source:Industry News Popular:adapter release time:2021-07-05 10:00:44 Article author:sznbone
Power adapter noise reduction problem
1. Is it necessary to use a high-precision operational amplifier?
The input signal level amplitude may exceed the error tolerance of the operational amplifier, which is not acceptable for the operational amplifier. If the input signal or common-mode voltage is too weak, designers should use a high-precision operational amplifier with extremely low compensation voltage (Vos) and extremely high common-mode rejection ratio (CMRR). Whether to use a high-precision operational amplifier depends on how many times the system design needs to achieve the amplification gain. The greater the gain, the more accurate operational amplifiers are needed.
2. What kind of power supply voltage does the operational amplifier need?
This problem depends on the dynamic voltage range of the input signal, the overall power supply voltage of the system, and the output requirements. However, the different power adapter rejection ratio (PSRR) of different power adapters will affect the accuracy of the operational amplifier. Among them, battery-powered The system is most affected. In addition, the power consumption is also directly related to the quiescent current of the internal circuit and the supply voltage.
3. Does the output voltage need a full swing?
Low power supply voltage designs usually require full swing output in order to make full use of the entire dynamic voltage range to expand the output signal swing. As for the problem of rail-to-rail input, the configuration of the operational amplifier circuit will have its own solution. Since the preamplifier generally adopts inverting or non-inverting amplifier configuration, the input does not need to be full swing. The reason is that the common mode voltage (Vcm) is always less than the output range or equal to zero (with very few exceptions, such as a single unit with floating ground). Supply voltage operational amplifier).
4. Is the issue of gain bandwidth more worrying?
Yes, especially for audio preamplifiers, this is a very worrying issue. Since human hearing can only perceive sounds in the frequency range from about 20Hz to 20kHz, some engineers ignore or despise this "narrow range" bandwidth when designing audio systems. In fact, important technical parameters that reflect the performance of audio devices, such as low total harmonic distortion (THD), fast slewrate, and low noise, are all necessary conditions for high gain bandwidth amplifiers.
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