前置

This article presents the Characteristics and design thoughts of the Pre-amplifier of PH Meter,the application of the relevant techniques of EMC and the measures that used in the design.

介绍了PH计前置放大器的特点及其设计思想，阐述了电磁兼容相关技术的应用以及设计中所采取的措施。

An analysis of noise models for two basic pre-amplifier structures:voltage and transimpedance are carried out.

如何降低电路噪声是读出电路研究热点之一，本文就红外探测器的电压型和跨导型两种基本结构前置放大器，建立了噪声等价模型，分析比较了其信噪比。

The purpose of this thesis is to put forward a novel 155MHz pre-amplifier for FTTH. The full flow has been completed, including circuit design, layout and parasitic parameter extracting.

本文提出了一种适用于FTTH155M接收机的前置放大器的设计并完成其版图级的设计和反标验证。

Principle of ECG-based diagnostic techniques and their understanding of the design by the pre-amplifier, filter and single-chip embedded components of the AD converter input channel.

基于对心电图原理及其诊断技术的理解，设计了由前置放大器、滤波器和单片机内嵌的AD转换器组成的输入通道。

The distortion of the spectral density function caused by using class C amplifieation in pre-amplifier are analysed.

此外，本文还就在前置放大器中使用丙类放大器对谱分析结果所造成的失真作了分析。

If you only have an old turntable and no amplifier, you will need to amplify the signal using a pre-amplifier before plugging it into the PC sound card.

如果你只有一个老唱盘，没有放大器，你需要使用前置放大器将信号放大，然后再将其与电脑声卡连接。

Positive signal input to channel 1 differential input pre-amplifier.

第一道差分输入前置放大器的正信号输入

By the pre-amplifier, the use of low-pass and high pass filter in series, the effective frequency of ECG interference from outside the filter.

经前置放大器后，运用低通和高通滤波器的串联，对心电信号有效频率外的干扰进行滤波。

Then we emphasisly explained the design and development of Dynamical Electrocardiograph, especially the pre-amplifier with high CMRR and high input impudence.

然后重点论述了动态心电仪的软硬件设计和研制，特别是关于高共模抑制比和高输入阻抗的前置放大器的部分；同时也介绍了颇具特色的通讯电路和电源电路的实现。

On the basis of the understanding of electrocardiogram principle and technology of diagnosing, have designed the input channel composed of AD converters inlaid in the pre-amplifier, wave filter and one-chip computer.

基于对心电图原理及其诊断技术的理解，设计了由前置放大器、滤波器和单片机内嵌的AD转换器组成的输入通道。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。