How to measure positive and negative 1.5V signals using a single power supply system?

bigbat

How to measure positive and negative 1.5V signals using a single power supply system? [Copy link]

How to measure the signal of positive and negative 1.5V using a single power supply system? If the signal changes quickly, it can be measured through coupling. But if it is a signal that changes slowly, how to convert the signal of positive and negative 1.5V into a signal greater than 0V? For example: 0-3V

maychang

Superimpose a 1.5V voltage on the input signal to make it a 0~3V signal, then measure it and subtract 1.5V from the measurement result.

bigbat

Using an adding circuit?

maychang

bigbat posted on 2019-7-25 17:17 Do you use an addition circuit?

If the signal source allows, you can directly superimpose a 1.5V voltage on the "cold end" of the signal source. However, most signal sources do not allow this, so you can only use an addition circuit.

伟林电源

Just give it a positive bias and pull it up, that is, find a way to turn negative charge into positive charge.