In the design of cascode CMOS low-noise amplifiers, the gate-drain capacitance is generally neglected because it is thought to be small enough compared to gate-source capacitance. However, a careful examination will reveal the fact that the drain impedance of the input transistor significantly affects the input impedance through the gate-drain capacitance, especially as the CMOS technology gett...

A new very high performance low voltage cascode current mirror (CM) circuit is proposed in this work. The CM utilizes the low supply voltage and low input resistance characteristics of a cascode CM. In this CM, cascode configuration is used to obtain a wide operating current range and resistance compensation technique is incorporated to increase the operating bandwidth. The peaking in frequency...

A B ST R A C T The ionizable groups and conductances of the rod plasma membrane were studied by measuring membrane potential and input impedance with micropipettes that were placed in the rod outer segments. Reduction of the pH from 8.0 to 6.8 or from 7.8 to 7.3 resulted in membrane depolarization in the dark (by 2-3 mV) and an increased size of the light response (also by 2-3 mV). The dark dep...

A B ST R A C T The ionizable groups and conductances of the rod plasma membrane were studied by measuring membrane potential and input impedance with micropipettes that were placed in the rod outer segments. Reduction of the pH from 8.0 to 6.8 or from 7.8 to 7.3 resulted in membrane depolarization in the dark (by 2-3 mV) and an increased size of the light response (also by 2-3 mV). The dark dep...

The bore profile and input impedance of a musical wind instrument provide valuable information about its acoustical properties. The time domain technique of acoustic pulse reflectometry can be used to measure the input impulse response of a tubular object, such as a wind instrument, from which both its bore profile and input impedance can be calculated. In this thesis, after a discussion of the...

The universal attributes of piezoelectric transformers (PT) were derived by an approximate analysis that yielded closed form equations relating the normalized load resistance to the voltage gain, output power per unit drive and efficiency. It is suggested that the closed form formulas developed in this study could be invaluable when studying, specifying and designing practical PTs applications.

Steriade, M., I. Timofeev, and F. Grenier. Natural waking and sleep states: a view from inside neocortical neurons. J Neurophysiol 85: 1969–1985, 2001. In this first intracellular study of neocortical activities during waking and sleep states, we hypothesized that synaptic activities during natural states of vigilance have a decisive impact on the observed electrophysiological properties of neu...

C Cl li in ni ic ca al l s si ig gn ni if fi ic ca an nc ce e o of f p pu ul lm mo on na ar ry y a ar rt te er ri ia al l i in np pu ut t i im mp pe ed da an nc ce e Pulmonary arterial input impedance excites the attention of few clinicians, but there are compelling reasons why they should be more interested in this subject. Physicians are well-versed in the intricacies of pulmonary vascular re...

The input impedance of the systemic circulation was calculated from recordings of pulsatile pressure and flow in the ascending aorta of 20 patients. Ten patients had clinical and hemodynamic evidence of heart failure. The other 10 subjects had no clinical evidence of heart failure and were used as a control group. In the heart failure patients, both input resistance and characteristic impedance...

We derive an expression for the input complex impedance of a Sallen-Key second-order low-pass filter of unity gain as a function of the natural frequency , o  quality factor Q and the ratio of the resistors of the filter. From this expression, it is shown that the filter behaves like a single capacitor for low frequencies and as a single resistor at high frequencies. Furthermore, the minimum i...