High-precision analog-to-digital converters (ADC’S) are sought for digital audio and instrumentation and high-speed converters for video applications. Improved methods of converter testing at full speed are needed. This paper describes improved computer-aided ADC characterization methods based on the code density test and spectraf analysis using the fast Fourier transform (FFT). The code densit...

We report on an 8-bit successive approximation analog-to-digital converter (SA-ADC) that was designed and fabricated in 0.5m silicon on sapphire CMOS technology. The SA-ADC is capable of 32-MHz operation, providing 1.23-MS/s conversion rates, and consumes 800 W at 3.3-V supply. The lack of substrate parasitic capacitances enables the use of small-area capacitors and reduces the noise coupling t...

A 2-digit higher radix analog-to-digital converter (ADC) circuit consisting of a combination of a pipelined ADC and a set of cascaded current comparator cell has been proposed. The ADC generates multi-valued logic outputs rather than the conventional binary output system. The design is implemented using 0.25μm CMOS process. The performance analysis of the design shows desirable performance para...

An internally analog, e x t e d y digital architecture for matrix-vector multiplication is presented. Fully parallel processing allows for high data throughput and minimal latency. The analog architecture incorporates an array of chargemode analog computational cells with dynamic storage and mwparallel fiash analog-to-digital converters (ADC). Each of the cells includes a dynamic storage elemen...

There is a general need for spacecraft systems to make use of advances in analog to digital (ADC) and digital to analog (DAC) technologies. In particular, imaging systems such as star trackers and remote sensing instruments require 14,16, or more bits ADCs that have low power consumption, fast conversion rates (>1 MSPS) and good radiation tolerances. Because ADC and DAC have both analog and dig...

A direct resistance-to-digital converter (RDC) that is suitable for differential resistive sensors is proposed and analyzed in this paper. The RDC presented here provides a digital output that is linearly proportional to the parameter being sensed by a differential resistive sensor possessing either linear or inverse characteristics. The RDC employs the sigma–delta analog-todigital conversion (...

The paper presents the implementation of analog data acquisition system, in particular controlling with a 6channel ADC converter AD7656 via the FPGA Xilinx Spartan 3 series. The procedures for data sending from the ADC to the FPGA buffers, their conversion and subsequent transmission to TigerSHARC DSP are described. The digital representations of ADC analog input signals are sent to the FPGA th...

This paper presents the impact that gain, offset and timing mismatch in time-interleaved analog-to-digital converter (TIADC) have on digital receiver systems. An analysis of the mismatch errors shows the dependency of the different errors from the spectrum of the input signal. A discrete-time TIADC model is derived allowing to simulate the mismatch effects of the individual ADCs. Finally, simul...