A zero-drift amplifier, as the name suggests, is an amplifier with offset voltage drift very close to zero. It uses auto-zero or chopping technology, or a combination of both, to continuously self-correct for DC errors over time and temperature. This enables the amplifier to achieve microvolt-level offsets and extremely low offset drifts. Therefore, it is uniquely suited to be used in signal co...

We have implemented a new experimental set-up for precise measurements of current fluctuations in three-terminal devices. The system operates at very low temperatures (30 mK) and is equipped with three superconducting quantum interference devices (SQUIDs) as low noise current amplifiers. A SQUID input coil is connected to each terminal of a sample allowing the acquisition of time-dependent curr...

In order to improve both resolution and stability of single bit high order Sigma-Delta Modulators, quantization noise suppression should be carried out not only at DC but also within the bandwidth of interest. This noise suppression at frequencies different from zero is carried out with the use of resonators. Switched-Capacitor resonators at fS/n can be designed using integrating or delaying el...

A zero-drift amplifier, as the name suggests, is an amplifier with offset voltage drift very close to zero. It uses autozero or chopping technology, or a combination of both, to continuously self-correct for dc errors over time and temperature. This enables the amplifier to achieve microvoltlevel offsets and extremely low offset drifts. Therefore, it is uniquely suited to be used in signal cond...

Power amplifiers, an integral component to most wireless communication systems, are inherently nonlinear devices that introduce out-of-band spectral regrowth and constellation degradation to the amplifier output. One solution is to operate in a highly backed-off state to achieve quasi-linear performance. Operating in this region requires a higher-saturated power rating for a given output power ...

ETRI Journal, Volume 28, Number 3, June 2006 ABSTRACT—Monolithic SiGe heterojunction bipolar transistor (HBT) variable gain amplifiers (VGAs) with a feedforward configuration have been newly developed for 5 GHz applications. Two types of the feedforward VGAs have been made: one using a coupled-emitter resistor and the other using an HBT-based current source. At 5.2 GHz, both of the VGAs achieve...

This paper presents the design, analysis, and simulated results of a three stage low power op-amp in a 0.25μm CMOS process technology. The op-amp overcomes the problems of cascading stages under low supply voltage by using modified active-feedback frequency compensation. This op-amp operates over a common-mode voltage (Vcm)from 0 to 0.6V, a supply voltage (Vdd) of 1.5V ±5%, a temperature range ...

Insulator-based dielectrophoresis enables contact-less separation and analysis of biosystems, but it is unable to operate effectively in the MHz frequency range, which is necessary for the manipulation of biological cells based on the characteristic electrophysiology of their cytoplasm or biomolecular preconcentration based on their unique conformation. To address the steep drop in output power...

This paper presents a novel stereo enhancement structure for the surround stereo class-D audio amplifier. The principle of this stereo enhancement scheme has been analyzed. It shows that the amplifier with this proposed circuit have a better live effect than the traditional class-D audio amplifiers. In this circuit, the input audio signal from one channel can be amplified in the two channels at...