HS-1135RH(1999) データシートの表示（PDF） - Intersil

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HS-1135RH
(Rev.:1999)

Radiation Hardened, High Speed, Low Power Current Feedback Amplifier with Programmable Output Limiting

Intersil 

HS-1135RH

subnanosecond recovery time. The difference between the

unclamped and clamped propagation delays is the overdrive

recovery time. The appropriate propagation delays are 4.0ns

for the unclamped pulse, and 4.8ns for the clamped (2X

overdrive) pulse yielding an overdrive recovery time of

800ps. The measurement uses the 90% point of the output

transition to ensure that linear operation has resumed. Note:

The propagation delay illustrated is dominated by the

fixturing. The delta shown is accurate, but the true

HS-1135RH propagation delay is 500ps.

Use of Die in Hybrid Applications

This amplifier is designed with compensation to negate the

package parasitics that typically lead to instabilities. As a

result, the use of die in hybrid applications results in

overcompensated performance due to lower parasitic

capacitances. Reducing RF below the recommended values

for packaged units will solve the problem. For AV = +2 the

recommended starting point is 300Ω, while unity gain

applications should try 400Ω.

PC Board Layout

The frequency performance of this amplifier depends a great

deal on the amount of care taken in designing the PC board.

The use of low inductance components such as chip

resistors and chip capacitors is strongly recommended,

while a solid ground plane is a must!

Attention should be given to decoupling the power supplies.

A large value (10µF) tantalum in parallel with a small value

chip (0.1µF) capacitor works well in most cases.

Terminated microstrip signal lines are recommended at the

input and output of the device. Output capacitance, such as

that resulting from an improperly terminated transmission

line will degrade the frequency response of the amplifier and

may cause oscillations. In most cases, the oscillation can be

avoided by placing a resistor in series with the output.

Care must also be taken to minimize the capacitance to

ground seen by the amplifier’s inverting input. The larger this

capacitance, the worse the gain peaking, resulting in pulse

overshoot and possible instability. To this end, it is

recommended that the ground plane be removed under

traces connected to pin 2, and connections to pin 2 should

be kept as short as possible.

An example of a good high frequency layout is the

Evaluation Board shown in Figure 2.

Evaluation Board

An evaluation board is available for the HS-1135RH,

(HFA11XXEVAL). Please contact your local sales office for

information.

The layout and schematic of the board are shown here:

VH

1

+IN

OUT V+

VL V-

GND

FIGURE 2A. TOP LAYOUT

FIGURE 2B. BOTTOM LAYOUT

500Ω

50Ω

IN

10µF 0.1µF

500Ω

1

2

3

4

-5V

VH

8

7

6

5

GND

0.1µF

50Ω

10µF

+5V

OUT

VL

GND

FIGURE 2C. SCHEMATIC

FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT

3

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