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Nanovolt amplifier design

A technology of operational amplifiers and resistors, used in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., to solve problems such as measurement circuit offset and unremoved noise

Inactive Publication Date: 2014-12-17
KEITHLEY INSTRUMENTS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Because both measurements in this technique measure the input, the same as the figure 1 The noise of the gain stage shown is half that of the measured noise, however, since the attenuator offset is not removed, care must be taken to ensure that the attenuator offset is stable
Also, measurement circuit offsets and noise (such as ADCs) are not removed and must therefore be removed by other measurement methods

Method used

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  • Nanovolt amplifier design
  • Nanovolt amplifier design
  • Nanovolt amplifier design

Examples

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Embodiment Construction

[0029] Embodiments of the disclosed technology generally relate to circuits designed to enable rejection of both amplifier offset and attenuator offset when measuring an input signal in two stages. Such embodiments generally yield more reliable measurements than those provided by prior art circuits in use today.

[0030] image 3 is a circuit diagram 300 illustrating a first example of an amplifier design in a measurement setup according to a particular embodiment of the disclosed technology. consists of a single amplifier A and two circuits R 1 and R 2 In the example of , measurements are made using two phases: a positive phase, in which the switches 302-306 are shown; and a negative phase (not shown), in which the switches are switched.

[0031] Switches 302-306 enable the application to R 1 The input voltage across the inverts, and V OS and V T1 Not reversed. Putting the V from the two stages OUT Averaging the difference of the measurements yields a result in which...

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Abstract

The invention discloses a nanovolt amplifier design. The circuit can include operational amplifier having a first input, a second input, and an output, first and second resistors in series between the output of the op-amp and a ground, and multiple switches configurable to toggle the circuit between a positive phase and a negative phase.

Description

technical field [0001] This invention relates to nanovolt amplifier design. Background technique [0002] There are two known techniques in which nanovoltmeters can reduce amplifier offset drift. The first technique, commonly referred to as the nulling method and consists of figure 1 Diagram, including two-stage measurement: input measurement and circuit common measurement. The difference between the two measurements can be used to remove the offset of the amplifier A and attenuator, as well as the offset of the measurement circuit, such as an analog-to-digital converter (ADC). [0003] When switch 102 is in the first state, for example at Hi (as shown), the resulting voltage V OUT_1 is given by: [0004] . [0005] When switch 102 is in the second state, for example at Lo (not shown), the resulting voltage V OUT_2 is given by: [0006] . [0007] Therefore, the measured voltage V Meas It can be determined by the following formula: [0008] . [0009] The se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45G01R19/00G01R19/25
CPCH03F1/303H03F3/38H03F3/45475H03F3/45
Inventor W.C.格克
Owner KEITHLEY INSTRUMENTS INC