In this paper we consider the generation of discrete white noise. Despite this seems to be a simple problem, common noise generator implementations do not deliver comparable results at different sampling rates. First we define what we mean with “comparable results”. From this we conclude, that the variance of the random variables shall grow proportionally to the sampling rate. Eventually we con...

Introduction In recent years, the noise performance of CMOS image sensors has improved significantly with the implementation of a multiple sampling architecture [1-3]. In the multiple sampling architecture, the thermal noise of the pixel source follower can be reduced by a factor equal to the square root of the sampling number. The multiple sampling architectures usually employ single slope (SS...

The sample rate conversion algorithm based on variable fractional delay filters is often used if the resampling ratio cannot be expressed as the ratio of small integer numbers or if it is not constant. The main advantage of such solution is that it allows for arbitrary resampling ratios which can even be changed during the resampling process. In this paper a discussion on influence of different...

In this paper we proposed an efficient structure for sampling rate conversion by rational factor of L/M, where L is upsampling factor and M is downsampling factor. In this method, the coefficient symmetry of the linear phase filter is used. In this way, the number of required multiplications per output sample is reduced. For implementation we use linear phase FIR filter. The symmetric FIR filte...

Sampling rate conversion in multirate filter banks leads to time-varying phenomena, which differ between deterministic and stationary random signals. More specifically, downsampling causes deterministic signals to become periodically shift variant, while upsampling turns stationary random signals into cyclostationary signals. We provide criteria for the quantification of these effects, and comp...

Software radio is an enabling technology for future radio transceivers, allowing the realisation of multimode, multiband, and reconfigurable base stations and terminals. This paper describes work comparing two suitable methods of downconverting RF signals to baseband, which may be used in software radios. These are direct conversion and bandpass sampling. The performance of each method is evalu...

In this paper, we present the application of the Elliptic Minimal Q-Factors (EMQF) subfilters in constructing IIR multirate filters. We show that using EMQF subfilters, efficient implementations are reached for the sampling rate conversion systems, multistage filtering, and tree structured IIR filter banks. It is demonstrated through examples that the proper use of EMQF subfilters provides effi...

Successive – Approximation ADCs are widely used in ultra – low – power applications. This paper describes a systematic design procedure for designing Successive – Approximation ADCs for biomedical sensor nodes. The proposed scheme is adopted in the design of a 12 bit 1 kS/s ADC. Implemented in 65 nm CMOS, the ADC consumes 354 nW at a sampling rate of 1 kS/s operating with 1.2 supply voltage. Th...

The performance of electronic analog-to-digital converters (ADCs) at high sampling rates is fundamentally limited by the timing jitter of electronic clocks. To circumvent this limitation, one method is to exploit the orders-of-magnitude lower timing jitter of mode-locked lasers and implement optical sampling as a front-end for electronic ADCs. The optical-sampling, wavelength-demultiplexing app...

Analog-to-digital conversion (ADC) has been widely studied as a key interface technology to connect continuous analog signals and manageable digital signals. Recent tremendous growth of high-speed digital signal processing and communication systems has encouraged the demand for a high-speed ADC. For the realization of a high-speed ADC, optical approaches have much attracted recently [1]. ADC co...