How to add variable DC offset to AC signal?
Suppose you start with bipolar DC supplies, +330V -330V, to power a half-bridge. Then raise or lower bias voltages to obtain desired AC output at the load. (The bias signal needs to sink and source 12 W peaks.) By placing NPN at top, it avoids shoot-through and power loss. Positive output matches (follows) bias voltage to the NPN.
How to add an offset to an analog signal?
Electrolytic won’t work well. With R1 set to midpoint, you should have about a 2.25v offset. If you need to go much lower than that, disconnect R1 from the ground, and add another 100k resistor from Vee to the lower side of R1. Make sense? Bill beat me to it “Variations on the same theme…” The mouse is quicker than the keyboard!
How does adding DC offset to a given input work?
It adds an offset equal to the voltage on the non inverting input (+), and adds some gain equal to -Rf/Rin, where Rf is the top resistor. This is also an alternative way, but you’re gonna lose some amplitude because the arrangement creates a low pass filter.
What should the offset be on a Vee circuit?
With R1 set to midpoint, you should have about a 2.25v offset. If you need to go much lower than that, disconnect R1 from the ground, and add another 100k resistor from Vee to the lower side of R1.
What is the DC offset of a sensor?
The sensor has a nominal DC offset of 2V and when pressure is applied, the output changes (AC signal with 0.1Hz) on top of 2V DC offset. Ideally, a differential amp would have worked perfect, if my DC offset doesn’t change because of small variations on the sensor reference port (sensor is differential). You are correct in the second statement.
What is the DC frequency of a 2.0V AC signal?
So there is a 2.0V DC offset and +/-0.2V if the AC signal on top of the 2.0VDC offset, the signal frequency is 0.1Hz (I have attached a picuture (originalsignal.png)).
How to create DC offset for a generator?
The usual way to create a DC offset for a function generator would be an op amp acting as a differential amplifier, in the normal 4 resistor 1 op amp style, the function generator output would be the inputs to the differential amp with 1 small change