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APPLICATION INFORMATION
Simplified Schematic
IN+
IN–
V
CC+
V
CC–
OUT
I
bias
S0286-01
I
bias
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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