Currently, there are two solutions for driving ADC. The first is to use a transformer, and the second is a differential amplifier.
A new differential amplifier
There are several advantages to differential amplifiers. The first is noise immunity, which was mentioned when introducing differential signals. The second advantage is the increased differential output voltage swing (see Figure 2). The reason is not complicated. The two voltages at the output are in anti-phase, and the difference is of course twice that of the single-ended output. The third advantage is
the reduction of even-order signal distortion. To explain this, we express the output voltage as a multi-order function of the input.
Figure 2 Differential output voltage swing
V
out
+ = k1V
in
+ k2V
in
2
+ k3V
in
3
+ … , (1)
V
out
- = k1(-V
in
) + k2(-V
in
)
2
+ k3(-V
in
)
3
+… (2)
V
od
= V
out
-V
out
-=2k1V
in
+ 2k3V
in
3
+ … (3)
It can be seen from equation (3) that the even orders are eliminated.
In order to adapt to the development of the market, various companies have launched their own differential amplifier products, such as ADI's AD4937/4938, TI's THS4520, MAXIM's MAX4198/MAX4199 and Linear's LTC6400. With the advancement of technology, the technical parameters of these products have reached a very high level. Take AD4937 as an example, its input voltage noise is 2.2nV/√Hz; 1.6GHz -3dB bandwidth, gain G=1; slew rate is 5000V/μS; 0.1dB gain flatness bandwidth at 125MHz; can drive ADC from DC to 100MHz.
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