Source,sink, and bipolar versions can also be designed with a single op amp and some resistors (Figure 1). The Figure 1 Circuits A, B, and C are constant-current sinks offering different compromises among precision, dynamicimpedance, and compliance range. Circuit D is a bipolar current ...
OP AMP DISTORTION AND NOISE DEPENDENCE ON CIRCUIT CONFIGURATION All the op amp distortion specifications discussed in this tutorial are highly dependent on the op amp configuration (inverting or non-inverting), gain, power supply voltage, output voltage swing, output loading, and output frequency. ...
Q. What should I know about op-amp noise? A. First, we must note the distinction between noise generated in the op amp and its circuit components and interference, or unwanted signals and noise arriving as voltage or current at any of the amplifier’s terminals or induced in its associated...
Figure 5(b)shows how to connect the op-amp as a fixed-gain non-inverting amplifier. In this case, the voltage gain equals (R1+R2)/R2, and the input impedance approximates (Ao/A)Zin, where Zin is the open-loop input impedance of the op-amp. The above circuit can be made to funct...
Op-amp constant current source. This constant current principle can be adapted to a current loop which is controlled by the variable input voltage from a sensor. In Figure 6.22, a demonstration circuit (VSM project CLOOP2) is shown which will give an output change of 1.00 V for an input ...
Operational amplifier or Op Amp as they are generally called are linear DC amplifiers. An op amp is a three-terminal device, one called the inverting terminal, one non-inverting terminal and the other is called the output terminal. Below, you can see a p
Constant-current circuits: current sink (A); current sink (B); current sink (C); bipolar current (sink/source) circuit (D); and current source (E). The output of Circuit A is uncertain because of the op amp's quiescent current, which adds to the calculated output. (The 25µA ...
Essentially, if a constant voltage is applied to the circuit, it produces an output in the form of a ramp with a consistent slope. When the input voltage is positive, the op-amp's output undergoes a negative ramp. This action causes the inverting terminal to move negatively, thereby preserv...
control each MOSFET separately, avoiding the current imbalance due to threshold spread.Figure 2shows two such circuit blocks in parallel, but more can be added if needed. With the jumper J1 closed and J2 open the circuit operates in constant current mode, with the total load current given by...
When you design for electronics applications, such as sensor or amplifier bias supplies or special waveform generators, a controlled constant-current source or sink circuit can serve as a useful building block. These circuits exhibit high dynamic-output impedance and deliver relatively large currents wi...