A method of sampling jitter measurement based on time-domain analytic signals is proposed. Computer simulations and actual measurements were performed to compare the proposed method with the conventional method, in which jitter is evaluated from the amplitudes of sideband spectra for observed signals in the frequency domain. The results show that the proposed method is effective in that it 1) p...

We are developing special-purpose, low-power analog-to-digital converters for speech and music applications, that feature analog circuit models of biological audition to process the audio signal before conversion. This paper describes our most recent converter design, and a working system that uses several copies of the chip to compute multiple representations of sound from an analog input. Thi...

element (pixel) of the sensor array. The spatial resolution of Landsat Thematic Mapper data is 30 x 30 meters for each of six visual and infrared (IR) bands and 120 meters for one thermal IR band. SPOT delivers 10 meter spatial resolution from one panchromatic band and 20 meter data from three multispectral bands. Raw imaging data transmitted by the satellite typically undergoes a series of pre...

We present work toward the development of a digital to analog (DAC) conversion scheme to efficiently achieve the bit-depths required in high performance infrared scene projection. This is achieved by appropriately dividing the conversion amongst the close support electronics (CSE), the periphery of the read-in integrated-circuit (RIIC) chip, and the pixel drive circuitry.

A radix-based digital self-calibration technique for multistage analog-to-digital converter(ADC) is presented. This technique can correct errors due to capacitor mismatch and finite opamp gain. The equivalent radix of each stage is extracted by measuring the discontinuity on the ADC transfer curve and iteratively adjusting the equivalent radix to minimize this discontinuity. A much more accurat...

Capacitor mismatch is the main source of nonlinearity for pipelined analog-to-digital (A/D) converters. Here a digital erroraveraging technique is presented to greatly reduce this effect. Compared to the conventional circuit, the new approach requires only one extra digital addition. This allows a very simple and compact implementation. On the other hand, the conversion speed is halved because ...

An 80MS/s analog-to-digital converter (ADC) based on single-slope conversion is presented which utilizes a recently developed gated ring oscillator (GRO) time-to-digital converter (TDC) to achieve an ENOB of 6.45 bits. To save power, the time-to-digital conversion is done in two steps, the first of which is based on coarse time quantization as measured by cycles of an oscillator and the second ...

In a Digital Pixel Sensor (DPS), each pixel has an ADC, all ADCs operate in parallel, and digital data is directly read out of the image sensor array as in a conventional digital memory [1]. The DPS architecture offers several advantages over analog image sensors including better scaling with CMOS technology due to reduced analog circuit performance demands and the elimination of column fixed-p...

This paper describes a technique for digital error correction in pipelined analog-digital converters. It makes use of a slow, high resolution ADC in conjunction with an LMS algorithm to perform error correction in the background during normal conversion. The algorithm will be shown to correct for errors due to capacitor ratio mismatch, finite amplifier gain and charge injection within the same ...

For the analog-to-digital conversion lab, we need a resetable ramp generator. Here, we explore building a ramp generator from a current source. We show two implementations that both use a PNP current source.