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Patent

Processor controlled analog-to-digital converter circuit

Tzi-Hsiung Shu, +1 more
TLDR
In this article, an analog-to-digital converter (ADC) and one or more switched capacitor amplifier stages are connected together in series, with the first stage serving as a sample and hold circuit for the ADC.
Abstract: 
Then circuit includes an analog-to-digital converter (ADC); and one or more switched capacitor amplifier stages connected together in series with a first switched capacitor amplifier stage for receiving the analog input signal, and a last switched capacitor amplifier stage connected to the ADC. Moreover, each of the plurality of switched capacitor amplifier stages preferably has a selectable gain to permit control of an overall gain of the analog input signal upstream of the ADC. In addition, the first stage may also serve as a sample and hold circuit for the ADC. In one embodiment, the circuit may comprise an integrated circuit substrate on which the ADC and the plurality of switched capacitor amplifiers are formed so that the analog-to-digital converter is a monolithic integrated circuit. The circuit may also control the gain of each of the plurality of switched capacitor amplifier stages based upon a digital gain control word. A clock is preferably operatively connected to the ADC and the plurality of switched capacitor amplifier stages. Accordingly, gain control word changes cause relatively rapid changes in the overall gain.

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Citations
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Patent

Integrated circuit device and electronic instrument

Takashi Kumagai, +8 more
TL;DR: In this article, the first to Nth (N is an integer larger than one) divided data line driver blocks are disposed along a first direction in which the bitlines extend, each of which drives a different data line group of the data line groups.
Journal ArticleDOI

Digital cancellation of D/A converter noise in pipelined A/D converters

Ian Galton
- 01 Mar 2000 - 
TL;DR: It is demonstrated that in the presence of realistic component matching limitations the technique can improve the overall ADC accuracy by several bits with only moderate digital hardware complexity.
Patent

Analog to digital conversion circuitry including backup conversion circuitry

Eric J. Swanson
TL;DR: In this paper, an analog-to-digital conversion system is described, which includes a digitally programmable preamplifier for amplifying a difference between an analog input and an estimate of the analog input.
Patent

Autoranging analog to digital conversion circuitry

Eric J. Swanson
TL;DR: In this article, an autoranging analog to digital conversion system is provided, which includes a digitally programmable preamplifier for amplifying a difference between an analog input and an estimate of the analog input.
Patent

Analog gain control adjustment using a probabilistic algorithm

Gwendolyn Kate Harris, +1 more
TL;DR: In this paper, the amplitude of a received discrete multi-tone analog signal contaminated by radio frequency interference from radio stations in the AM band is adjusted by controlling an analog gain controller in order to utilize substantially all of a dynamic input range of an analog to digital converter to reduce the quantization noise of the output digital signal.
References
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Patent

Delta sigma modulator having programmable gain/attenuation

Damien McCartney, +1 more
TL;DR: In this paper, a delta signma modulator is programmable to realize a number of different gain settings, such as selecting the rate of sampling of an analog input relative to sampling of a reference voltage and/or interspersing of samples of fixed voltage with the analog input or reference voltage.
Patent

Delta sigma analog-to-digital converter having programmable resolution/bias current circuitry and method

Binan Wang, +2 more
TL;DR: In this paper, a delta sigma analog-to-digital converter with programmable resolution/bias current control circuitry is described, where a clock generator is used to supply a clock signal to the input sampling circuit and a feedback sampling circuit at a sampling frequency determined by a sampling-frequency control signal.
Patent

Signal processing circuit including a variable gain input stage

Olivier Nys, +1 more
TL;DR: In this paper, the authors describe a processing circuit for producing a variable output signal in response to a variable quantity picked up or received as input, which is associated with a stage or has an input sensor furnishing a signal with a variable amplification/attenuation factor, and further exhibits response characteristics which depend in particular from state variables.
Patent

Offset-insensitive switched-capacitor gain stage

Jr. Paul F. Ferguson
TL;DR: In this paper, a programmable programmable gain stage has a reference input terminal which is connected through an IC chip pin to an external capacitor the other electrode of which is returned to signal common, which develops a d-c voltage corresponding to the offset voltages of the operative buffer amplifier and the op-amp.
Patent

Frequency-controlled variable-gain amplifiers

John L. Bradshaw
TL;DR: In this article, an automatic gain control system (AGC) having a frequency controlled variable gain amplifier stage whose stage gain is a function of a frequency signal applied to a gain control input of the amplifier stage is described.