Articles - Amplifiers - 2

Xiyao Zhang, Texas Instruments Early in my graduate school education, I was working on a project that needed a unity-gain operational-amplifier (op-amp) buffer for a monitoring circuit in our thin film deposition system. As soon as the new module ...

Gustavo Castro, Analog Devices Analog Dialogue Question: Why is the effect of common-mode signals at the output larger than the CMRR specification? Answer: The concept of common-mode rejection ratio (CMRR) is fundamental when working with ...

Jennifer Calhoon Design World A charge amplifier is not the most common type of amplifier, but very useful in the right circumstances, it is really a current integrator which produces a voltage output proportional to the integrated value of the ...

Loren Siebert, Texas Instruments As high-speed systems become more complex and design cycles become shorter, engineers need to find high-performance yet flexible components to facilitate their system designs. One method is to use components that ...

Surprise, surprise. The bandwidth of an amplifier in a gain of +1 V/V is not the same as the bandwidth of the same amplifier in a gain of 1 V/V. After more than five years of working every day with amplifiers for an industry analogue leader, this ...

Roy McCammon EDN The traditional three op-amp differential amplifier's signal to noise ratio can be improved by 6 dB by adding a resistor and slightly changing the connections. There is a trade-off though: The traditional topology has a high input ...

By Charly El-Khoury, Analog Devices This article shows how compensating an amplifier - such as the ADA4895-2 , which is normally stable for a gain higher than +9 -to operate with a gain as low as +2 provides higher slew rate and faster settling ...

Vic Jordan, Carson City, NV It’s common practice to series-terminate an op amp to match the impedance of the load. This practice causes a 3-dB loss of output power in the termination resistance, however (Figure 1). Newer op amps operating on ...

Part 1 A hands-on test A comparison of a bipolar op amp and a CMOS op amp from Analog Devices and three of its major analog competitors quantifies effect described in the previous section (Table 1). The comparison includes National Semiconductor ...

Understand what this common, important parameter really means and why it may be much higher than you see on the data sheet. Most ICs’ data sheets list a maximum supply current, but manufacturers often overlook the measurement conditions. For ...