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LT1126/LT1127

11267fa

–

OUTPUT

1126-7 AI01

CIN

FREQUENCY (Hz)

0.01

0.1

1.0

0.1

100

1126-7 TA03

0.001

GAIN ERROR =

CLOSED LOOP GAIN

OPEN LOOP GAIN

TYPICAL

PRECISION

OP AMP

LT1126/LT1127

–

OUTPUT

1126-7 TA02

365

Ω

INPUT

15k

340k

20k

TRIM

+15V

–15V

RN60C FILM RESISTORS

THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1126/LT1127 IS USEFUL IN LOW FREQUENCY HIGH CLOSED

LOOP GAIN AMPLIFIER APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN LOOP GAIN OF ONE

MILLION WITH 500kHz BANDWIDTH. AS THE GAIN ERROR PLOT SHOWS, THIS DEVICE IS CAPABLE OF 0.1%

AMPLIFYING ACCURACY UP TO 0.3Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY AT A FASTER

RATE. THE LT1126/LT1127 “GAIN PRECISION — BANDWIDTH PRODUCT” IS 330 TIMES HIGHER, AS SHOWN.

LT1126

High Speed Operation

When the feedback around the op amp is resistive (RF), a

pole will be created with RF, the source resistance and

capacitance (RS, CS), and the amplifier input capacitance

(CIN ≈ 2pF). In low closed loop gain configurations and

Gain Error vs Frequency

Closed Loop Gain = 1000

APPLICATI

TYPICAL

Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz

with RS and RF in the kilohm range, this pole can create

excess phase shift and even oscillation. A small capacitor

(CF) in parallel with RF eliminates this problem. With

RS (CS + CIN) = RF CF, the effect of the feedback pole is

completely removed.

APPLICATIO S I FOR ATIO

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