Category:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9
Position:IcFull.com » IC Electronic information » Category: G

IC Electronic information

Generate double filter sweep sine / cosine wave

In Electronic Infomation Category: G | on February 09,2012

demodulator, directed circuits and MJE210 datasheet and other electronic applications and MJE210 price and so often use two 90 phase difference of the sine wave, that is, a sine wave and MJE210 suppliers and its cosine waves. Engineers often have the analog filter phase shift. However, this method provides a limited frequency range. Use the circuit in Figure 1, you can 1 Hz ~ 25 kHz frequency range, to obtain a swept sine / cosine pair.

Figure 1, this circuit can 1Hz to 25kHz frequency range, resulting swept sine / cosine pair.

circuit with a Mixed Signal Integration Corporation MSFS5 selectable low pass / band-pass switched-capacitor filters, plus for the elimination of one of its input square wave harmonics. MSFS5 clock is 100 times the input square wave. 74HC390 and 74HC74 form a 25 and 2 frequency divider circuit. 74HC74 is connected to the Q output divided by 2 74HC390A two circuits, the resulting square wave frequency of the filter clock frequency of 1 / 100, the difference between each other as 90 . CMOS level square wave will filter saturation, so the circuit with a resistor R1 to R4 form a voltage divider to reduce the signal amplitude.

Figure 2 shows when the system clock of 2 MHz, the two filters in the 20 kHz output. Note that the phase of reading on the oscilloscope -89.85 . When the sweep, the phase change from -89 to -91 . Figure 3 shows a Lissajous type of 20 kHz.

Figure 2, the phase on the oscilloscope readings of -89.85 .

Figure 3, when the sweep, the phase at -89 ~ -91 between changes.

with a spectrum analyzer, and Audio Precision audio analyzers distortion of the circuit to do the test, get THD (total harmonic distortion) of -49 dB. Tests show that the circuit in the FSK (frequency shift keying) or FM (frequency modulation) mode, the filter output is not interrupted.

MJE210 datasheetMJE210 suppliersMJE210 Price

All right reserved:icfull.com © 2010-2016 Certificate