THS7001, THS7002

70-MHz PROGRAMMABLE-GAIN AMPLIFIERS

SLOS214B – OCTOBER 1998 – REVISED AUGUST 1999

24

POST OFFICE BOX 655303

APPLICATION INFORMATION

driving a capacitive load (continued)

+

_

PREAMP

CLOAD

499

Ω

Input

Output

499

Ω

20

Ω

Figure 61. Driving a Capacitive Load

offset voltage

the corresponding gains. The following schematic and formula can be used to calculate the output offset

voltage:

V

OO +

V

IO

1

)

R

F

R

G

" I

IB

)

R

S

1

)

R

F

R

G

" I

IB–

R

F

+

–

VI

+

RG

RS

RF

IIB–

VO

IIB+

Figure 62. Output Offset Voltage Model

general configurations

When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often

required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the THS7001

and THS7002 preamplifier (see Figure 63).

VI

VO

C1

+

–

RG

RF

R1

f

–3dB +

1

2

pR1C1

V

O

V

I

+ 1 )

R

F

R

G

1

1

) sR1C1

Figure 63. Single-Pole Low-Pass Filter