Articles Analogue Design

Manual amplifier nulling circuits are simple topologies, typically consisting of just a trimmer pot and a couple of fixed resistors intended to allow offset adjustment by a (usually small) symmetrical fraction of bipolar supply voltages. So, ...

In many electronic circuits, there is always a demand for a device to isolate or separate one circuit from another. This special device is called a buffer. A buffer is a unity-gain amplifier that has an extremely high input resistance and an ...

Modern measurement systems often operate with single 5-V power supplies, yet their input signals may have large common-mode voltages that exceed the supply by tens or hundreds of volts. Also, unless the converter is driven differentially, the noise ...

Many precision test-and-measurement and high-speed analog applications require an exact targeted voltage to be delivered to the device under test or intended load to accurately analyze the device. Design and test engineers are well-aware that this ...

When you include a power op amp, such as PA05 from Apex Microtechnology, in your design, it is desirable to minimize the supply-to-output differential to a minimum to reduce power dissipation and to fully exploit the amplifier's output range. ...

This article describes a technique to compensate the DC voltage drift in the output of a directly-coupled AB-Class audio power amplifier. The main benefit of a directly-coupled output is improved bass response. Since the design eliminates the ...

While choosing an op-amp buffer for a new high-resolution single-supply DAC, a source of negative supply was considered because the buffer op-amp had to provide true zero voltage on its output. For instance, a typical rail-to-rail output op-amp ...

There are two basic filter topologies that everyone recommends when they start to design their signal chain: multiple-feedback (MFB) or Sallen-Key topologies. But what are the differences and why would you choose one over the other? MFB filtering ...

Sometimes, the need arises for a low-distortion buffer amplifier capable of handling bipolar signals. You can use an op amp or integrated buffer for these applications, but for more flexibility, a discrete design may prove useful. Applications ...

A Zobel network is useful in making a reactive load appear as a pure resistance to a driving source prone to stability problems ( Reference 1 ). A typical situation is an audio power amplifier driving a loudspeaker, modeled at first approximation ...