After decades of development, the mobile phone signal booster operation has evolved from the early vacuum tube to the current integrated circuit. According to different application requirements, it is mainly divided into four categories: general-purpose type, low-voltage/low-power consumption type, high-speed type, and high-precision type. Op amp products. Generally speaking, high-speed op amps are mainly used in communication equipment, video systems, and test and measurement instruments; low-voltage/low-power op amps are mainly used for portable electronic products powered by batteries such as mobile phones and PDAs; high-precision op amps are mainly used for battery-powered portable electronic products. For test and measurement instruments, automotive electronics and industrial control systems. General-purpose computing is the most widely used, and general-purpose op amps can be used in almost any electronic system that needs to add simple signal gain or signal conditioning. The rise of emerging applications such as information appliances, mobile phones, PDAs, and networks has provided an active stage for computing, but also put forward new technical requirements for it.

    There are three main drivers for future market growth: First, the low power requirements of portable applications will drive growth with low operating supply voltage/current; ; Third, as performance and price pressures continue to rise, the prospect of being able to integrate other functions is optimistic. Advanced applications in test and measurement, communications, medical imaging, and more are the main drivers for improved performance; DSL and consumer video applications are the largest markets and will continue to do so in the future. Among them, the growth point of DSL operational amplifier mainly lies in the line driver. And consumer video that integrates filtering, multiplexing, and DC restoration is also favored. From an application point of view, different systems have different requirements for op amps, and choosing a suitable op amp is crucial for system design. For high-speed applications such as communications, high-speed measurement instruments, and ultrasonic equipment, AC characteristics are extremely important. But for low-speed, high-precision systems, the DC aspect is usually more important. The parameters that measure the AC characteristics of the system include signal bandwidth, distortion rate, noise, etc.; and the parameters that measure the DC characteristics of the system include input compensation voltage, open-loop gain, input bias current, and common mode rejection ratio.

Cell Phone Signal Amplifier Communications and Video Applications Bring High-Speed Op Amp to the Focus

    High-speed op amps generally refer to op amps with a bandwidth higher than 50MHz, and now in order to match the needs of the back-end components of the signal chain (such as high-speed ADCs or processors), the bandwidth record of op amps has exceeded GHz. This is mainly because the performance of back-end components has been significantly improved in recent years. Therefore, in order to match the front-end components of the signal chain to avoid dragging down the overall performance of the signal chain, the op amps at the front end of the signal chain have begun to develop at a high speed. Op amps may jump to mainstream op amp products. In general, high-speed op amps are mainly used in xDSL modems, set-top boxes, and video systems, or serve as front-end signal conditioning for high-speed ADCs. This type of op amp has the most stringent requirements on signal-to-noise ratio and distortion, so semiconductor manufacturers generally use the form of differential output when designing this type of op amp. 

    Compared with the traditional "two-in-one-out" architecture, the differential output of "two-in-two-out" outputs two out-of-phase signals at the same time, so the system engineer can know the output signal by comparing the two signals. The waveform of the amplifier before it is affected by noise or distortion, allowing the design engineer to solve problems that may arise in the signal chain in time.

Portable applications enable low-voltage/low-power computing

    With the emergence of portable products such as mobile phone signal repeater and PMPs that rely on battery power, op amps that emphasize low power consumption and low voltage emerge as the times require. The low-voltage op amp under the general definition refers to the operating voltage below 2.5 volts, while the so-called low-power op amp usually refers to the supply current below 1 mA. This type of op amp is mostly used in audio systems or voltage comparison circuits, filters and other applications that do not require too high bandwidth. In addition, in test, measurement, and medical systems, engineers also want improved performance at low power levels (eg, higher bandwidth, faster slew rate, and lower distortion), so in these areas low power Op amps also have opportunities for innovation.

    For the old community, the stair-type residence is equipped with an elevator. The mobile phone call signal in the elevator equipment cannot be guaranteed, and the operator will not respond to the needs of the coverage and installation of engineering equipment. Therefore, a single multi-frequency host of the civilian market equipment can easily realize the three-network call, and even the functional requirements of full Netcom.