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參數(shù)資料
| 型號： | AND8054 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Designing RC Oscillator Circuits with Low Voltage Operational Amplifiers and Comparators for Precision Sensor Applications |
| 中文描述： | RC振蕩器電路設(shè)計低電壓運算放大器和精密傳感器應(yīng)用比較 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大小： | 168K |
| 代理商： | AND8054 |
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AND8054/D
http://onsemi.com
6
Ratio State Variable Oscillator
The ratio state variable oscillator [6] is used for dual
capacitive sensors when the oscillation frequency is
proportional to the ratio of sensor capacitances C
3
and C
4
(i.e.
freq.
α
C
3
/ C
4
). The block diagram and schematic of the ratio
circuit are shown in Figures 7 and 8. This circuit consists of
two integrators and a differentiator circuit. The integrators
formed by amplifier A
1
and A
2
are identical to the integrators
used in the absolute circuit. Amplifier A
3
, resistors R
3
, R
4
and
R
5
, and the sensor capacitors C
3
and C
4
form the
differentiator stage which provides a 180 phase shift. The
values of resistors R
3
, R
4
and R
5
are selected to set the break
frequencies of the differentiator stage, so that the gain of the
stage is equal to –C
3
/C
4
. Resistor R
5
provides a DC current
path through capacitor C
3
in order to initiate oscillation at
power–up. Because R
5
is relatively large (M
), it can be
replaced with a three resistor “Tee” network in order to use
readily available resistors, as shown in Figure 9.
Limit Circuit
Integrator
Differentiator
Integrator
Figure 7. Ratio Oscillator Block Diagram
V
1
V
2
V
3
θ
= 90
°
θ
= 90
°
Limit Circuit
Figure 8. Ratio Oscillator Schematic
The differentiator amplifier is formed by the dual sensor capacitances C3 and C4.
C1
C2
C4
R2
R3
R4
A3
A2
A1
R1
V
1
V
2
V
3
R5
C3
C1
C2
C4
R2
R3
R4
A3
A2
A1
R1
V
1
V
2
V
3
R5a
R5b
C3
R5c
R5a
R5b
R5c
Figure 9. Ratio Oscillator Schematic with R5 Tee Network
A Tee network provides a method to replace a large resistor (i.e. M
) with three small resistors (i.e. k
).
R5_equivalent
R5a
R5b
R5aR5b
R5c
+
–
+
–
+
–
+
–
+
–
+
–
θ
= 180
°
R5_equivalent
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