Method for raising constant-current source circuit performance

A constant current source and circuit technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of reduced efficiency of constant current source circuits, difficulties in post-stage analog/digital conversion, and impact on final layout performance, etc. , to reduce the possibility of error or damage, improve load utilization, and avoid errors
CN100432884CActive Publication Date: 2008-11-12SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
3 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
Publication Date
2008-11-12

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a method to improve the constant-current source circuit performance. The subtraction device is set between the reference supply and the operational amplifier. The result subtracted from the circuit current source Vcc and the reference supply is as the positive input end of the operational amplifier and the reference resistance is connected between the circuit current source Vcc and the negative input end of the operational amplifier which the output end is connected to the base of the NPN triode and the collector electrode is connected to the negative input of the operational amplifier, the charge is connected between the emitter of the triode and the current source ground. The zero potential is the reference point for the voltage of the charge to decrease the dependence of the constant-current source circuit to the current source, so it can improve the loading and anti-interference performance of the circuit.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a constant current source circuit and relates to a method for improving the performance of the constant current source circuit. Background technique

[0002] Currently, if figure 1 The constant current source circuit of the shown principle has been widely used, and its detailed description can be found in Figure 17 in National Semiconductor Application Note20 "An Applications Guide for Op Amps". From figure 1 It can be clearly seen that the load voltage is based on the power supply Vcc as the reference terminal, and the voltage of the general power supply is above +12VDC, which brings great difficulties to the analog / digital conversion of the subsequent stage.

[0003] Under normal circumstances, the absolute voltage value of the analog input terminal of most A / D conversion devices is between +5V and +10V. If adding differential devices or other level shifting processing methods are used, on the one hand, it will bring errors...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More