APPLICATION INFORMATION

RESISTOR MATCHING

V

CC) )

V

CC–

2

_

+

x1

Output Buffer

Vcm Error

Amplifier

C

R

C

R

x1

Output Buffer

30 k

Ω

30 k

Ω

THS4150

THS4151

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

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

keep the performance optimized.

voltage internally defined as:

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

µF capacitor on the V

OCM

pin as a bypass capacitor. Figure 30 shows the simplified diagram of the THS415x.

Figure 30. THS415x Simplified Diagram

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