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부품번호 | KH560 기능 |
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기능 | Wideband/ Low Distortion Driver Amplifier | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 13 페이지수
KH560
Wideband, Low Distortion Driver Amplifier
www.fairchildsemi.com
Features
s 120MHz bandwidth at +24dBm output
s Low distortion
(2nd/3rd: -60/-62dBc @ 20MHz and 10dBm)
s Output short circuit protection
s User-definable output impedance, gain,
and compensation
s Internal current limiting
s Direct replacement for CLC560
Applications
s Output amplification
s Arbitrary waveform generation
s ATE systems
s Cable/line driving
s Function generators
s SAW drivers
s Flash A/D driving and testing
Large Signal Pulse Response
Av = +20
Av = -20
Time (5ns/div)
V+ 8
+
V- 18
5
10
15
20
-
4 +VCC
19 Compensation
23 Vo
21 -VCC
All undesignated
pins are internally
unconnected. May
be grounded if
desired.
Typical Distortion Performance
Output
Power
10dBm
18dBm
24dBm
20MHz
2nd 3rd
-60 -62
-51 -48
-46 -38
50MHz
2nd 3rd
-50 -54
-40 -40
-33 -25
100MHz
2nd 3rd
-54 -44
-36 -29
General Description
The KH560 is a wideband DC coupled, amplifier that
combines high output drive and low distortion. At
an output of +24dBm (10Vpp into 50Ω), the -3dB
bandwidth is 120MHz. As illustrated in the table
below, distortion performance remains excellent
even when amplifying high-frequency signals to high
output power levels.
With the output current internally limited to 250mA,
the KH560 is fully protected against shorts to ground
and can, with the addition of a series limiting resistor
at the output, withstand shorts to the ±15V supplies.
The KH560 has been designed for maximum flexibility
in a wide variety of demanding applications. The
two resistors comprising the feedback network set
both the gain and the output impedance, without
requiring the series backmatch resistor needed by
most op amps. This allows driving into a matched
load without dropping half the voltage swing
through a series matching resistor. External compen-
sation allows user adjustment of the frequency
response. The KH560 is specified for both maximally
flat frequency response and 0% pulse overshoot
compensations.
The combination of wide bandwidth, high output
power, and low distortion, coupled with gain, output
impedance and frequency response flexibility, makes
the KH560 ideal for waveform generator applications.
Excellent stability driving capacitive loads yields
superior performance driving ADC’s, long transmission
lines, and SAW devices. A companion part, the
KH561, offers higher full power bandwidth for
broadband sinusoidal applications.
The KH560 is constructed using thin film resistor/bipolar
transistor technology, and is available in the following
versions:
KH560AI
KH560AK
KH560AM
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
24-pin Ceramic DIP
24-pin Ceramic DIP,
features burn-in
and hermetic testing
24-pin Ceramic DIP,
environmentally screened
and electronically tested
to MIL-STD-883
REV. 1A February 2001
DATA SHEET
KH560
KH560 Typical Performance Characteristics (TA = +25°C, Circuit in Figure 1; unless specified)
Small Signal Gain and Phase
16
Po = 10dBm
14
12
10
8
6
0
0% Overshoot
Maximally Flat
Phase
Gain
0
-90
-180
-270
-360
50 100 150 200
Frequency (MHz)
250
Frequency Response vs. RL
RL = 50Ω
Pi = -4dBm
RL = 75Ω
RL = 25Ω
Fixed gain and
compensated vs. load
RL = 100Ω
0 50 100 150 200 250
Frequency (MHz)
Frequency Response vs. Gain (Ro, RL = 75Ω)
Vo = 2Vpp
Av = 10
Av = 15
Av = 20
Av = 5
Frequency Response vs. Gain
Av = 10
Po = 10dBm
Av = 5
Av = 15
Re-compensated at
each gain (see text)
Av = 20
0 50 100 150 200 250
Frequency (MHz)
Frequency Response vs. Power Supply
16
Po = 10dBm
14
±VCC = 18
12
±VCC = 15
10
±VCC = 12
8
Re-compensated at
each supply voltage
6
±VCC = 10
0 50 100 150 200
Frequency (MHz)
250
Gain Flatness/Deviation from Linear Phase
Po = 10dBm
Gain
Phase
Re-compensated
at each gain
0 50 100 150 200 250
Frequency (MHz)
Two Tone, 3rd-Order Intermodulation
45
Av = 5
40
Av = 10
35
30 Av = 15
Av = 20
25
Re-compensated
at each gain
20
0 20 40 60
Frequency (MHz)
80
100
Frequency Response Driving CL
Av = +5
Ro = 25
Vo = 2Vpp
CL = 20pF
