Automatic digital zeroing circuit for integral circuit
A technology of integrating circuits and circuits, which is applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as slowly changing voltage output, and achieve the effect of improving the effect of zero stability
Active Publication Date: 2013-04-24
NAVAL UNIV OF ENG PLA
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Problems solved by technology
For an ideal amplifier, any time U 0 should be zero, but in actual situations, when the amplifier is not connected to any input, the output terminal often has a slowly changing voltage output, that is, temperature drift, or zero point drift
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[0018] Below in conjunction with accompanying drawing, the present invention will be described in further detail:
[0019] Such as figure 1 As shown, the present invention includes the zero-stabilized amplifier AD8639, and the operational amplifier has adopted chopping self-stabilizing technology, so that the zero drift of the amplifier itself is less than ±23uV. The output terminal of the amplifier is connected to the input terminal of the sampling circuit, and the output terminal of the sampling circuit is connected to the positive and negative input terminals of the single-chip microcomputer control circuit. The control end of the C8051F350 single-chip microcomputer chip is the P0 port connected to the control switch, the output port is the P1 port connected to the input end of the compensation circuit that realizes the compensation voltage by the current type D / A, and the output end of the compensation circuit is connected to the negative input end of the amplifier. The f...
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The invention relates to the automatic zeroing technology of an operational amplifier and particularly relates to an automatic digital zeroing circuit for an integral circuit. The automatic digital zeroing circuit comprises a zeroed amplifier, the output end of the amplifier is connected with the input end of a sampling circuit, the output end of the sampling circuit is connected with the input end of a single-chip microcomputer control circuit, the control end of the single-chip microcomputer control circuit is connected with a control switch, a first contact of the control switch is connected with an integrating capacitor, the other end of the integrating capacitor is connected with the output end of the amplifier, a second contact of the control switch is connected with the output end of the amplifier, and a third contact of the control switch is connected with a negative input end of the amplifier. The automatic digital zeroing circuit for the integral circuit effectively improves zeroing effect of the original manual zeroing technology. According to different test results, null drift of the amplifier can be reduced to below one / fifth of manual zeroing, and the automatic digital zeroing circuit for the integral circuit has no load influence on the output end of the amplifier during normal operation of the amplifier.
Description
technical field [0001] The invention relates to an automatic zero-stabilization technology of an operational amplifier, in particular to an automatic digital zero-stabilization circuit for an integral circuit. Background technique [0002] Taking the analog operational amplifier as an example, when there is no signal input at the input terminal of the amplifier, the output voltage U at the output terminal 0 That is, the zero-point drift voltage of the op amp at this temperature. For an ideal amplifier, any time U 0 should be zero, but in actual situations, when the amplifier is not connected to any input, the output terminal often has a slowly changing voltage output, that is, temperature drift, or zero point drift. [0003] The temperature drift is mainly caused by the influence of temperature on the triode. Changes in temperature will cause small and slow changes in the static operating point of the triode, and this change will be amplified step by step by the subsequen...
Claims
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IPC IPC(8): H03F1/30
Inventor 腾腾赵治华陶涛潘启军张向明唐健李毅胡安琪
Owner NAVAL UNIV OF ENG PLA