plt.show()
#freqs = np.array([0.01, 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 25, 27, 30, 33, 35, 37, 40, 43, 45, 47, 50, 53, 55, 57, 60, 63, 65, 67, 70, 73, 75, 77, 80, 83, 85, 87, 90, 93, 95, 97, 100, 103, 105, 107, 110, 113, 115, 117, 120, 123, 124]) * 1e6
freqs = np.linspace(0.01e6, 40e6,num=200)
freqs = np.round(freqs / fs * n_pts) * fs / n_pts
hd1 = 0.0 * freqs
hd2 = 0.0 * freqs
hd3 = 0.0 * freqs
snr = 0.0 * freqs
for i, freq in enumerate(freqs):
n = np.uint32(freq / fs * n_pts)
driver.set_dds_freq(0, freq)
time.sleep(0.5)
psd = driver.read_psd()
psd_db = 10*np.log10(psd)
snr[i] = 10*np.log10(psd[n-1] / (np.sum(psd) - psd[n-1]))
hd1[i] = psd_db[n-1]
if 2*(n-1) < n_pts/2:
hd2[i] = psd_db[2*n-1] - hd1[i]
else:
hd2[i] = psd_db[n_pts - (2*n) - 1] - hd1[i]
if 3*(n-1) < n_pts/2:
hd3[i] = psd_db[3*n-1] - hd1[i]
'''
import numpy as np
import os
import time
import matplotlib.pyplot as plt
from fft import FFT
from koheron import connect
host = os.getenv('HOST', '192.168.1.16')
client = connect(host, 'fft', restart=False)
driver = FFT(client)
driver.set_fft_window(0)
driver.set_dds_freq(0, 0)
fig = plt.figure(figsize=(6,6))
ax = fig.add_subplot(111)
ax.set_xlim([0, 125])
ax.set_ylim([0, 40])
freqs = np.arange(driver.n_pts/2) * 250. / 8192
raw_input("Terminate ADC0 with 50 Ohm")
psd = driver.read_psd()
ax.plot(freqs, np.sqrt(50 * psd) * 1e9, label='ADC0 terminated with 50 Ohm')
raw_input("Connect DAC0 to ADC0")
psd = driver.read_psd()
ax.plot(freqs, np.sqrt(50 * psd) * 1e9, label='ADC0 connected to DAC0')
import numpy as np
import matplotlib
matplotlib.use('GTKAgg')
from matplotlib import pyplot as plt
from scipy import signal
import os, time
from koheron import connect
from fft import FFT
if __name__ == "__main__":
host = os.getenv('HOST', '192.168.1.16')
client = connect(host, 'fft')
driver = FFT(client)
driver.set_dds_freq(0, 50e6)
n = 4096
fs = 250e6
cic_rate = 500
ffft = np.fft.fftfreq(n) * fs / (cic_rate * 2)
# Dynamic plot
fig = plt.figure()
ax = fig.add_subplot(111)
x = np.arange(n)
y = np.zeros(n)
li, = ax.plot(np.fft.fftshift(ffft), y)
ax.set_ylim((-1000, 1000))
freqs = np.linspace(fmin, fmax, num=100)
freqs = np.round(freqs / fs * n_pts) * fs / n_pts
crosstalk = np.zeros((2, np.size(freqs)))
fig = plt.figure(figsize=(6, 6))
ax = fig.add_subplot(111)
ax.set_xlabel('Frequency (MHz)')
ax.set_ylabel('Crosstalk (dB)')
raw_input("Connect DAC0 to ADC0")
raw_input("Connect DAC1 to ADC1")
driver.set_dds_freq(1, 0)
for i, freq in enumerate(freqs):
n = np.uint32(freq / fs * n_pts)
driver.set_dds_freq(0, freq)
driver.set_input_channel(0)
time.sleep(0.5)
psd0 = driver.read_psd()
driver.set_input_channel(1)
time.sleep(0.5)
psd1 = driver.read_psd()
crosstalk[0, i] = 10 * np.log10(psd1[n - 1] / psd0[n - 1])