Impedance calibration circuit and method

Abstract

In use for correcting equivalent impedance of a semiconductor element, the disclosed correcting circuit includes following parts: containing a reference element and a first element, the reference circuit is in use for receiving a testing signal and outputting a first signal; connected to the semiconductor element, a second element and the semiconductor element constitute a testing circuit, which is in use for receiving the testing signal, and outputting a second signal; connected to the reference circuit and the testing circuit, a control circuit is in use for comparing the first signal with the second signal in order to correct equivalent impedance of the semiconductor element.

Description

Technical field [0001] The present invention relates to the impedance correction of semiconductor elements, and in particular refers to an impedance correction circuit and method for correcting the equivalent impedance of a semiconductor element. Background technique [0002] Resistor is the basic element most commonly used in various circuits. In general circuits, there are many different types of electrical groups for designers to choose from, but in integrated circuits (IC), setting resistors usually consumes too much integrated circuit area, so generally speaking, they will try to use The characteristics of the source element replace the real resistance, and the active element is used to provide the equivalent impedance required by the circuit. [0003] However, the characteristics of active components are not only affected by process variations, but also changes in environmental parameters often cause significant changes in the characteristics of active components. For examp...

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Problems solved by technology

[0003] However, in addition to being affected by process variation, the characteristics of active components are often affected by changes in environmental parameters. For example, when the temperature changes, the active components can The value of the equivalent impedance provided will have a large change, which will inevitably affect the operation of the circuit to a certain extent, so the circuit designer must use a special circuit to properly adjust the equivalent impedance of the active components. Correction work

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