Current mirror circuit
A current mirror and circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of increased static power consumption, limited output swing of the current mirror circuit, etc., and achieve the effect of improving the accuracy of the current mirror
Active Publication Date: 2019-02-22
58TH RES INST OF CETC
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Problems solved by technology
[0004] In order to solve the problems of limited output swing and increased static power consumption of the current mirror circuit caused by increasing the output impedance of the current mirror by adopting techniques such as cascode or gain improvement in the related art to improve its mirror image accuracy, the present invention implements example provides a current mirror circuit
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[0028] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.
[0029] Please refer to figure 1 , figure 1 A schematic circuit connection diagram of a current mirror circuit 100 commonly used in the prior art is shown. like figure 1 As shown, the current mirror circuit 100 includes an input current source I 0 , NMOS tube MN4, NMOS tube MN5, PMOS tube MP6 and PMOS tube MP7.
[0030] For such as figure 1 As shown in the current mirror circuit 100, consid...
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The invention discloses a current mirror circuit, and belongs to the field of integrated circuits. The current mirror circuit adopts a first PMOS transistor MP1, a second PMOS transistor MP2, a thirdPMOS transistor MP3 and a fourth PMOS transistor MP4 to form a current mirror clamping circuit 300, and combines a matched resistor R1 and a matched resistor R2 to eliminate the error caused by a channel length modulation effect in a mirror MN1 current (namely, an input current I1) of the second PMOS transistor MP2 and third PMOS transistor MP3 and improve the precision of a current mirror. The current mirror circuit solves the problems that the output swing of the current mirror circuit is limited and the static power consumption is increased due to the fact that output impedance of the current mirror is increased by adopting a cascode or gain boosting or other technologies to improve the imaging precision of the current mirror in related technologies, and achieve the effect of improvingthe precision of the current mirror of the current mirror circuit.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a current mirror circuit. Background technique [0002] In the design of integrated circuits, the current mirror circuit is a very important basic unit, which usually exists in the whole chip as a bias or signal processing sub-module. [0003] The output impedance of the traditional current mirror circuit is small, and technicians consider the channel length modulation effect. The mirror current accuracy of the current mirror circuit is greatly affected by the output voltage. Usually, cascode or gain improvement technologies are used to increase the output of the current mirror. impedance to improve its mirroring accuracy. However, both solutions suffer from limited output swing of the current mirror circuit and increased static power consumption. Contents of the invention [0004] In order to solve the problems of limited output swing and increased static power consumption...
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Login to View More IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 奚冬杰罗永波宣志斌肖培磊
Owner 58TH RES INST OF CETC