CL = 100pF
CL = 50pF
Re-compensated
at each CL
0 50 100 150 200
Frequency (MHz)
250
0 20 40 60 80 100
Frequency (MHz)
2nd Harmonic Distortion vs. Frequency
-25
100MHz
-35
-45
50MHz
20MHz
-55
10MHz
-65
-75
4
8 12 16 20
Output Power (dB)
24
2nd Harmonic Distortion Driving CL
-30
Compensation as shown in
Frequency Response plot
Av = +5
Ro = 25
-40 Vo = 2Vpp
-50 CL = 20pF
-60
CL = 50pF
-70
CL = 100pF
-80
10
20 30 40 50 70
Frequency (MHz)
100
Frequency Response vs. Output Power
16
Po = 18dBm
Vo = 5Vpp
14 Po = 10dBm
Vo = 2Vpp
12
10 Po = 27.5dBm
Vo = 15Vpp
8
Po = 24dBm
Vo = 10Vpp
6
0 40 80 120 160 200
Frequency (MHz)
Frequency Response vs. Ro
Pi = -4dBm
Ro = 25Ω
Ro = 50Ω
Ro = 75Ω
Ro = 100Ω
Response measured with matched load
Re-compensated at each Ro
0 50 100 150 200
Frequency (MHz)
Internal Current Gain and Phase
250
Gain
30
20
10 Phase
0
-10
-20
-30
Phase consistant with current
polarity connection of Figure 3
Cx = 0
RL = 0
180
90
0
-90
-180
0 100 200 300 400 500
Frequency (MHz)
3rd Harmonic Distortion vs. Frequency
-25
100MHz
-35 50MHz
-45 20MHz
-55
10MHz
-65
-75
4
8 12 16 20
Output Power (dB)
3rd Harmonic Distortion Driving CL
-30
Av = +5
Ro = 25
-40 Vo = 2Vpp
24
CL = 20pF
-50
-60
CL = 100pF
CL = 50pF
-70
-80
10
20 30 40 50 70
Frequency (MHz)
100
4 REV. 1A February 2001
4페이지 KH560
DATA SHEET
part, relatively constant performance over supply voltage
is achieved. A current sense in the error current leg of
the 10X current mirror feeds back to the bias current
setup providing a current shutdown feature when the
output current approaches 250mA.
+VCC
4
Ibias Current Limit 10X Current Mirror
Q1
Vi 8
-VCC
+VCC
Q2
Q3
ierr
5pF
19
Cx
Rg Rf
Q4
5pF
Io
23 Ro Vo
Io
Ibias 10X Current Mirror
Current Limit
21
-VCC
Figure 2: Simplified Circuit Diagram
Developing the Performance Equations
The KH560 is intended to provide both a controllable
voltage gain from input to output as well as a controllable
output impedance. It is best to treat these two operations
separately with no load in place. Then, with the no-load
gain and output impedance determined, the gain to the
load will simply be the no-load gain attenuated by the
voltage divider formed by the load and the equivalent
output impedance.
Figure 3 steps through the output impedance develop-
ment using an equivalent model of Figure 2. Offering an
equivalent, non-zero, output impedance into a matched
load allows the KH560 to operate at lower internal volt-
age swings for a given desired swing at the load. This
allows higher voltage swings to be delivered at the load
for a given power supply voltage at lower distortion levels
than an equivalent op amp needing to generate twice the
voltage swing actually desired at the matched load. This
improved distortion is specified and tested over a wide
range as shown in the specification listing.
Get both Vo and Io into terms of just the error current, ierr,
using:
V− = ierr Ri and
if
= ierr
+ V−
Rg
= ierr
1+
Ri
Rg
Vo
=
V− + if Rf
= ierr
Ri
+ Rf
1+
Ri
Rg
Vo
=
ierr
Rf
+ Ri
1+
Rf
Rg
and
Io
=
Gierr
+ if
=
ierr
G + 1+
Ri
Rg
then
Ro
≡
Vo
Io
=
Rf
+
Ri
1+
Rf
Rg
G + 1+ Ri
Rg
note that Ro
= Rf
G+1
Ri = 0
Figure 3: Output Impedance Derivation
Note that the Ro expression simplifies considerably if
Ri = 0. Also note that if the forward current gain were to
go to infinity, the output impedance would go to 0. This
would be the normal op amp topology with a very high
internal gain. The KH560 achieves a non-zero Ro by
setting the internal forward gain to be a low, well
controlled, value.
Developing the No-Load Gain Expression
Taking the output impedance expression as one con-
straint setting the external resistor values, we now need
to develop the no-load voltage gain expression from the
non-inverting input to the output as the other constraint.
Figure 4 shows the derivation of the no load gain.
+
-
ierr V-
Rg
X1
Ri
Gierr
if
Rf
REV. 1A February 2001
Ro Vo
lo
+
Vi
-
ierr V-
Rg
X1
Ri
Rf
Gierr
Vo
No load gain
Av
≡
Vo
Vi
7
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부품번호 | 상세설명 및 기능 | 제조사 |
KH560 | Wideband/ Low Distortion Driver Amplifier | Fairchild Semiconductor |
KH560 | Low Distortion Driver Amplifier | Cadeka |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |