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APPLICATION INFORMATION

WIDEBAND VOLTAGE-FEEDBACK

1/4

OPA4830

V =+3V

OUT

53.6W

2.26kW

1.13kW

150W

6.8 F

0.1 F

750W

+1V

+V /3

1/4

OPA4830

V =+5V

OUT

53.6W

1.50kW

+V /2

1.50kW

150W

6.8 F

0.1 F

750W

2.5V

OPA4830

SBOS350A – DECEMBER 2006 – REVISED MAY 2008.................................................................................................................................................... www.ti.com

Figure 73 shows the ac-coupled, gain of +2V/V

configuration

used

for

the

+3V

Electrical

OPERATION

Characteristics and Typical Characteristics. For test

The OPA4830 is a unity-gain stable, very high-speed

purposes, the input impedance is set to 50

Ω with a

voltage-feedback op amp designed for single-supply

resistor to ground. Voltage swings reported in the

operation (+3V to +10V). The input stage supports

Electrical Characteristics are taken directly at the

input voltages below ground and to within 1.7V of the

input and output pins. For the circuit of Figure 73, the

positive supply. The complementary common-emitter

total effective load on the output at high frequencies

output stage provides an output swing to within 25mV

is 150

Ω || 1500Ω. The 1.13kΩ and 2.26kΩ resistors

of ground and the positive supply. The OPA4830 is

at the noninverting input provide the common-mode

compensated to provide stable operation with a wide

bias voltage. The parallel combination equals the dc

range of resistive loads.

resistance at the inverting input (RF), reducing the dc

output offset as a result of input bias current.

Figure 72 shows the ac-coupled, gain of +2V/V

configuration

used

for

the

+5V

Electrical

Characteristics and Typical Characteristics. For test

purposes, the input impedance is set to 50

Ω with a

resistor to ground. Voltage swings reported in the

Electrical Characteristics are taken directly at the

input and output pins. For the circuit of Figure 72, the

total effective load on the output at high frequencies

is 150

Ω || 1500Ω. The 1.5kΩ resistors at the

noninverting input provide the common-mode bias

voltage. This parallel combination equals the dc

resistance at the inverting input (RF), reducing the dc

output offset because of input bias current.

Figure 73. AC-Coupled, G = +2V/V, +3V

Single-Supply Specification and Test Circuit

Figure 72. AC-Coupled, G = +2V/V, +5V

Single-Supply Specification and Test Circuit

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