Features

(2nd/3rd: -59/-62dBc @ 20MHz and 10dBm)

and compensation

Applications

General Description

The KH561 is a wideband DC coupled, amplifier that

combines high output drive and low distortion. At

bandwidth is 150MHz. 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 KH561 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 KH561 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 compensation allows

user adjustment of the frequency response. The

KH561 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 KH561 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

KH560, offers superior pulse fidelity for high accuracy

DC coupled applications.

The KH561 is constructed using thin film resistor/bipolar

transistor technology, and is available in the following

versions:

KH561AI

-25°C to +85°C

24-pin Ceramic DIP

KH561AK

-55°C to +125°C

24-pin Ceramic DIP,

features burn-in

and hermetic testing

KH561AM

-55°C to +125°C

24-pin Ceramic DIP,

environmentally screened

and electronically tested

to MIL-STD-883

KH561

Wideband, Low Distortion Driver Amplifier

REV. 1A January 2004

4

19

23

21

20

15

10

5

18

8

+

-

Compensation

All undesignated

pins are internally

unconnected. May

be grounded if

desired.

V+

V-

K

Frequency Response vs. Output Power

Frequency (MHz)

5

16

12

6

0

40

80

120

160

200

10

8

14

Typical Distortion Performance

Output

20MHz

50MHz

100MHz

Power

2nd

3rd

2nd

3rd

2nd

3rd

10dBm

-59

-62

-52

-60

-35

-49

18dBm

-52

-48

-45

-46

-30

-36

24dBm

-50

-41

-36

-32

-40

-30

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