A Synchronous Comparator with Controllable Hysteresis

A comparator and hysteresis technology, applied in the field of synchronous comparators, can solve the problems of high system complexity, high power consumption, and system instability, and achieve the effect of reducing system complexity, simplifying the system, and avoiding the output being too sensitive.

Active Publication Date: 2016-09-21
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this kind of synchronous comparator does not contain hysteresis. If the amplitude of the signal to be compared is close to that in the control system, the output of the comparator will reverse at a high speed under the influence of noise, thus making the whole system in an unstable state.
Traditional methods such as adding digital filters and other means, the system complexity and power consumption will be very high

Method used

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  • A Synchronous Comparator with Controllable Hysteresis
  • A Synchronous Comparator with Controllable Hysteresis

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] A synchronous comparator with controllable hysteresis proposed in this embodiment includes a synchronous comparator module, a latch unit and a feedback module.

[0031] In the prior art, the structure of the synchronous comparator module and the latch unit is as follows figure 1 shown, where:

[0032] The structure of the synchronous comparator module is: the first transistor M 1 The gate of the transistor is connected to the bias voltage Φ, and the source is grounded; the second transistor M 2 The gate is connected to the input terminal Cp, and the source is connected to the first transistor M 1 The drain of the third transistor M 3 The gate is connected to the input terminal Cn, and the source is connected to the first transistor M 1 The drain of the fourth transistor M 4 source and the second transistor M...

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Abstract

The invention provides a hysteresis-controllable synchronous comparator which comprises a synchronous comparator module, a latch unit and feedback loops. The feedback loops are symmetrically arranged on two sides of the synchronous comparator module, the number of feedback modules is increased according to control requirements, and therefore hysteresis adjustment can be achieved. Compared with a traditional synchronous comparator, the hysteresis-controllable synchronous comparator has the advantages that at least one set of feedback loops is added, hysteresis digital control is achieved, output fluctuation caused by interference of input signals is effectively avoided, excessive output sensitivity is avoided, and the problem of poor stability of the traditional synchronous comparator is solved.

Description

technical field [0001] The invention belongs to the field of analog integrated circuits, in particular to a synchronous comparator with controllable hysteresis. Background technique [0002] Traditional synchronous comparators are widely used in control systems, and are mainly used in control systems for data control. Conventional synchronous comparators with output latches such as figure 1 shown, including synchronous comparator block and latch block. [0003] figure 1 The synchronous comparator shown is a basic synchronous comparator circuit with a latch function added. However, this kind of synchronous comparator does not contain hysteresis. If the amplitude of the signal to be compared is close to that in the control system, the output of the comparator will reverse at a high speed under the influence of noise, thus making the whole system in an unstable state. Traditional methods such as adding digital filters and other means, the system complexity and power consump...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/22
Inventor 袁玉湘卢慧慧姜学平于坤山
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY
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