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APPLICATION INFORMATION

RESISTOR MATCHING

V

DD

) VSS

2

(1)

_

+

x1

Output Buffer

Vcm Error

Amplifier

C

R

C

R

x1

Output Buffer

30 k

Ω

30 k

Ω

THS4120

THS4121

SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004

Resistor matching is important in fully differential amplifiers. The balance of the output on the reference voltage

depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion

diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to

keep the performance optimized.

internally defined as:

operation range of the amplifier. For the prevention of noise going through the device, use a 0.1-

µF capacitor on

Figure 18. THS412x Simplified Diagram

10

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