With continuing progress in VLSI and ASIC technologies, digital signal processing (DSP) algorithms have continued to find great use in increasingly wide application areas. DSP has gained popularity also in embedded systems although these systems set challenging constraints for implementations. Embedded systems contain limited resources, thus embedded DSP systems must balance tradeoffs between t...

An Analog VLSI Chip with Asynchronous Interface for Auditory Feature Extraction Nagendra Kumar, Wolfgang Himmelbauer, Gert Cauwenberghs, Andreas G. Andreou Center for Language and Speech Processing Johns Hopkins University, Baltimore MD 21218, USA. Abstract|We describe the architecture and circuit implementation of an analog VLSI feature extraction chip that has an asynchronous digital interfac...

This paper presents a fully-integrated RF transceiver operating from 860 to 930 MHz. The device parameters are compliant to the IEEE 802.15.4 standard. The analog portion of the chip contains a direct-conversion receiver, a fractional-N PLL, a direct-conversion transmitter and a TR-switch. Digital baseband signal processing as well as MAC support are also implemented on the same chip. Only mini...

Signals can be divided into three categories: continuous-time (analog) signals, discrete-time signals, and digital signals. The signals that we encounter daily are mostly analog signals. These signals are defined continuously in time, have an infinite range of amplitude values, and can be processed using analog electronics containing both active and passive circuit elements. Discrete-time signa...

(b) There are several ways to construct linear-phase FIR filters, including windowing the IDTFT of an ideal response, but in order to ensure a minimax-optimal filter (i.e., a filter that minimizes the maximum deviation from a piecewise-constant ideal specification), the way we know is via the Parks-McClellan approach. In fact. this filter was designed in Matlab as: >> h = firpm(8, [0 0.55 0.65 ...