KH600

DATA SHEET

REV. 2 January 2004

9

Single-to-Differential Operation

The KH600 is specifically designed for differential-to-

differential operation. However, the KH600 can be used in a

single-to-differential configuration with some performance

degradation. The unused input should be terminated into 50

Ω.

When driven single-ended, there will be a slight imbalance in

the differential output voltages, see Figure 5. This imbalance

is approximately 2.88dB. To compensate for this imbalance,

attenuate the higher gain output. (If the signal is applied to

IN1, attenuate OUT1.)

Unused Inputs and/or Outputs

For optimal performance, terminate any unused inputs and/or

outputs with 50

Ω.

Adjusting Supply Current

The KH600 operates class A, so maximum output current is

directly proportional to supply current. Adjusting the voltages

current. The default supply current of the KH600 has been

optimized for best bandwidth and distortion performance. The

main reason for adjusting supply current is to either reduce

power or increase maximum output current. Adjusting the

supply current will not significantly improve bandwidth or

distortion and may actually degrade them.

To adjust the supply current, apply voltages of equal magnitude,

but opposite polarity, to the bias voltage pins. For example,

in Figure 3) results in the standard supply current condition.

approximate 10% increase in supply current. Figure 10 shows

the how the total supply current of the KH600 is effected by

Supply current is relatively independent of the voltages on

160

140

120

100

80

0

02

6

8

4

60

40

20

±V

pply Current vs.

±

100

70

60

50

40

0

Supply Voltage (

±V)

02

6

8

4

30

20

10

90

80

±V

1100

900

800

500

Total Supply Current (mA)

40

60

100

140

80

700

600

1000

120

-40

-50

-60

-70

-80

-90

-100

Total Supply Current (mA)

40

60

100

140

80

120

3rd

2nd