January 2016
Intermediate to advanced
278 pages
12h 27m
English
Content preview from Analog Circuits Cookbook
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Measurements (Audio and Video) 121
TIME BASE = 200uS
CH1 V/DIV = 2V
CH2 V/DIV = 2V
INPUT
-2V
OUTPUT
1-4V
Figure
4.24 As Figure 4.23, but with the input resistor raised to 50 MQ. The poor
performance is the fault of the designer, not the circuit
Raising the op-amp supply rails to ± 15v resulted in an output virtually as
good as in Figure 4.23. Clearly properly applied, bootstrapping can raise
the input impedance at dc and up to a frequency determined by the op-
amp's performance, to such a high level that a 100 MQ source resistance
results in no loss in amplitude, i.e. to an input impedance of 10 GQ or
more.
As a matter of interest, the circui ...
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