Patent ID: 8761384
Filing Date: 2014-06-24
Classification: H03H,H04M

Abstract:
1. An impedance matching circuit, comprising a peripheral impedance detection module, an analog switch switching module and an impedance matching module that are connected in turn, wherein, the peripheral impedance detection module is set to: detect impedance of a subscriber telephone and output information about the impedance of the subscriber telephone; the analog switch switching module is set to: provide an impedance matching path between the impedance of the subscriber telephone and the impedance matching module according to the information about the impedance of the subscriber telephone output by the peripheral impedance detection module; the impedance matching module is set to: provide a corresponding impedance, through the impedance matching path provided by the analog switch switching module, to match said impedance of the subscriber telephone; wherein, the peripheral impedance detection module comprises an analog to digital conversion (ADC) detection module, and the ADC detection module is set to: output the information about the impedance of the subscriber telephone in the form of high or low level according to a value of the impedance of the subscriber telephone; said ADC detection module comprises a resistor R