This paper presents a passive mixer combined with a 1st-order active low-pass filter implemented in a purely digital low-power 65 nm CMOS technology. The filter consists of a four-stage operational amplifier with two feed-forward paths for a 3 dB corner frequency of 4 MHz. The mixer offers a very low flicker noise corner frequency of 80 Hz for DVB-H application. A fabricated test chip with inte...

Application of acetylcholine and carbamylcholine to cultured cockroach neurones held under whole-cell voltage-clamp conditions evoked an inward current that was accompanied by an increase in current noise. Fluctuation analysis of the noise revealed the existence of two Lorentzian components in acetylcholine, of corner frequencies 10 ± 0-6 Hz and 116 ± 9 Hz, and one Lorentzian component in carba...

s short oral presentations: EFFECTS OF GLUTAMATE ANTAGONISTS ON GOLDFISH TEMPORAL TRANSFER PROPERTIES MEASURED WITH THE ERG C.Mora-Ferrer, C.Albrecht, B.Benkner, B.Lux, M.Gruber & K.Behrend, Inst. Zoologie III, Abt. Neurobiologie, Johannes Gutenberg Univ., 55099 Mainz, Germany Purpose: Synaptic transmission from photoreceptors to bipolar cells, from bipolar cells to ganglion cells, and from bip...

In congestive heart failure, renal blood flow is decreased and renal vascular resistance is increased in a setting of increased activity of both the sympathetic nervous and renin-angiotensin systems. The renal vasoconstrictor response to renal nerve stimulation is enhanced. This is associated with an abnormality in the low-pass filter function of the renal vasculature wherein higher frequencies...

Thumbnail-sized inertial measurement systems based on Micro Electro Mechanical Systems (MEMS) technology have been perceived as a breakthrough in the field of inertial navigation. However, even as micromechanical accelerometers have seen widespread commercialization, vibratory micromechanical gyroscopes have not enjoyed similar success. Previous approaches to high-performance micromechanical gy...

A family of capacitively coupled alternating current (AC) amplifiers featuring ultra-low (below 1 Hz) corner frequency is presented. This achieved by using high-gain devices which actively boost feedback resistance and thus reduce frequency. procedure often termed, though with a different purpose, as “bootstrapping.” The proposed architectures are very general admit several possible practical i...

The patch-clamp technique in conjunction with current noise analysis was employed to clarify the events underlying the regulation of the CFTR (cystic fibrosis transmembrane conductance regulator) during cAMP-dependent stimulation. 3T3 fibroblast cells expressing the CFTR were stimulated in cell-attached mode with forskolin. The number (N) of activated channels per patch ranged from 1 to approxi...