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Comparator circuit and chip comprising same
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A comparator circuit, technology of comparison circuit, applied in the electronic field, can solve problems such as small input voltage range of comparator circuit
Pending Publication Date: 2021-03-16
SHANGHAI BEILING
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Abstract
Description
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to overcome the defect that the input voltage range of the comparator circuit is relatively small due to the connection of a transistor to the comparator circuit in the prior art, and to provide a comparator circuit and a chip containing it
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Embodiment 1
[0045] This embodiment provides a comparator circuit, such as figure 1 As shown, it includes a first amplifier circuit Amp1, a second amplifier circuit Amp2, a first comparison circuit Cmp1, a second comparison circuit Cmp2, a selection output circuit Mux and a selection signal generation circuit Gen;
[0046] The non-inverting input terminal of the first amplifying circuit Amp1 is connected to the first input voltage inp, the inverting input terminal of the first amplifying circuit Amp1 is connected to the second input voltage inn, and the non-inverting input terminal of the second amplifying circuit Amp2 is connected to the first input voltage inp, the inverting input terminal of the second amplifying circuit Amp2-connected to the second input voltage inn, the positive output terminal and the negative output terminal of the first amplifying circuit Amp1 are respectively connected to the first input terminal and the second input terminal of the first comparison circuit Cmp1 ,...
Embodiment 2
[0052] A comparator circuit provided in this embodiment is a further improvement on Embodiment 1, such as figure 2 As shown, the first amplifier circuit Amp1 includes: an eleventh NMOS transistor Mn11, a twelfth NMOS transistor Mn12, a thirteenth NMOS transistor Mn13, a fourteenth NMOS transistor Mn14, a fifteenth NMOS transistor Mn15, and a sixteenth NMOS transistor Mn16, seventeenth NMOS transistor Mn17, eighteenth NMOS transistor Mn18, nineteenth NMOS transistor Mn19, eleventh PMOS transistor Mp11, twelfth PMOS transistor Mp12, thirteenth PMOS transistor Mp13, fourteenth PMOS transistor Mp14 , the fifteenth PMOS transistor Mp15, the sixteenth PMOS transistor Mp16, the seventeenth PMOS transistor Mp17, and the eighteenth PMOS transistor Mp18.
[0053] The sources of the seventeenth NMOS transistor Mn17, the eighteenth NMOS transistor Mn18, and the nineteenth NMOS transistor Mn19 are all grounded to Vss, and the gates of the seventeenth NMOS transistor Mn17, the eighteenth N...
Embodiment 3
[0082] This embodiment provides a chip, which includes the comparator circuit in Embodiment 1 or Embodiment 2.
[0083] The comparator circuit is provided with a first amplifying circuit, a second amplifying circuit, a first comparing circuit, a second comparing circuit, a selection output circuit and a selection signal generating circuit, when the first input voltage and the second input voltage of the comparator circuit are less than a preset When the threshold voltage is set, the second amplifying circuit works normally, the selection signal generating circuit outputs the selection signal to the selection output circuit, and the second output result of the second comparison circuit is selected and output as the output result of the comparator circuit, when the first output result of the comparator circuit When the input voltage and the second input voltage are greater than the preset threshold voltage, the first amplifying circuit works normally, the selection signal generat...
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Abstract
The invention discloses a comparator circuit and a chip comprising the same. The comparator circuit comprises an in-phase input end of a first amplifying circuit and an in-phase input end of a secondamplifying circuit which receive a first input voltage, and an inverted input end of the first amplifying circuit and an inverted input end of the second amplifying circuit which receive a second input voltage. The first amplification circuit is used for outputting a corresponding first amplification signal and a corresponding second amplification signal to the first comparison circuit; the secondamplification circuit is used for outputting a corresponding third amplification signal and a corresponding fourth amplification signal to the second comparison circuit; the first comparison circuitis used for outputting a first comparison result to the selection output circuit; the second comparison circuit is used for outputting a second comparison result to the selection output circuit; the selection signal generation circuit is used for outputting a selection signal to the selection output circuit; the selection output circuit is used for selecting the first comparison result or the second comparison result as an output result of the comparator circuit. The input voltage range of the comparator circuit is expanded, and the circuit precision is improved.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a comparator circuit and a chip including the same. Background technique [0002] The comparator circuit is an important module of the integrated circuitsystem and is widely used in various integrated circuit systems. The input voltage of the existing comparator circuit is connected to a transistor, and the input voltage of the comparator circuit must be greater than the threshold voltage of the transistor. Threshold voltage, which cannot be compared for input voltages less than the threshold voltage of the transistor, resulting in a smaller input voltage range for the comparator circuit. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a comparator circuit and a chip including it in order to overcome the defect in the prior art that the comparator circuit is connected with a transistor, resulting in a relatively...
Claims
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Application Information
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