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参数资料
| 型号： | TSH350ILT |
| 厂商： | 意法半导体 |
| 英文描述： | 550 MHz, Low Noise Current Feedback Amplifier |
| 中文描述： | 550兆赫，低噪声电流反馈放大器 |
| 文件页数： | 11/21页 |
| 文件大小： | 383K |
| 代理商： | TSH350ILT |
Power Supply Considerations
TSH350
11/21
4 Power Supply Considerations
Correct power supply bypassing is very important for optimizing performance in high-frequency ranges.
Bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency
bypassing. A capacitor greater than 1
μ
F is necessary to minimize the distortion. For better quality
bypassing, a capacitor of 10nF can be added using the same implementation conditions. Bypass
capacitors must be incorporated for both the negative and the positive supply.
Note:
On the SO8_SINGLE_HF board, these capacitors are C6, C7, C8, C9.
Single power supply
In the event that a single supply system is used, new biasing is necessary to assume a positive output
dynamic range between 0V and +V
CC
supply rails. Considering the values of V
OH
and V
OL
, the amplifier
will provide an output dynamic from +0.9V to +4.1V on 100
load.
The amplifier must be biased with a mid-supply (nominally +V
CC
/2), in order to maintain the DC
component of the signal at this value. Several options are possible to provide this bias supply, such as a
virtual ground using an operational amplifier or a two-resistance divider (which is the cheapest solution).
A high resistance value is required to limit the current consumption. On the other hand, the current must
be high enough to bias the non-inverting input of the amplifier. If we consider this bias current (35
μ
A
max.) as the 1% of the current through the resistance divider to keep a stable mid-supply, two resistances
of 750
can be used.
The input provides a high pass filter with a break frequency below 10Hz which is necessary to remove the
original 0 volt DC component of the input signal, and to fix it at +V
CC
/2.
Figure 31
illustrates a 5V single power supply configuration for the SO8_S_MULTI evaluation board (see
Evaluation Boards
on page 10).
Figure 30: Circuit for power supply bypassing
+
-V
CC
+V
CC
10microF
+
10nF
+
10nF
-
10microF
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