70009 Parallax Inc, 70009 Datasheet - Page 120
70009
Manufacturer Part Number
70009
Description
BOOK UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Type
Signal Analysisr
Datasheet
1.70009.pdf
(137 pages)
Specifications of 70009
Style
Book
Title
Understanding Signals
Contents
Guide to Generate, View and Measure Wave Forms
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
Other names
70009PAR
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How healthy is your battery? We measured the clipped signals for 3 different 9 V
batteries, and had readings of 8.01 V, 7.29 V and a low of 6.53 V, shown in Figure 8-13.
ACTIVITY #2: INVERTING AMPLIFIER WITH ADJUSTABLE DC OFFSET
The op-amp circuit in this Activity performs two functions at once. The first function is
that of an inverting amplifier; the second supplies a DC offset to the output signal.
Recalling the formula Chapter 4, using a 10 kΩ resistor as Ri and a 20 kΩ resistor as Rf
will cause a gain of 2. Recall also that an in the case of an inverting amplifier, the
voltage output will be negative 2 times the voltage input. Therefore, an input signal that
swings from 1 to 3 V put through an inverting amplifier with a gain of 2 would output a
signal that swings from -2 to -6 V. Further, recall that an op-amp cannot output a signal
with a voltage that exceeds the voltages applied to the supply rails (Vcc and Vee). Notice
that in the schematic (Figure 8-14) that Vee is connected to 0 V. Since the whole range
of the output signal is below 0 V, the entire signal would be clipped, and would only be
visible on the OPTAscope as a 20 mV flat line!
Figure 8-13:
Output signal
with a gain of
3, heavily
clipped
Note that the
MAX voltage
measurement
shows 6.53 V,
evidence of a
weakening 9 V
battery.