kh103 Fairchild Semiconductor, kh103 Datasheet - Page 5

• Manufacturer Part Number: kh103
• Description: Fast Settling, High Current Wideband Op Amp
• Manufacturer: Fairchild Semiconductor

KH103
with a 70kHz square wave large enough to produce a
transition from +5V to -5V at the KH103 output and
adjusting R
should be about 9.5R
adjusted around the value of 0.5R
Bias Control
In normal operation, the bias control pin (pin 16) is left
unconnected. However, if control over the bias of the
amplifier is desired, the bias control pin may be driven
with a TTL signal; a TTL high level will turn the amplifier
off.
REV. 1A February 2001
Figure 4: Inverting Gain Composite Amplifier to be
Figure 3: Non-Inverting Gain Composite Amplifier
to be Used with Figure 1 Circuit
b
until the output of U1 is at a minimum. R
Used with Figure 2 Circuit
g
for bad results; thus, R
g
.
b
should be
a
Distortion and Noise
The graphs of intercept point versus frequency on the
page 3 make it easy to predict the distortion at any fre-
quency, given the output voltage of the KH103. First con-
vert the output voltage V
P = (10log
At the frequency of interest, its 2nd harmonic will be S
(I
S
third order intermodulation products. These approxima-
tions are useful for P < -1dB compression levels.
Approximate noise figure can determined for the KH103
using the Equivalent Input Noise graph on page 3. The
following equation can be used to determine noise figure
(F) in dB.
where v
current. Beyond the breakpoint of the curves (i.e. where
they are flat) broadband noise figure equals spot noise,
so ∆f should equal one (1) and v
directly off the graph. Below the breakpoint, the noise
must be integrated and ∆f set to the appropriate band-
width.
2
3
- P) dB below the level of P. Its third harmonic will be
= 2(I
3
n
- P) dB below the level of P, as will the two-tone
is the rms noise voltage and i
10
(20V
rms
2
)) to get the output power in dBm.
o
to V
rms
n
= (V
and i
pp
n
/2√2) and then to
n
is the rms noise
should be read
DATA SHEET
2
=
5