Input interface integrated circuit and input interface circuit thereof

Abstract

The invention provides an input interface circuit. The input end of the input interface circuit is grounded through a stray capacitor, and is connected with a drain electrode of a first MOS tube through a first resistor; a source electrode of the first MOS tube is grounded or connected with a power supply; a grid electrode of the first MOS tube is connected with the output end of the input interface circuit through a second phase inverter; the input end of the input interface circuit is also connected with the output end of the input interface circuit through a second resistor, a first phase inverter and the second phase inverter sequentially. The input interface circuit receives an input signal through the first resistor and the second resistor, the signal passes through the second resistor and is sent to the first phase inverter for phase inversion, and the phase-inverted signal is sent to the input end of the second phase inverter for phase inversion once more, so that the polarity of an output signal is the same as that of the input signal; the input interface circuit starts from the input end of the second phase inverter and feeds back to the grid electrode of the first transistor, and the source electrode of the first transistor is connected with the input end of the input interface circuit through the first resistor so as to form a large positive feedback loop; the positive feedback loop achieves input port characteristics of self bias and zero power consumption.

Description

technical field [0001] This application relates to the technical field of CMOS integrated circuit design, in particular to an input interface integrated circuit and its input interface circuit. Background technique [0002] In the integrated circuit, the external signal of the digital mode is composed of high level and low level, and the intermediate level is used as the transition of high and low levels, which does not contain any meaningful information. Such signals need to enter the integrated circuit through the digital input port. the interior of the circuit. When the core circuit of the integrated circuit is powered on, each external input of the core circuit requires a clear level positioning, otherwise the input is not the fixed level required by the digital signal, but may be between high and low levels any value. For CMOS logic gates, when the input signal is in an indeterminate state, the N-type and P-type transistors in the logic gate will be turned on at the s...

AI Technical Summary

Problems solved by technology

However, if the input port circuit has a fixed pull-up or pull-down resistor, the input signal will generate a voltage drop through this resistor, which will cause a current, which will increase the power consumption of the circuit. When multiple input ports in the system consume current , the power consumption of the whole system will rise. For consumer electronics and other power-sensitive applications, this excess power consumption is unacceptable

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