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Short pulse canel circuit

A technique for eliminating circuits and short pulses, used in pulse shaping, pulse description, etc.

Active Publication Date: 2006-12-20
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when A inputs a pulse H1 with a pulse width of 15ns, the pulse will charge the capacitor C after passing through the first inverter INV1, but V CP The voltage does not exceed the start voltage V of the second inverter INV2 TH

Method used

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Embodiment Construction

[0014] In view of the background of the invention, a simple low-pass circuit is not enough to filter the high-frequency noise from the signal transmitted from the I / O pad, because as long as two and / or more high-frequency noise signals are close enough, the It is enough to make the noise to be filtered pass through the input noise pulse due to the insufficient discharge of the capacitor. The circuit provided by the present invention can solve the above problems.

[0015] The circuit of the present invention can be figure 2 The functional block representation of the present invention includes: a signal conversion detection circuit 100, a control signal generation circuit 150, a reset and charging circuit 200, and a capacitor pulse detection and signal output circuit 250 connected in series in sequence. The signal conversion detection circuit 100 has an input terminal for receiving the input signal IN, and an output terminal 110. When the input signal IN changes, the output te...

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Abstract

A short pulse eliminating circuit includes a signal transform detection circuit for detecting the digit transformation of a first input signal, a detection pulse is generated when digit transformation appears in the input signals, a control signal generation circuit providing a first and a second control signals, a reset and charge circuit containing a p-transistor, a n-transistor and a condenser, among which n is parallel to the condenser connecting to the earth, p is overlapped above n and the two control signals control the charger and reset of the condenser and a capacitor pulse detection and signal output circuit connected to the output end of the charge and reset circuit, when they are reset and charged and time is over a set value, it responds the input signal to generate an output of a short pulse elimination signal.

Description

technical field [0001] The present invention relates to a circuit, in particular to a circuit which utilizes a signal detection circuit, a control signal generation circuit and a reset circuit to eliminate short pulses below a specific pulse width but allow input of signals exceeding a specific pulse width. Background technique [0002] An I / O pad is generally a bridge for an integrated circuit chip to communicate with other chips. Purely like a buffer, as in Figure 1a shown. A is the input signal terminal, and Z is the output terminal. When terminal A inputs a pulse, it is input to a buffer, such as an even number of inverters, and after a delay of several nanoseconds after the input, the output terminal Z should also output a pulse of the same width. [0003] If a low-pass component is added to allow the output / input pads to perform filter functions, functional errors may occur instead. See Figure 1b . A low-pass filter component is composed of two inverters and a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/01H03K5/125
Inventor 黄超圣
Owner VIA TECH INC