摘要:
Disclosed herein are systems and methods that describe statistical estimation based noise reduction for SAR ADCs. For SAR ADCs, the conversion error can be available at the comparator input. Although a noisy 1-bit comparator may not be able to produce an accurate estimation for its input if used only once, the comparison can be repeated multiple times for a designated bit of the multi-bit SAR ADC. This can allow for the improvement of the estimation accuracy by examining the probability of the comparator output being "1" or "0". The estimation of a signal from a noisy environment using multiple trials can be cast as a classic. In one aspect of the disclosure, an optimal Bayes estimator is disclosed to achieve a low estimation error from the comparator on a designated bit of the multi-bit SAR ADC.
摘要:
An energy-efficient capacitance-to-digital converter (CDC) is provided that utilizes a capacitance-domain successive approximation (SAR) technique. Unlike SAR analog- to-digital converters (ADCs), analysis shows that for SAR CDCs, the comparator offset voltage will result in signal-dependent and parasitic-dependent conversion errors, which necessitates an op-amp-based implementation. The inverter-based SAR CDC contemplated herein provides robust, energy-efficient, and fast operation. The inverter- based SAR CDC may include a hybrid coarse-fine programmable capacitor array. The design of example embodiments is insensitive to analog references, and thus achieves very low temperature sensitivity without the need for calibration. Moreover, this design achieves improved energy efficiency.
摘要:
Die Erfindung betrifft eine Vorrichtung zum Digitalisieren eines analogen Signals, wobei ein Verzerrsignal-Ausgang eines Verzerrsignal-Generators ausschließlich mittels passiver Komponenten an einen Analog-Digital-Konverter gekoppelt ist.
摘要:
An apparatus for calibration of a signal converter is disclosed. This apparatus includes a first digital-to-analog converter ("DAC") (510) and a calibration system (520) coupled to an output port of the first DAC (510). The calibration system includes a second DAC (602, 612). The calibration system (520) is configured to provide an adjustment signal responsive to a spurious spectral performance parameter in an output of the first DAC (510). The spurious spectral performance parameter is sensitive to a timing error associated with the first DAC (510). The calibration system (510) is coupled to provide the adjustment signal to the first DAC (510) to correct the timing error of the first DAC (510).
摘要:
The invention provides a method and a module for estimating a plurality of relative channel-error d k , G k, C k for at least one signal X k with respect to a reference signal X 0 . The signals X 0 and X k are produced by an analog-to-digital module 10 comprising parallel and time interleaved analog-to-digital converters and are received by an estimation module 20. The method is performed by said estimation module 20 and it comprises the steps of: defining Sl a function F(d k ,G k ,C k ) representing a relationship between said reference signal X 0 and an arbitrary signal X k in said group of signals X 0 -X N-1 ; selecting S2 a first reference signal X 0 in said group of signals X 0 - X N-1 . The method comprises the further steps of: selecting S3 a second signal X k from the remaining signals X 1 - X N-1 in said group; and optimizing S4 the function F{d k , G k , C k ) so as to obtain an estimate d k , G k , C k of said plurality of relative channel-error d k , G k , C k ; repeating said further steps for each remaining signal X1 - X N-1 .
摘要:
A device includes an amplifier and calibration circuitry coupled to the amplifier. The calibration circuitry is configured to receive calibration values. The calibration circuitry is also configured to generate an output value in response to receiving a timing input.
摘要:
A method for measuring a voltage using a capacitive voltage divider (CVD) and an analog-to-digital converter includes the steps of measuring a bandgap or reference voltage and determining a first code value of the bandgap or reference voltage, charging a first capacitor to a voltage to be measured and determining a second code value of voltage of the first capacitor, charging a second capacitor to a second known voltage and determining a third code value of voltage of the second capacitor, and determining the voltage to be measured by applying the first, second, and third code values.
摘要:
The invention relates to a signal processing system, comprising at least a first, a second and a third digital-to-analog converter (31-33) (DAC); a processing unit (21) configured for splitting a sampled signal into a first and a second signal corresponding to different frequency portions of the sampled signal, transmitting the first signal to the first DAC (31), splitting the second signal into a first and a second subsignal and transmitting the first subsignal to the second DAC (32) and the second subsignal to the third DAC (33), the first subsignal corresponding to the real part of the second signal and the second subsignal corresponding to the imaginary part of the second signal; an IQ mixer (600) configured for mixing an analog output signal of the second DAC (32) and an analog output signal of the third DAC (33) and a combiner (4) for combining an analog output signal of the first DAC (31) and an output signal of the IQ mixer (600). The invention further is related to methods of signal processing.