A portion farther on an inner circumference side than the spiral wire is used as a resistive element, and voltage for an input pad of the JFET is thereby divided to be taken out as a potential of the voltage division terminal wire.Taichi Karino...
It can be seen from the internal structure of the 55 circuit that this control terminal UC voltage is taken from the three voltage divider resistors R1 and R2, that is, taken from the non-inverting input of the comparator A1. The fixed voltage at the UC terminal is the reference voltage...
The gain element may be a pair of fixed resistors, a variable potentiometer, a tapped divider consisting of many resistors, or even a stepped attenuator. In practical circuits (i.e., those using nonideal amplifiers), offsets, noise, and many kinds of errors are amplified by the same factor...
A voltage variable resistance such as a junction-field-effect transistor (JFET) (13) is employed as part of a variable voltage divider for controlling the amplifier gain. Resistors (12,14) in series and in parallel with the JFET detemine minimum and maximum resistances corresponding to upper ...
A programmable, low-current voltage source for small-signal electronic equipment, such as portable cellular telephones, is achievable by generating and applying a bias voltage and a reference voltage across a voltage divider circuit. Consequently, a low-current output voltage is generated at the cente...
摘要：A voltage-controlled amplifier employs an operational amplifier (10) with negative feedback for setting the gain. A voltage variable resistance such as a junction-field-effect transistor (JFET) (13) is employed as part of a variable voltage divider for controlling the amplifier gain. ...
Sensing a negative voltage using the previously described method requires additional diodes and resistors on the output. Another trick for sensing a negative voltage that will have fewer additional components is to use a positive voltage to shift up the resistor-divider voltages so that the divided ...
The buffer amplifier after the voltage divider provides low impedance. However, the closed-loop output impedance (ROUT) of the amplifier is dependent on the frequency. At higher frequencies the output impedance increases for all amplifiers as the open-loop gain drops for the amplifier. Data sheets...
The output is connected, through a resistive divider, to a small−power SCR (MCR102 with IK(max) = 0.8 A). When the input voltage is detected to be above the trip point, the SCR is fired to shunt all the incoming current from the charge pump, and the triac will remain off. The...
Care must be taken that the divider formed by R3 and R4 biases the inputs somewhere within the specified IVR. If the amplifier’s supply voltage is not derived from VSY, and VCC comes up after VSY, the voltage at the inverting input of A1 will be: V– = VSY –(I–× R1...