modulation module has low reaction speed and poor stability of an output signal.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model discloses the technical scheme who adopts as follows:

an I/Q modulation module comprises a switch circuit A, wherein the output end of the switch circuit A is respectively connected with the input end of a differential single-end controller A and the input end of a low-pass filter circuit, and the output end of the low-pass filter circuit is sequentially connected with an attenuation control circuit B and a switch circuit B; the output end of the modulator is connected with the input end of the modulator, the input end of the modulator is respectively connected with the differential single-end controller A, the differential single-end controller B and the local oscillator LO input end, and the output end of the modulator is sequentially connected with the attenuation control circuit A, the switch filter circuit and the switch circuit B.

Further, the input of the A input end of the switch circuit is Q⁺Signal, said Q⁺Sum of signals Q^-Inputting the signals into a differential single-end controller A together to obtain Q-path signals;

further, the input of the differential single-ended B input end is I⁺Signal of said I⁺Signal sum I^-The signals are input into a differential single-end controller B together to obtain a path I signal;

further, the frequency of the local oscillator signal is: 2 to 20 GHz; power of local oscillation signal: 0-5 dBm.

The utility model has the advantages that:

the I/Q modulation module divides a Q path signal into two channels, wherein the first channel is that the Q path signal and the I path signal sequentially pass through a modulator, attenuation control and switch filtering processing together to realize a broadband IQ modulation function; second bar is connected with Q^-After the signals are sequentially subjected to low-pass filtering and attenuation control processing, the signals and the first signal are processed through a switch circuit together to obtain output signals, and broadband amplitude control is achieved. Meanwhile, the I/Q modulation module has the advantages of strong data processing capability, strong modulation signal output stability and the like.

Drawings

Fig. 1 is a schematic block diagram of a modulator according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

An I/Q modulation module designed in the present application, as shown in fig. 1, includes a switch circuit a, an output terminal of the switch circuit a is connected to an input terminal of a differential single-ended controller a and an input terminal of a low-pass filter circuit, respectively, and an output terminal of the low-pass filter circuit is connected to an attenuation control circuit B and a switch circuit B in sequence; the output end of the modulator is sequentially connected with the attenuation control circuit A, the switch filter circuit and the switch circuit B.

I⁺Signal sum I^-The signals are input into a differential single-end controller B together to obtain a path I signal; i path signal input modulator; q⁺Sum of signals Q^-Inputting the signals into a differential single-end controller A together to obtain Q-path signals; q path signal is input into the modulator; wherein, I⁺Signal, I^-Signal, Q⁺Sum of signals Q^-The signal is a modulation signal, and the frequency is: DC-2 GHz, power: -20 to-10 dBm.

The frequency of the local oscillator signal is: 2 to 20 GHz; power of local oscillation signal: 0-5 dBm. The local oscillation signal, the I path signal and the Q path signal are input into a modulator,

the I/Q modulation module divides a Q path signal into two channels, wherein the first channel is that the Q path signal and the I path signal sequentially pass through a modulator, attenuation control and switch filtering processing together to realize a broadband IQ modulation function; second bar is connected with Q^-After the signals are sequentially subjected to low-pass filtering and attenuation control processing, the signals and the first signal are processed together through the switch circuit to obtain an output signal, so that a broadband amplitude control function can be realized, and meanwhile, the data processing capacity is improved.

The above embodiments are only used for illustrating the design ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all the equivalent changes or modifications made according to the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. An I/Q modulation module is characterized by comprising a switch circuit A, wherein the output end of the switch circuit A is respectively connected with the input end of a differential single-end controller A and the input end of a low-pass filter circuit, and the output end of the low-pass filter circuit is sequentially connected with an attenuation control circuit B and a switch circuit B; the output end of the modulator is connected with the input end of the modulator, the input end of the modulator is respectively connected with the input ends of the differential single-end controller A, the differential single-end controller B and the local oscillator LO, and the output end of the modulator is sequentially connected with the attenuation control circuit A, the switch filter circuit and the switch circuit B.

2. The I/Q modulation module of claim 1, wherein the input to the A input of the switching circuit is Q⁺Signal, said Q⁺Sum of signals Q^-The signals are input into the differential single-end controller A together to obtain Q-path signals.

3. The I/Q modulation module of claim 1, wherein the input of the differential single-ended B input is I⁺Signal of said I⁺Signal sum I^-The signals are input into a differential single-end controller B together to obtain a path I signal.

4. The I/Q modulation module according to claim 1, wherein the frequency of the local oscillator signal is: 2 to 20 GHz; power of local oscillation signal: 0-5 dBm.