KH600

DATA SHEET

REV. 2 January 2004

7

Application Information

General Description

Standard Operation:

The KH600 is a 1GHz differential input/output amplifier

constructed using Cadeka’s in-house thin film resistor/bipolar

transistor technology. A differential signal on the inputs of the

KH600 will generate a differential signal at the outputs. If a

single ended input signal is applied to IN1 and a fixed voltage

to IN2, the KH600 will produce both a differential and common-

mode output signal. To achieve the maximum dynamic range,

The KH600 includes 50

Ω resistors from each input to ground,

resulting in a differential input impedance of 100

Ω. Each

KH600 output has a 50

Ω resistance, synthesized by feedback,

providing a 100

Ω differential output impedance.

The KH600 has 3 bias voltage pins that can be used to:

• Adjust the supply current

• Trim the differential output offset voltage

• Adjust the common mode output offset voltage

over a ±3V range

Condition. All of the plots in the Typical Performance section

and the specifications in the Electrical Characteristics table

utilize the basic circuit configuration shown in Figure 2,

unless otherwise indicated. Figure 3 illustrates the optional

circuit configuration, utilizing the bias voltage pins. Further

discussions regarding these optional adjustments are provided

later in this document.

Figure 2: Basic Circuit Configuration

Figure 3: Optional Circuit Configuration (including

optional supply current and offset adjust)

Gain

Differential Gain for the KH600 is defined as (OUT1– OUT2)/

(IN1–IN2). Applying identical (same phase) signals to both

inputs and measuring one output will provide the Common

Mode Gain. Figure 4 shows the differential and common

mode gains of the KH600. Figure 5 illustrates the response

of the KH600 outputs when one input is driven and the other

is terminated into 50

Ω.

Figure 4: Differential and Common Mode Gain

C6

0.01

µF

C8

0.01

µF

C4

0.01

µF

C1

0.01

µF

-OUT

-IN

+OUT

+IN

U1

KH600

1

2

3

9

8

7

GND

C10

6.8

µF

C9

6.8

µF

C5

0.01

µF

C6

6.8

µF

C8

0.01

µF

C13

0.01

µF

C1

0.01

µF

-OUT

-IN

+OUT

+IN

U1

KH600

1

2

3

9

8

7

GND

GND

C10

6.8

µF

C9

6.8

µF

C14

6.8

µF

+

C4

0.01

µF

+

C15

0.01

µF

30pF

C16

6.8

µF

+

30pF

20

5

0

-10

Frequency (Hz)

1M

100M

1G

10M

-5

10

Differential Gain

Common Mode Gain

15