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APPLICATION INFORMATION

Simplified Schematic

IN+

IN–

OUT

S0286-01

Independent Power Supplies

THS6022

SLOS225D – SEPTEMBER 1998 – REVISED JULY 2007

The THS6022 contains two independent operational amplifiers. These amplifiers are current feedback topology

amplifiers made for high-speed operation. They have been specifically designed to deliver the full power

requirements of ADSL and therefore can deliver output currents of at least 200 mA at full output voltage.

The THS6022 is fabricated using Texas Instruments 30-V complementary bipolar process, HVBiCOM. This

process provides excellent isolation and high slew rates that result in excellent crosstalk and extremely low

distortion.

Each amplifier of the THS6022 has its own power supply pins. This was specifically done to solve a problem that

often occurs when multiple devices in the same package share common power pins. This problem is crosstalk

between the individual devices caused by currents flowing in common connections. Whenever the current

required by one device flows through a common connection shared with another device, this current, in

conjunction with the impedance in the shared line, produces an unwanted voltage on the power supply. Proper

power-supply decoupling and good device power-supply rejection helps to reduce this unwanted signal. What is

left is crosstalk.

However, with independent power-supply pins for each device, the effects of crosstalk through common

impedance in the power supplies are more easily managed. This is because it is much easier to achieve low

common impedance on the PCB with copper etch than it is to achieve low impedance within the package with

either bond wires or metal traces on silicon.

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