This work demonstrates how to create a metamaterial with a tunable bandwidth that utilizes a transistor as a variable linear resistor. Bandwidth Tuning in Transistor Embedded Metamaterials Using Variable Resistance "Silicon transistors are approaching their size limit," Moon Kim, a professor of materials...
In an aspect, a circuit can include drain and source terminals; a HEMT having a drain and a source, wherein the drain is coupled to the drain terminal; and a variable resistor having a first electrode and a second electrode. The first electrode can be coupled to the source of the HEMT...
voltage (e.g. from a battery or from an A.G.C. or pulse source) is supplied, the operation of the transistor as a bidirectional resistor being linearized by the application of an appropriate fraction of the voltage developed between source and drain electrodes to the gate electrode or ...
This is the region in which the FET acts as a variable resistor and obeys Ohm's law, that is, the I-V curves become less steep as the negative bias on the gate increases, indicating that the resistance of the channel increases. For example, for Vgs = 0 V, the slope of the curve ...
In this case, VGS will control the conductance of the channel or, in other words, the channel acts as a variable resistor. Thus, the conductance between source and drain (gDS) is dependent on both VGS and VDS. The gDS is obtained from this expression: (1.14)gDS=1rDS=kn(VGS−Vt−...
Metal-oxide semiconductor field-effect transistors, also known as MOSFETs, have greater importance and are the most useful type among all transistors. The MOSFET has four terminals: drain, source, gate, and body or substrate. A MOSFET is also a voltage controlled Transistor, but the main differe...
operation, is connected to the bases of transistors 1, 2 through diodes 13, 14, respectively, which are poled so that the variable resistance, i.e. transistor 16, is connected to the base of that transistor which is cut off during operation. Zener diodes 5, 6 act as switches in ...
The level (A) can be easily adjusted by a variable resistor 4. The pulse 2a is added to a modulation time adjusting circuit 5 and the width of the pulse 2-a is enlarged as shown in pulse 2-b. This pulse is reversed by an output circuit 6 and added to the luminance modulation ...
11. The invention as defined in claim 3 wherein each of said second and fourth time delay means comprises: resistor means and capacitor means connected in series between associated circuit input terminal and circuit ground; said capacitor means adapted to charge to a voltage from said input termi...
The HF gain-control circuit has the base bias of the two transistors in the differential amplifier changed by a control transistor such that the HF input voltage is rectified and passed via a resistor (connected via a variable capacitor and variable resistor to ground), impedance transformer, DC...