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Self-startup low voltage operating current mirror circuit

A low-voltage operation, current mirror technology, applied in the field of electronics, can solve difficult transistor m4, mismatch and other problems

Inactive Publication Date: 2007-12-05
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this structure V DS2 ≠V DS3 (where: V DSN Represents the drain-source voltage of transistor N, the same below), which introduces a huge mismatch
Moreover, if considering the lining bias benefits of transistors m2, m4, and m5, it is difficult to ensure that transistor m4 works in the saturation region

Method used

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  • Self-startup low voltage operating current mirror circuit
  • Self-startup low voltage operating current mirror circuit
  • Self-startup low voltage operating current mirror circuit

Examples

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Embodiment Construction

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 2 is a circuit diagram of a self-starting NMOS-input dual-output current mirror according to an embodiment of the present invention. The whole circuit consists of NMOS low voltage cascode branch 201, PMOS low voltage cascode branch 203, first bias voltage branch 204, second bias voltage branch 202, PMOS output current branch 205, NMOS output The current branch 206 is composed of enabling the NMOS transistor m3 and closing the NMOS transistor m4. The NMOS low-voltage cascode branch 201 is composed of transistors m1 and m2 connected in series; the PMOS low-voltage cascode branch 203 is composed of transistors m8, m9, m10, and m11 connected in series; the first bias voltage branch 204 It is composed of m12, m13, and m14 connected in series; the branch 202 of the second bias voltage is composed of m5, m6, and m7 in series; the PMOS output current branch 20...

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Abstract

The invention is a self-startup low-voltage operating current mirror circuit, for receiving an input current to generate an output current whose type is the same as the type of the input current and the other output current whose type is different from the type of the input current. And it is characterized in that: it comprises: a first low voltage common-source common-grid branch circuit, receiving input-side current; a second low voltage common-source common-grid branch circuit supplying bias voltage; a second bias voltage branch circuit supplying bias voltage to the second low voltage common-source common-grid branch circuit; a PMOS output current branch circuit supplying p-type output current; an NMOS output current branch circuit supplying n-type output current; a startup transistor starting the current mirror circuit; and a switch-off transistor to switch off the current mirror circuit.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a self-starting low-voltage operating current mirror circuit. Background technique [0002] Current mirrors have been widely used in analog circuits as bias units or load elements. The principle that the current mirror follows is: if the gate-source voltages of two identical MOS transistors are equal, then the channel currents should also be equal. In the design of bias circuits, the use of current mirror technology can achieve better performance, such as being insensitive to changes in power supply voltage and operating temperature; using current mirrors to design bias currents usually saves chip area than using resistors, especially when When the bias current is required to be small; as a load element, the current mirror can generate a large resistance, so as to obtain a high voltage gain. [0003] A simple current mirror can be implemented using only two MOS transistors....

Claims

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Application Information

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IPC IPC(8): H03F3/34H03F3/343G05F3/26
Inventor 郭书苞赵冰仇玉林叶青
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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