Circuits & Schematics - Amplifiers - 3

Current-feedback amplifiers offer high bandwidth with minimal power-supply current draw. However, they're rarely used as transimpedance amplifiers in photodiode applications due to the high current noise of their inverting inputs. The Figure 1 ...

Although monolithic instrumentation amplifiers are more cost-effective than their discrete and modular predecessors, the limited variety of monolithic instrumentation amps restricts their use. You can widen your options, however, by deriving the ...

Modern battery-cell voltages of 3 to 3.6 V require circuits that offer efficient low-voltage operation. This Design Idea proposes an ac-coupled instrumentation-amplifier design that features high CMRR (common-mode-rejection ratio), wide dc ...

AGC (automatic-gain-control) amplifiers use the nonlinear characteristics of control devices. The magnitude of the real component in some of their differential parameters changes depending on variations in their dc operating points. A typical ...

Amplifying the human voice presents some tough challenges. One of the toughest of these is providing enough amplification to make sure a soft-spoken person can be heard while allowing sufficient headroom for people who speak loudly. If the ...

Inspired by the excellent idea shown in the article “Class AB 20-W current booster is insensitive to temperature variations” by Jordan Dimitrov ( Ref. 1 ), this variation of the design shown in Figure 1 enables an amplifier that can ...

Class AB amplifiers have been the workhorses of the audio world, thanks to their simplicity, and their ability to deliver high power levels with low distortion. But there are also a number of gremlins that lurk within the AB architecture, mostly in ...

The absolute-value amplifier is a basic building block in test-and-measurement and signal-processing applications. The addition of a DPP (digitally programmable potentiometer) adds another dimension, G (gain), to this key circuit. Because the gain ...

A widely-used push-pull configuration of an AB class amplifier is shown in Figure 1, but it needs some improvements. Figure 1. This configuration of an AB class amplifier have some improvements. First of all, let’s take a look how its thermal ...

The circuit in Figure 1 powers a microparticle and nanoparticle ion trap through a 1-to-5-turns-ratio, high-voltage transformer. It also works successfully as a driver for a piezo-tube scanner and in a near-field scanning optical microscope. The ...