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File:Phase shifter using IQ modulator.gif

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原始檔案 (842 × 380 像素,檔案大小:1.57 MB,MIME 類型:image/gif、​循環、​72 畫格、​8.6秒)


摘要

描述
English: Phasor and wave diagram animation showing how phase change is achieved in I+Q signal by changing I (inphase cosine component) and Q (quadrature sine component) signals amplitude in IQ modulators. For Python code used to generate this image, go to the image file description page by clicking "More details" button.
日期
來源 自己的作品
作者 Vigneshdm1990

Source code Python Matplotlib

The following python code is used to generate 72 images used in this animation. Then using an online gif image maker "ezgif.com" these 72 images are combined to get gif image.

# Python code using matplotlib library to generate 72 images to create a gif file that shows
# how phase change is achieved by changing I and Q signals amplitude in IQ modulators
# 
# I- inphase Q-quadrature

# Physics concept : how by only changing the magnitude of I and Q signals amplitude
# one can change the phase of I+Q wave signal

import matplotlib.pyplot as plt
import numpy as np

# t is the current phase, and phase is changed from 0° to 355° in the steps of 5°

for t in range(0,356,5):

    # I) CREATING FUNCTION FOR PLOTTING

    # creating a blue circle in PHASOR DIAGRAM using parametric equation (radius=1, theta=s)
    s=np.linspace(0, 2 * np.pi, 400)
    x1=np.cos(s)
    y1=np.sin(s)

    # creating I and Q vectors magnitude (x=I, y=Q) in PHASOR DIAGRAM
    x = 1*np.cos(0.0174533*t)
    y = 1*np.sin(0.0174533*t)

    # creating I, Q, I+Q amplitude and Phase (0° to 720°) for WAVE DIAGRAM
    x2 = np.linspace(0, 721, 400) # Pahse from 0° to 720° divided into 400 points
    y2 = 1*np.sin(0.0174533*t)*np.sin(0.0174533*x2) # Q
    z2 = 1*np.cos(0.0174533*t)*np.cos(0.0174533*x2) # I
    q2 = (y2 + z2) # (I+Q)

    # creating text to show current phase t
    text1 = "phase = " + str(t)+'°'

    # II) CREATING THE PLOT (phasor and wave diagram in one plot arranged 1 x 2)

    # ax1 = Phasor diagram subplot and ax2 = Wave diagram subplot
    fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(9.5,4.1))
    ax1.title.set_text('Phasor diagram')
    ax2.title.set_text('Wave diagram')

    # Setting the position of the subplot title
    ax1.title.set_position([.5, 1.05])
    ax2.title.set_position([.5, 1.05])

    # II-A) PHASOR DIAGRAM

    # including the current phase inside the Phasor diagram subplot
    ax1.text(0.9, 0.9, text1, bbox=dict(boxstyle="square",facecolor='white', alpha=0.5))

    # setting the y axis limit
    ax1.set_ylim(-1, 1)

    # Plotting the blue outer circle of radius = 1
    ax1.plot(x1, y1, 'b')

    # Move left y-axis and bottom x-axis to centre, passing through (0,0)
    ax1.spines['left'].set_position('center')
    ax1.spines['bottom'].set_position('center')

    # Eliminate upper and right axes
    ax1.spines['right'].set_color('none')
    ax1.spines['top'].set_color('none')

    # Show ticks in the left and lower axes only
    ax1.xaxis.set_ticks_position('bottom')
    ax1.yaxis.set_ticks_position('left')

    # Setting the y axis ticks at (-1,-0.5,0,0.5,1)
    ax1.set_yticks([-1,-0.5,0,0.5,1])

    # Creating Arrows and dashed lines
    ax1.arrow(0, 0, x, y, length_includes_head='True', head_width=0.05, head_length=0.1, color='g') # I+Q
    ax1.arrow(0, 0, x, 0, length_includes_head='True', head_width=0.05, head_length=0.1, color='b') # I
    ax1.arrow(0, 0, 0, y, length_includes_head='True', head_width=0.05, head_length=0.1, color='r') # Q
    ax1.arrow(x, 0, 0, y, length_includes_head='True', head_width=0, head_length=0, ls='-.') # vertical dashed lines
    ax1.arrow(0, y, x, 0, length_includes_head='True', head_width=0, head_length=0, ls='-.') # Horizontal dashed lines

    # II-B) WAVE DIAGRAM

    # setting the y axis limit
    ax2.set_ylim(-1.5, 1.5)

    # Setting the y axis ticks at (0, 180, 360, 540, 720) degree phase
    ax2.set_xticks([0, 180, 360, 540, 720])

    # Setting the position of the x and y axis
    ax2.spines['left'].set_position(('axes', 0.045))
    ax2.spines['bottom'].set_position(('axes', 0.5))

    # Eliminate upper and right axes
    ax2.spines['right'].set_color('none')
    ax2.spines['top'].set_color('none')

    # Creating x and y axis label
    ax2.set_xlabel('Phase (degree)', labelpad=0)
    ax2.set_ylabel('Amplitude', labelpad=0)

    # Plotting I, Q and I+Q waves
    ax2.plot(x2, z2, 'b', label='I', linewidth=0.5)
    ax2.plot(x2, y2, 'r', label='Q', linewidth=0.5)
    ax2.plot(x2, q2, 'g', label='I+Q')

    # function for amplitude of I+Q green arrow
    c1=1 * np.cos(0.0174533 * t) * np.cos(0.0174533 * t)+1*np.sin(0.0174533*t)*np.sin(0.0174533*t)

    # plotting I+Q arrow that moves along to show the current phase
    ax2.arrow(t, 0, 0, c1, length_includes_head='True', head_width=10, head_length=0.07, color='g')

    # plotting I and Q amplitude arrows at position 180° and 90° respectively
    ax2.arrow(180, 0, 0, 1*np.cos(0.0174533*t)*np.cos(0.0174533*180), length_includes_head='True', head_width=10, head_length=0.07, color='b')
    ax2.arrow(90, 0, 0, 1*np.sin(0.0174533*t)*np.sin(0.0174533*90), length_includes_head='True', head_width=10, head_length=0.07, color='r')

    # Creating legend
    ax2.legend(loc='center', ncol=3, bbox_to_anchor=[0.5, 0.94])

    # Adjusting the relative position of the subplots inside the figure
    fig.subplots_adjust(left=0.07, bottom=0.15, right=None, top=None, wspace=0.3, hspace=None)

    # Saving the figure
    fig.savefig('0file%s.png' %t)

    # Clearing the figure for the next iteration
    fig.clf()

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說明

添加單行說明來描述出檔案所代表的內容
Animation of a phase shifter using IQ modulator. By changing the amplitude of I and Q waves one can change the phase of the I+Q wave.

在此檔案描寫的項目

描繪內容

創作作者 Chinese (Hong Kong) (已轉換拼寫)

沒有維基數據項目的某些值

維基媒體使用者名稱 繁體中文 (已轉換拼寫):​Vigneshdm1990
作者姓名字串 繁體中文 (已轉換拼寫):​Vigneshdm1990

著作權狀態 繁體中文 (已轉換拼寫)

有著作權 繁體中文 (已轉換拼寫)

共享創意署名-相同方式共享4.0國際 Chinese (Hong Kong) (已轉換拼寫)

檔案來源 Chinese (Taiwan) (已轉換拼寫)

上傳者的原創作品 繁體中文 (已轉換拼寫)

多媒體型式 繁體中文 (已轉換拼寫)

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