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Comparator circuit for differential swing comparison and common-mode voltage comparison
Comparator circuit for differential swing comparison and common-mode voltage comparison
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机译:比较器电路,用于差分摆幅比较和共模电压比较
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摘要
A comparator circuit includes at least one transconductance stage that receives two test voltages and two reference voltages. The transconductance stage produces two test current that are proportional to the test voltages and two reference currents. A switching circuit that is coupled to the transconductance stage. The switching circuit has two output terminals that are coupled to a conventional comparator stage. The switching circuit can combine the test currents with the reference currents to realize a differential swing comparison mode and a common-mode comparison mode as required for testing differential signals. Moreover, by disabling appropriate output signals from the at least one transconductance stage, a single-ended comparison mode is realized. By using two identical transconductance amplifiers, the non-linearity of the transconductance stage is advantageously canceled out.
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