| ??? 05/02/05 20:50 Read: times |
#92759 - Track the drift Responding to: ???'s previous message |
Prahlad J. Purohit said:
What are these components that track each others drift. I couldnt get exactly what you mean. Please elaborate a bit more on this. Prahlad Purohit Think, as an example, of resistors in a Wheatstone bridge. You'll like all of them have *the same* temperature coefficient and be at the same temperature all the time so the changes in temp get cancelled in the final result. Analyze the bridge with Rx(1+DeltaTempx) with a different DeltaTempx for each resistor (x=1..4) so you can get a general equation, and then make all DeltaTempx equal. You'll get the DeltaTemp cancelled which means the circuit behavior doesn't depend on temperature. Another example: in circuits with transistors, the base-emitter junction always has a TempCo of (approx.) -0.6mV/degree. This property can be useful to measure temp, but in another applications could led to big drifts. So you can employ another transistor as P-N diode, best if gotten from the same batch, and change the resistor polarizing network to countermeasure the tempco of your main transistor. I don't know it I made it clear... Regards. Enrique. |
| Topic | Author | Date |
| WEOT: Signal Conditioning the right way. | 01/01/70 00:00 | |
| Calibration | 01/01/70 00:00 | |
| Re: Caliberation. | 01/01/70 00:00 | |
| Assumptions wrong. | 01/01/70 00:00 | |
| Re: Wrong Assumption. | 01/01/70 00:00 | |
| Tracking the offset. | 01/01/70 00:00 | |
| re:drift | 01/01/70 00:00 | |
| Drift compentsation | 01/01/70 00:00 | |
| Track the drift | 01/01/70 00:00 | |
| another track | 01/01/70 00:00 | |
| Signal conditioniong | 01/01/70 00:00 | |
| Choosing precision parts is the remedy | 01/01/70 00:00 | |
| Re: Choosing precision parts. | 01/01/70 00:00 | |
| Ratio is important | 01/01/70 00:00 | |
| wikipedia for op-amp | 01/01/70 00:00 | |
power supply noise | 01/01/70 00:00 |