Benchmark Voltage Source Circuit of Zero Temperature Coefficient

Published:2011/7/26 0:01:00 Author:Michel | Keyword: Temperature Coefficient, Voltage Source Circuit | From:SeekIC

Picture a and b are the benchmark voltage source circuits of zero temperature coefficient.Zero temperature coefficient of benchmark voltage chooses the work point of field effect transistor according to zero temperature coefficient points of UGS-ID characteristic curve. It uses the voltage drop of both ends,which makes the constant current diode of zero temperature coefficient work.Operational amplifier A1 (LM4250) is the same phase work state and its work current is determined by R4.RP1 is used to set benchmark voltage temperature coefficient, it can be chosen between in positive,negative and zero.RP2 is used to adjust the voltage slightly.All the resistor in the circuit needs to choose metalfilmresistor with good temperature characteristic.Picture (b) is different from picture (a) and its A1 input end is connected with VT2 and there are two kinds of output voltgae.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Other_Circuit/Benchmark_Voltage_Source_Circuit_of_Zero_Temperature_Coefficient.html

Print this Page | Comments | Reading(3)