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Recent evolutions in digital video processing and public image transmissions have led to a standard coding method. This method which is the discrete cosine transform has to meet the H261 standard requirements specified by the CCITT. For this purpose, we propose a dedicated processor for the 2 dimensionnal forward or inverse discrete cosine transform (FDCT or IDCT) for 8??8 block size. A double precision...
A 54MHz video restitution circuit fabricated in a high-performance 1.2um BiCMOS technology called HF3CMOS is described. The circuit receives two 8bit busses (Luminance Y and Chrominance CrCb signals) each at 27 Megasamples/second and provides on its outputs 3 analog signals either R,G and B or Y, Cr and Cb. Provision is also made for an analog multiplexing between the outputs of the internal DAC and...
A one chip 16??16 digital switch is presented, designed for use in a wide variety of applications, ranging from digital mobile radio and satellite applications, to PCM switching systems (ISDN). It provides a compact, low power solution to perform in channel controlled switching of 64 kbit/s or 2 Mbit/s channels. Architecture and design examples are discussed in detail.
A mixed Analog-Digital IC combining the speech and signalling functions for an analog telephone on a 2?? CMOS chip will be described. New features such as software programmable level control, dc characteristics, input impedance and transhybrid balancing offer a flexible system-solution for the different international requirements with a minimum number of external components. This features enable telephone...
A three channel micropower CMOS circuit for a programmable hearing aid is presented. It allows the compensation of even difficult hearing impairments by dividing the frequcency range in three channels and adjusting the dynamic losses separately. Thus, an individual hearing aid can be programmed. The circuit consists of two RC-active antialiasing filters, a multi-rate SC filter bank, several offset...
The circuits described in this paper are a line driver and a sensing amplifier. They are part of a Subscriber Line Interface Circuit (SLIC) fabricated in BCD technology that operates up to 100 V. The driver requires about 500 ??A of quiescent current, can sink and source up to 100 mA, and remains stable for all possible line lengths. The sensing amplifier senses the line current to synthesize both...
The paper deals with mixed-mode test pattern generator structures (deterministic and pseudo-random) using modified Linear Feedback Shift Register structures. The method allows a substantial decrease of the length of the pseudo-random test sequence with a slight increase of the silicon area. A CMOS design validates the method.
This paper describes a compact implementation of a three synapse Kohonen neuron with learning capability, using a standard CMOS technology. The synaptic weights are stored on a capacitor as a discrete voltage, input signals are frequency coded pulse streams and special pulse stream arithmetic is used to perform synaptic multiplication and learning.
Genesil was embedded into a VHDL environment in order to support early tradeoffs between ASICs, standard parts and software. A common front end is used to create RTL chip models in VHDL and to drive Genesil. The VHDL-Genesil interface supports use of multiple models with increasing detail and timing back-annotation. Examples are reported of automatically generated VHDL models.
A time-continuous programmable State-Variable filter is presented that has been realised using bipolar OTA's. A high input resistance and a good linearity is maintained irrespective of the programming of the transconductance using an OTA with a separated voltage-to-current input stage and a current-attenuation stage. A special common-mode loop is implemented to avoid the charging of the filter capacitors...
Line fed telecommunication circuits like battery operated circuits must work from very low supplies. Contrary to most battery operated systems in telecommunication applications, high performance is also required. This paper describes two low voltage (1.5 V minimum) Switched Capacitor (S.C.) filters that achieve a dynamic range comparable with that of filters operated from 5V or more. Both filters...
This paper presents a fully integrated MOSFET-C filter implemented in a BICMOS technology. The detrimental effect of excess noise upon the dynamic range is eliminated with no increase of thermal noise nor circuit complexity. Additionally, a novel, fully integrated, highly accurate and low ripple automatic tuning system is proposed.
A ??C-compatible analog front-end for ripple-control receivers is described. It serves to demodulate ripple-control signals transmitted by public electrical utilities over 50 Hz or 60 Hz power lines. Among others, it features a SC-bandpass filter with a programmable center frequency. The selectivity can be varied in the range between 9.52 and 28.57, while maintaining 80 dB rolloff and passband flatness...
In this paper the problem of generating on-chip two phase non-overlapping clocks for the Cathedral Silicon Compiler Environment is discussed. The problem is made harder by the introduction of robustness requirements, which means that the steady-state response of the generator has to be maintained regardless of power supply, temperature, process variations, noise and even harder, scaling and technology...
A novel concept is presented for the generation of truly random signals for analog/digital VLSI circuits. It is based on the analog implementation of very simple chaotic discrete-time systems. This concept is demonstrated via two monolithic Switched-Capacitor CMOS prototypes (respectively in a 2??m doublemetal single-poly technology and in a 3??m double-metal double-poly one). Both analog and digital...
In the recent years enormous progress has been made in integration of sensors and electronics on the same silicon substrate. So a strong demand for incorporated instrumentation amplifiers has arisen. In this paper we present a fully integrated CMOS version of such an amplifier using switched capacitor techniques. The amplifier system provides differential input capability, programmable amplification,...
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