Offset cancelling circuit
TL;DR: In this paper, a monolithic offset cancellation circuit was proposed to reduce the offset voltage at an integrated audio-amplifier output using a low-pass filter with a very large time constant for which only one small on-chip capacitor is needed.
read more
Abstract: A monolithic offset cancelling circuit to reduce the offset voltage at an integrated audio-amplifier output is described. This offset voltage is detected using a low-pass filter with a very large time constant for which only one small on-chip capacitor is needed. The circuit was realized with a bipolar cell-based semicustom array. Measurements have shown that a -3-dB bandwidth below 5 Hz can be realized with a capacitor value of 50 pF. The resulting offset voltage at the audio-amplifier output was 2.5 mV. The offset cancelling circuit increases the wideband noise voltage at the audio-amplifier output by 0.15-MV RMS over the frequency range of 10 Hz to 30 kHz. The use of the offset cancelling circuit eliminates the need for a large external electrolytic capacitor. If an audio amplifier with a single supply voltage is used, a second electrolytic capacitor, needed to obtain a stable reference at half the supply voltage, can be eliminated. >
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Circuit techniques for reducing the effects of op-amp imperfections: autozeroing, correlated double sampling, and chopper stabilization
Christian Enz,Gabor C. Temes +1 more
- 01 Nov 1996
TL;DR: In this paper, some old and new circuit techniques are described for the compensation of the amplifier's most important nonideal effects including the noise (mainly thermal and 1/f noise), the input-referred dc offset voltage as well as the finite gain.
2K
Patent
Variable gain amplifier
Takashi Ueno,Tadashi Arai,Tetsuro Itakura +2 more
- 02 Aug 2002
TL;DR: In this article, a variable gain amplifier (VGA) is defined as a device that amplifies a difference between an input signal and a feedback signal to output an output signal.
159
Integrated continuous-time filter design
Yannis Tsividis
- 09 May 1993
TL;DR: In this paper, the state of the art of continous-time filter design is reviewed and several techniques are discussed and compared in terms of performance and implementation feasibility in different fabrication technologies; the bulk of this review is devoted to device-level integrator-based filter design, although other techniques also mentioned.
138
Patent
Differential DC offset compensation circuit
Gary L. Pace,James David Hughes +1 more
- 18 Oct 1994
TL;DR: In this article, a differential direct current offset compensation circuit for providing DC offset compensation to a circuit device (110) is described, which is one of several types of devices, such as a DC coupled amplifier.
115
Patent
Sensor readout detector circuit
Dahlon D. Chu,Donald C. Thelen +1 more
- 26 Feb 1997
TL;DR: In this article, a sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level.
108
References
Limitations on the Integration of Analog Filters for Frequencies Below 10 Hz
W.H.G. Deguelle
- 01 Sep 1988
TL;DR: Possibilities and limitations are considered of realizing integrated analog filters with cut off frequencies below 10 Hz and it is recognized that for a given supply voltage electronic multiplication reduces the dynamic range because of noise-and DC-offset multiplication.
24
Wideband Voltage-Current Converter Circuit
Evert Seevinck,R.F. Wassenaar,M.G. van Leeuwen,G. Boom,E. Holle,Ron van der Wal +5 more
- 01 Sep 1985
TL;DR: A wideband voltage-current converter circuit with nonlinearity-error compensation with new bipolar cell-based semicustom array intended for use in training as well as for industrial prototyping and custom IC production.
14