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參數(shù)資料
| 型號： | 051AC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS |
| 中文描述： | 增強型場效應低失調運算放大器 |
| 文件頁數(shù)： | 36/68頁 |
| 文件大小： | 1336K |
| 代理商： | 051AC |
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TL05x, TL05xA
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178A – FEBRUARY 1997 - REVISED FEBRUARY 2003
41
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
phase meter
The phase meter in Figure 84 produces an output voltage of 10 mV per degree of phase delay between the two
input signals VA and VB. The reference signal VA must be the same frequency as VB. The TLC3702 comparators
(U1) convert these two input sine waves into
±5-V square waves. Then, R1 and R4 provide level shifting prior
to the SN74HC109 dual J-K flip flops.
Flip-flop U2B is connected as a toggle flip-flop and generates a square wave at one-half the frequency of VB.
Flip-flop U2A also produces a square wave at one-half the input frequency. The pulse duration of U2A varies
from zero to one-half the period, where zero corresponds to zero phase delay between VA and VB and one-half
the period corresponds to VB lagging VA by 360 degrees.
The output pulse from U2A causes the TLC4066 (U3) switch to charge the TL05x (U4) integrator capacitors C1
and C2. As the phase delay approaches 360 degrees, the output of U4A approximates a square wave, and U2A
has an output of almost 2.5 V. U4B acts as a noninverting amplifier with a gain of 1.44 in order to scale the
0- to 2.5-V integrator output to a 0- to 3.6-V output range.
R8 and R10 provide output gain and zero-level calibration. This circuit operates over a 100-Hz to 10-kHz
frequency range.
+
–
+
–
+5 V
R2
100 k
R1
100 k
U1A
VA
S
1J
C1
U2A
1K
R
NC
U2B
2K
R3
VB
U1B
R6
10 k
R7
10 k
+5 V
S
2J
C1
R
NC
100 k
R4
100 k
U3
R5
C1
10 k
0.016
F
C2
0.016
F
U4A
U4B
VO
R9
20 k
R8
Gain
50 k
+5 V
R10
10 k
Zero
–5 V
NOTE A: U1 = TLC3702; VCC
± = ±5 V
U2 = SN74HC109
U3 = TLC4066
U4, U5 = TL05x; VCC
± = ±5 V
Figure 84. Phase Meter
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