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This paper presents a design and measurements of multichannel integrated circuits dedicated to recording of neurobiological signals. 64 recording channels have been implemented in a single chip using a commercially available CMOS 180 nm process. A single recording amplifier consumes only 25 µW from 1.8 V supply and occupies 0.13 mm2 of the silicon area. Its main parameters such as the low/high cut...
A novel topology for a high speed voltage level shifter (VLS) is presented. It features a built-in short circuit current reduction which increases the speed and reduces the power consumption. Unlike the conventional VLSs, the proposed VLS does not need complex digital timing signals. The simplicity of its operation results into robustness of operation, high speed and low power. The VLS was designed...
This paper reports a new measurement based approach that can be used to determine the functional dependence of a D.C. circuit variable of interest on a small set of design variables. The approach makes use of a small number of measurements and generalizes the well known Thévenin's Theorem of circuit theory.
In this paper we present a novel topology of a class-AB flipped voltage follower (FVF) output stage. This stage has better slew-rate performance than the standard FVF buffer, and better linearity and output resistance than the standard class-AB stage. Besides, it achieves higher output voltage swing than other class-AB FVF buffers previously presented in the literature. It is thus suitable for low-voltage...
A CMOS voltage-to-current converter is presented. It is based on a class AB current mirror with very low input resistance and a passive resistor connected to the input for voltage-to-current conversion. Class AB operation is achieved without extra supply voltage requirements or static power consumption, using Quasi-Floating Gate techniques. Measurement results of a differential configuration for a...
Bioelectrical impedance measurements can be used in a wide range of clinical applications for monitoring and tissue characterization. Bioimpedance measurement applications need current drivers with high output impedance and stable current injection in the frequencies from DC to about 10 MHz. This paper presents an improved current driver based on a pair of balanced operational transconductance amplifiers...
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