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Full scale input-output operational amplifier

An operational amplifier, input and output technology, applied in amplifiers, DC-coupled DC amplifiers, differential amplifiers, etc., can solve problems such as large noise, offset voltage, and gain reduction, and achieve the effect of reducing noise and input offset voltage

Active Publication Date: 2009-06-17
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the bias current sources Ib4 and Ib3 of the floating voltage source are connected in parallel with the active load of the input stage, the gain will be reduced to a certain extent, and a larger current source will also bring larger noise and offset voltage

Method used

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  • Full scale input-output operational amplifier
  • Full scale input-output operational amplifier
  • Full scale input-output operational amplifier

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Embodiment Construction

[0012] In order to make the common-mode input voltage of the operational amplifier with full-scale input and output reach full-scale, a parallel connection of PMOS and NMOS differential input pairs is used as the input stage, and the transconductance gm of the input stage will also change within the range of common-mode voltage variation. , in order to make frequency compensation simple, a constant gm is required. Depend on g m = β p I p + β n I n It can be seen that when the common-mode voltage is very high, the PMOS input pair will be cut off, and only the NMOS input pair will work at this time, so g m = β n I ...

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Abstract

The invention discloses an operational amplifier with full input and output, wherein the current of an input tube is controlled by current sources unsymmetrical up and down on the basis of an existing operational amplifier with full input and output, a source end of an NMOS differential pair is connected with the source electrode of a first switch transistor, the output end of a first current mirror and a first current source, and a source end of a PMOS differential pair is connected with the source electrode of a second switch transistor, the output end of a second current mirror and a second current source, the drain of the first switch transistor is connected with the input end of the second current mirror, the drain of the second switch transistor is connected with the input end of the current mirror, and the grid of a complementary differential pair of PMOS and NMOS is connected with input differential signals, wherein the first current source is equal to the second current source, and the first current source and the second current source are of 1:3 current mirrors. The operational amplifier with full input and output can keep the transconductance constant in the common mode input range.

Description

technical field [0001] The invention relates to an operational amplifier circuit, in particular to an operational amplifier with full scale input and output. Background technique [0002] The operational amplifier is an important module in the analog integrated circuit. As the characteristic size of the MOS transistor and the power supply voltage continue to decrease, for an operational amplifier, we not only hope that its input and output still have a large dynamic range, but also that the output The stage still has a strong driving ability. At this time, the rail-to-rail amplifier becomes particularly important. [0003] The block diagram of a typical rail-to-rail amplifier is shown in figure 1 shown, including complementary differential pair input stage, class AB output stage, transconductance g m control circuit and bias circuit. The usual rail-to-rail op amp adopts a two-stage structure, such as figure 2 As shown, in order to make the common-mode input voltage rea...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/26
CPCH03F3/45192
Inventor 郭璐朱红卫
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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