What is the use of broadband DC amplifier in production and life?

In modern electronic equipment, communication equipment and scientific research and production, it is often necessary to use amplification circuits to transfer sensors.

Sensor. Any device that uses certain physical properties (physical, chemical, biological) laws, theorems, laws, effects, etc., to convert physical or chemical quantities into electrical signals that are easy to use. A sensor is a front-loading component in a measurement system that converts input variables into signals that can be measured."

According to Gopel et al., "a sensor is a sensitive element that includes a carrier and a circuit connection", while "a sensor system is a system that combines some kind of information processing (analog or digital) capability". The sensor is an integral part of the sensing system, and it is the first gate for the input of the measured signal.

The weak signal output or the weak signal received by the communication receiver in the air are extracted and amplified. Only by amplifying the signal to a certain extent can the requirements of the post-stage equipment be met and the analysis results correct. At the same time, many devices also require a certain output power to drive the backstage equipment or enable the transmitter of the communication to effectively transmit the signal to the receiver.

However, in the face of a variety of amplification requirements, it is difficult for the current amplification circuit to meet the design requirements in terms of frequency band, gain dynamic range, power and other parameters. To this end, a wideband DC amplifier is designed, which has a frequency from 0 Hz to 10 MHz, a gain adjustment range of 0 75 dB, a bandwidth that can be set to 5 MHz or 10 MHz, and a post-amplification circuit that can output a peak-to-peak value of 20 V. The system has low cost and high precision, meets the requirements of general production and scientific research experiments, and can be applied to a variety of occasions and has popularity.

Let me ask you a question:

Q, what is the use of surgical dissecting forceps in life?

A DC broadband amplifier is a part of the whole circuit.

It can be used in equipment such as oscilloscopes, signal generators, spectrum analyzers, etc.

It is a basic circuit with relatively high requirements.

The minimum limit of the signal frequency that can be amplified by a wideband DC amplifier can reach 0Hz, which is directly coupled and has a wide operating frequency range.

Broadband amplifier only works in a wide frequency range, may not be able to effectively amplify DC signals or low-frequency signals, such as its coupling mode is direct coupling, that is, broadband DC amplifier, if it is capacitive coupling, it can not effectively amplify DC signals or low-frequency AC signals.

Broadband Amplifier Broadband Amplifier.

wide-band amplifier

An amplifier circuit in which the ratio of the upper and lower operating frequencies is much greater than 1. It is also customary to include amplifiers with relative band widths greater than 20 30 in this category. This type of circuit is mainly used to amplify ** signals, pulse signals or radio frequency signals.

The amplifier used for the amplification of television image signals is a typical baseband type broadband amplifier, and the frequency range of the amplified signal can range from a few hertz or tens of hertz to a few megahertz or tens of megahertz high frequencies. This type of amplifier usually uses a resistor as the load of the amplifier and a capacitor as the interstage coupling. In order to extend the bandwidth, in addition to making it less gain, it is often necessary to compensate for high and low frequencies so that the flat portion of the gain-frequency characteristic curve of the amplifier is extended to both ends.

Wideband amplifiers can also be classified as baseband amplifiers or pulse amplifiers (bandwidths from a few hertz to tens or hundreds of megahertz) for time division multiplexing, oscilloscopes, digital circuits, etc., DC amplifiers for measuring instruments (bandwidths from DC to several kilohertz or more), and high-fidelity audio amplifiers in audio equipment (bandwidths from a few tens of hertz to tens of kilohertz). Wideband amplifiers (mostly bandpass) used for RF signal amplification, such as intermediate frequency amplifiers in radar or communication receivers, have a center frequency of tens of MHz or hundreds of megahertz, and the passband width can reach tens of percent of the center frequency.