The development of 14 bit monolithic Analogue to Digital Converters (ADC’s) capable of sampling at 80 MHz has revived interest in digitising the entire 3-30 MHz High Frequency (HF) radio spectrum for use in wideband HF receivers. This enables the ADC to be placed close to the antenna so removing the need for analogue mixing as well as offering a multi-channel reception capability, using multiple digital synthesisers and direct conversion I, Q mixing to baseband...
Superconductor ADCs exist and their performance is quickly approaching to those of the best semiconductor counterparts. Deep cooling could complicate a broad spreading of the still exotic superconductor technology. However, the technology is highly attractive for invention or at least numerical simulations of novel conversion schemes.
This paper deals with testing of ultra-low distortion sine wave generators. Measurement of harmonic distortion based on lock-in amplifiers is described and practical results using fundamental-suppression method are presented.
The paper analyses the measurement accuracy of selected parameters, such as flow velocity and temperature, of a flowing medium, by means of the thermoanemometric method. The core of the method relies on the Wave Thermoanemometer System constructed by one of the authors. The sources of boundary error components are analysed within the signal conversion channels of the WTS. Errors are examined by means of relevant mathematical expressions representing signal conversion both in the velocity measuring channel and in temperature measuring channel. The algorithms have been developed for perfect...
The paper presents a mathematically grounded approach to the analysis and optimisation of multi-pass analogue-to-digital converters (MADCs) with the algorithmic forming the estimates of converted samples. The approach enables a comprehensive analysis of the converter work using a virtual model of MADC built on the basis of its mathematical model. This model is based on the extended optimal identification algorithms adapted to the particularities of A/D conversion. The obtained sub-optimal algorithms take into account all main parameters of the internal auxiliary ADC and other analogue...
In design of the DSP for acoustic applications it is appropriate to integrate a low-cost audio codec into their structure. Audio stereo codecs are able to achieve a high resolution of measurement on low frequencies of the input signal. But audio codecs are able to digitalize only signals of the acoustic origin, it means the signal without the DC part of frequency spectrum. In the majority of available DSP there are 2 independent AD converters and also 2 DA converters. But most of audio codecs create the DC offset during the conversion to the digital form, it means 0V voltage amplitude of...
The paper describes the design of a 1GS/s 6-bit ADC in SiGe BiCMOS technology. Several techniques such as subranging, interpolation and averaging were implemented on the original flash architecture in order to achieve low power consumption without sacrificing linearity and dynamic performance.
For investigation and training of students in the field of high resolution measurement technology was built an embedded measurement system with 16 bit resolution and additional modules for self-diagnostics and autocorrection, including a monitoring measurement system for evaluation.
The paper presents some ideas and results from the attempt to create a comprehensive suite of data processing, C-language functions that enables simplifying the development of new, user oriented software for testing analog to digital converters according the IEEE standards 1057, 1241 and DYNAD. The developed function class covers both dynamic and histogram based test methods. Nowadays, it is prepared in the form of instrument driver - function panel (*.fp) for the software development package Lab Windows⁄CVI by National Instruments. All functions were developed, debugged and tested in this...