Reactance adjustment device, transceiver and transmission device using the same, signal processing circuit suitable for them, reactance adjustment method, transmission method, and reception method

摘要

The present invention relates to an integrator comprising a first switching means, one end of which is connected to a voltage source (Vdd) outputting a predetermined voltage. Also, the integrator comprises a second switching means (SW2), which is connected at one end to the first switching means (SW1) and the other end with a negative electrode of the voltage source (Vdd). A first comparison means (211) compares a predetermined first threshold voltage (V1) and an input voltage for output of a signal to turn on the first switching means (SW1), when the input voltage is lower than the first threshold voltage (V1). A second comparison means (212), compares an input voltage and a second threshold voltage (V1), higher than the first threshold voltage (V1) for output of a signal to turn on the second switching means (SW2) when the input voltage is higher than the second threshold voltage (V2). A capacitor (213) of the integrator has one end connected to the other end of the first switching means (SW1). A signal appearing on the other end of the first switching means (SW1) is output as an output signal of the integrator. Thereby, when neither the first switching means (SW1) nor the second switching means (SW2) is turned on, no large current flows from the voltage source (Vdd) to earth ground, thereby preventing a power consumption from increasing.