Open Science Research Excellence

E Farshidi

Publications

7

Publications

7
1273
Generalized Noise Analysis of Log Domain Static Translinear Circuits
Authors:
Abstract:

This paper presents a new general technique for analysis of noise in static log-domain translinear circuits. It is demonstrated that employing this technique, leads to a general, simple and routine method of the noise analysis. The circuit has been simulated by HSPICE. The simulation results are seen to conform to the theoretical analysis and shows benefits of the proposed circuit.

Keywords:
Noise analysis, log-domain, static, dynamic,translinear loop, companding.
6
5115
A new Configurable Decimation Filter using Pascal-s Triangle Theorem
Abstract:
This paper presents a new configurable decimation filter for sigma-delta modulators. The filter employs the Pascal-s triangle-s theorem for building the coefficients of non-recursive decimation filters. The filter can be connected to the back-end of various modulators with different output accuracy. In this work two methods are shown and then compared from area occupation viewpoint. First method uses the memory and the second one employs Pascal-s triangle-s method, aiming to reduce required gates. XILINX ISE v10 is used for implementation and confirmation the filter.
Keywords:
Decimation filter, sigma delta, Pascal's triangle'stheorem, memory
5
6452
A Continuous Time Sigma Delta Modulators Using CMOS Current Conveyors
Abstract:
In this paper, a alternative structure method for continuous time sigma delta modulator is presented. In this modulator for implementation of integrators in loop filter second generation current conveyors are employed. The modulator is designed in CMOS technology and features low power consumption (65db), and with 180khZ bandwidth. Simulation results confirm that this design is suitable for data converters.
Keywords:
Current Conveyor, continuous, sigma delta, MOS,modulator
4
7000
A New True RMS-to-DC Converter in CMOS Technology
Abstract:
This paper presents a new true RMS-to-DC converter circuit based on a square-root-domain squarer/divider. The circuit is designed by employing up-down translinear loop and using of MOSFET transistors that operate in strong inversion saturation region. The converter offer advantages of two-quadrant input current, low circuit complexity, low supply voltage (1.2V) and immunity from the body effect. The circuit has been simulated by HSPICE. The simulation results are seen to conform to the theoretical analysis and shows benefits of the proposed circuit.
Keywords:
Current-mode, squarer/divider, low-pass filter, converter, translinear loop, RMS-to-DC.
3
8434
A Current-mode Continuous-time Sigma-delta Modulator based on Translinear Loop Principle
Abstract:
In this paper, a new approach for design of a fully differential second order current mode continuous-time sigma-delta modulator is presented. For circuit implementation, square root domain (SRD) translinear loop based on floating-gate MOS transistors that operate in saturation region is employed. The modulator features, low supply voltage, low power consumption (8mW) and high dynamic range (55dB). Simulation results confirm that this design is suitable for data converters.
Keywords:
Sigma-delta, current-mode, translinear loop,geometric mean, squarer/divider.
2
10008
Micropower Fuzzy Linguistic-Hedges Circuit in Current-Mode Approach
Authors:
Abstract:

In this paper, based on a novel synthesis, a set of new simplified circuit design to implement the linguistic-hedge operations for adjusting the fuzzy membership function set is presented. The circuits work in current-mode and employ floating-gate MOS (FGMOS) transistors that operate in weak inversion region. Compared to the other proposed circuits, these circuits feature severe reduction of the elements number, low supply voltage (0.7V), low power consumption (<200nW), immunity from body effect and wide input dynamic range (>60dB). In this paper, a set of fuzzy linguistic hedge circuits, including absolutely, very, much more, more, plus minus, more or less and slightly, has been implemented in 0.18 mm CMOS process. Simulation results by Hspice confirm the validity of the proposed design technique and show high performance of the circuits.

Keywords:
Current-mode, Linguistic-Hedge, Fuzzy Logic, lowpower
1
10914
A New Approach to Design Low Power Continues-Time Sigma-Delta Modulators
Authors:
Abstract:

This paper presents the design of a low power second-order continuous-time sigma-delta modulator for low power applications. The loop filter of this modulator has been implemented based on the nonlinear transconductance-capacitor (Gm-C) by employing current-mode technique. The nonlinear transconductance uses floating gate MOS (FG-MOS) transistors that operate in weak inversion region. The proposed modulator features low power consumption (<80uW), low supply voltage (1V) and 62dB dynamic range. Simulation results by HSPICE confirm that it is very suitable for low power biomedical instrumentation designs.

Keywords:
Sigma-delta, modulator, Current-mode, Nonlinear Transconductance, FG-MOS.