Multiple Comparator Circuit

Abstract

The invention relates to the field of a semiconductor device and discloses a multi-way comparator circuit. The multi-way comparator circuit comprises an input selection circuit and a comparison output circuit, a management operating system (MOS) pipe is used to control selection of selection of a multi-way input signal. Meanwhile, the comparison output circuit is reused so as to achieve comparison for the multi-way input signal at low hardware price. The comparison output circuit manages a direct current channel through a gating current pipe, and is opened when the comparison output circuit is really required to be compared, so that power consumption of the comparison circuit is greatly reduced. In addition, MOS pipes of different breadth length ratios are selected as the MOS pipes that grid electrodes are connected with input signals or reference signals, or the MOS pipes of the same breadth length ratio are connected in parallel, and a pre-amplification function of the input signals or the reference signals is achieved. A MOS pipe M9 is increased in the comparison output circuit, so that output comparison signals are arranged on a stable level when the comparison circuit does not work so as to prepare for a next comparison.

Description

technical field [0001] The invention relates to the field of semiconductor devices, in particular to a comparator circuit. Background technique [0002] A comparator compares two or more input signals to determine whether they are equal, or to determine their magnitude relationship and order. Normally, a comparator compares an analog voltage signal with a reference voltage. The two inputs of the comparator are analog signals, and the output is a power or ground signal. When the difference between the input voltages increases or decreases, its The output remains constant. [0003] Comparator circuits have been widely used in digital-to-analog converters (Digital Analog Converter, referred to as "DAC"), analog-to-digital converters (AnalogDigital Converter, referred to as "ADC"), various instrument circuits, precision amplifiers, etc. For example, it usually contains dozens of comparator circuits, so realizing a comparator circuit that can complete multiple comparisons and h...

AI Technical Summary

Problems solved by technology

However, the inventors of the present invention have found that since this comparator is based on an operational amplifier, no matter whether the input signal needs to be compared, there is always a DC current path from the power supply to the ground, and the power consumption is relatively large

And this kind of comparator does not have the function of pre-amplification. If the input signal or reference signal is to be amplified and compared, other amplifying circuits must be added, which will undoubtedly increase the complexity and power consumption of the circuit.

Therefore, the multi-input comparator based on this operational amplifier structure has large power consumption and area, and the degree of circuit multiplexing is not high.

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