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current comparator

A technology of current comparator and current mirror, which is applied in multiple input and output pulse circuits, etc., can solve problems such as circuit failure, and achieve the effects of low power consumption, high precision, and fast response speed

Active Publication Date: 2015-09-23
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the output node Vo of these two circuits is located at a PMOS pull-up transistor and an NMOS pull-down transistor. When a process change occurs, this change will cause a large voltage change at the bias voltage, and then very It is easy to cause the subsequent high-gain rail-to-rail amplifier to enter saturation or cut-off before the input current signal is added, so that the entire circuit cannot work normally

Method used

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] see Figure 4 , an embodiment of the present invention provides a current comparator 100, which includes a first current mirror 10, a second current mirror 20, a voltage dividing resistor 30, a first preamplifier 40, and a second preamplifier 50 cascaded in sequence. , the first high-increment inverter 60 and the second high-increment inverter 70 .

[0024] The first current mirror 10 includes a first NMOS transistor MN1 , a second NMOS transistor MN2 and a first PMOS transistor MP1 . The drain of the first NMOS transistor MN1 is connected to the gate and connected to the current Iin+, the gate is connected to the gate of the second NMOS transistor MN2, and the source is grounded to GND; the source of the second NMOS transistor MN2 The ground is GND, and the drain is connected to the source of the first PMOS transistor MP1; t...

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Abstract

The invention provides a current comparator. The current comparator successively comprises a first current mirror, a second current mirror, a partial pressure resistor, a first prepose amplifier, a second prepose amplifier, a first height increment reverser, and a second height increment reverser. The second current mirror is provided with a negative feedback resistor. The current comparator has the advantages of being simple in structure, lower in power consuming, faster in responding speed, and higher in accuracy and robustness.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a current comparator with low power consumption, high speed and high robustness. Background technique [0002] Due to its small area, high speed, low power consumption and other advantages, the current mode circuit has been paid more and more attention by people. A very important basic unit in the current circuit is the current comparator. The current comparator has been widely used in various linear and nonlinear integrated circuits, such as A / D converters (analog-to-digital converters), flip-flops, Voltage Controlled Oscillators, etc. [0003] At present, people have researched and developed a series of current comparators. D.A.Freitas and K.W.current ("CMOS current comparator circuit," Electronics Lett., vol.19, no.17, pp.695-697, 1983) proposed a relatively simple current comparator, which includes two cascade current mirrors , without a feedback resistor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/22
Inventor 姚爱萍张金勇王磊
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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