參數(shù)資料
型號(hào)： 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(jì)低電壓運(yùn)算放大器和精密傳感器應(yīng)用比較
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 168K
代理商： AND8054
AND8054/D
http://onsemi.com
18
Dual Power Supply Limit Circuits
Figure 18 shows the clamping function of the limit circuit
for a dual power supply application. A simple dual supply
voltage limit circuit can be created by using two
back–to–back zeners as shown in Figure 19. There are
several performance limitations with this circuit that result
from the relative large junction capacitance, leakage current
and temperature coefficient of a zener diode. These
limitations result in a distortion of the output signal and an
error in the oscillation frequency. In addition, this circuit’s
low voltage operation is limited to the value of the zener
diode’s clamping voltage (V
Zener
) plus the forward voltage
drop (V
f
) of the second zener diode. Zener diodes are
available in voltages of about 1.8 volts, while their forward
voltage drop is typically 0.7; therefore, this circuit is not
useful for voltage limiting applications below 2.5 volts.
The minimum voltage range of the back–to–back zener
diode limit circuit can be reduced by adding two resistors to
the limit circuit as shown in Figure 20 [4]. The clamping
value of this circuit is a function of the zener diode
breakdown voltage multiplied by the ratio of the resistors.
This circuit is solves the low voltage limitation of the
back–to–back zener limit circuit; however, this circuit is not
suitable for the integrator amplifiers of the oscillator when
resistor R2 is replaced by a capacitor.
V
IN
V
OUT
V
Neg_Limit
V
Pos_Limit
V
IN
and V
OUT
Figure 18. Dual Power Supply Clamping
V
EE
Figure 19. Back–to–Back Zener Diode Limit Circuit
D1
V
CC
V
IN
V
OUT
R1
R2
D2
+
–
VLimit
(VZener
Vf)
V
EE
Figure 20. Back–to–Back Zener Diode Limit Circuit
with Voltage Ratio Resistors
D1
V
CC
V
IN
V
OUT
R1a
R2
D2
R1b
+
–
VLimit
(VZener
Vf)*
R2
R1b
R2
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