We describe a new method for determining component values and transistor dimensions for CMOS operational ampli ers (op-amps). We observe that a wide variety of design objectives and constraints have a special form, i.e., they are posynomial functions of the design variables. As a result the ampli er design problem can be expressed as a special form of optimization problem called geometric programming, for which very e cient global optimization methods have been developed. As a consequence we can e ciently determine globally optimal ampli er designs, or globally optimal trade-o s among competing performance measures such aspower, open-loop gain, and bandwidth. Our method therefore yields completely automated synthesis of (globally) optimal CMOS ampli ers, directly from speci cations. In this paper we apply this method to a speci c, widely used operational ampli er architecture, showing in detail how to formulate the design problem as a geometric program. We compute globally optimal trade-o curves relating performance measures such as power dissipation, unity-gain bandwidth, and open-loop gain. We show how the method can be used to synthesize robust designs, i.e., designs guaranteed to meet the speci cations for a

Academic Dissertation to be presented with the assent of

In this paper we present an analytical model for charge injection in MOS switches that is valid for all regions of operation. The model is general and can be applied for different load conditions. We analyze and develop two separate charge injection models for the different operating conditions. A simple continuos model that is valid for all conditions is then stitched together using appropriate functions. Simulation results from this model agrees well with previously published measurement results. The model is used to predict charge injection error and nonlinearity. 1. INTRODUCTION Sample-and-holds (SH) are important circuit components in most modern analog sample-data systems. In general, in many such systems the overall system accuracy is limited by the nonlinearity introduced by the input sample-and-hold circuit. One of the limiting mechanisms for fully differential circuits is the nonlinearity introduced by the SH charge injection error [1]. Therefore, adequate modeling of charge...

Reduction of the power dissipation associated with high speed sampling and quantization is a major problem in many applications, including portable video devices such as camcorders, personal communication devices such as wireless LAN transceivers,

In this thesis a new signal processing technique is presented. This technique exploits the use of pulses as the signalling mechanism. This Palmo 1 signalling method applied to signal processing is novel, combining the advantages of both digital and analogue techniques. Pulsed signals are robust, inherently low-power, easily regenerated, and easily distributed across and between chips. The Palmo cells used to perform analogue operations on the pulsed signals are compact, fast, simple and programmable.

Abstract − In the design of a source driver in an active matrix LCD, of primal importance is the issue of how to restrict the admissible allowance of the RPV (i.e. the ratio of the pixel voltage to the video voltage) of a pixel within a specified narrow range, which determines the transmitted luminance of the pixel. This constraint on the RPV is analyzed in terms of parameters associated with the sampling switch and the sampling pulse, and then by using a minimal number of these parameters a design scheme is described dedicatedly for the sampling switch. Experimental results show that an optimal sampling switch can be attained by the proposed scheme, which gives rise to a source driver with almost 50 % less power consumption than the one by manual design. speed of the source driver in each column, henceforth designated as column driver, is far greater then that of the gate driver in each row, henceforth referred to as row driver. This implies that the column driver acts a principal role to determine the RPV (Ratio of Pixel voltage to Video voltage) of each pixel. 1

Abstract — In the design of an active matrix LCD, the ratio of the pixel voltage to the video voltage, abbreviated to RPV, is an important metric of the performance, since the pixel voltage determines the transmitted luminance of the pixel. Hence, in the design of a source driver circuit for an LCD, of primal importance is the issue of how to restrict the admissible allowance of the RPV of a pixel within a specified narrow range. This constraint on the RPV is analyzed in terms of parameters associated with the sampling switch and the sampling pulse, and then by using a minimal number of these parameters, a design scheme is described dedicatedly for the sampling switch, which finds an optimal sampling switch size and an optimal sampling pulse waveform. Experimental results show that an optimal sampling switch attained by the proposed scheme gives rise to a source driver with almost 50 % less power consumption than the one by manual design. Index Terms — CAD tool, sampling switch, sampling pulse, column driver circuit, active matrix liquid crystal display

Abstract—This paper presents a multiresolution general-purpose high-speed machine vision sensor with on-chip image processing capabilities. The sensor comprises an innovative multiresolution sensing area, 1536 A/D converters, and a SIMD array of 1536 bit-serial processors with corresponding memory. The sensing area consists of an area part with 1536 512 pixels, and a line-scan part with a set of rows with 3072 pixels each. The SIMD processor array can deliver more than 100 GOPS sustained and the on-chip pixel-analysing rate can be as high as 4 Gpixels/s. The sensor is ideal for high-speed multisense imaging where, e.g., color, greyscale, internal material light scatter, and 3-D profiles are captured simultaneously. When running only 3-D laser triangulation, a data rate of more than 20 000 profiles/s can be achieved when delivering 1536 range values per profile with 8 bits of range resolution. Experimental results showing very good image characteristics and a good digital to analog noise isolation are presented. Index Terms—APS, CMOS image sensors, laser triangulation, machine vision, MAPP, multiresolution, multisense, smart vision sensors, 3-D.