| 摘要 |
PURPOSE: A wireless communication transceiving device combining a transmission amplitude shift modulation with a reception frequency conversion by one mixer is provided to function as a transmission amplitude shift modulating device at transmission time, and to function as an IF conversion device on a reception path by using one mixer and a band pass filter, thereby simplifying a circuit structure. CONSTITUTION: A low pass filter(271) configuring a transceiving data separator(270) limits bands, and a mixer(211) functioning as an amplitude shift modulator mixes the bands with an local oscillating signal(200) to modulate the mixed signal. A band of the modulated signal is limited in a band pass filter(212), and is power-amplified in a high frequency amplifier(230) via a switch(220). The amplified signal passes through a switch(240), and is radiated to the air via an antenna(250). A high frequency signal is amplified in a low noise amplifier(260) according to a reception path obtained from the switch(240). An unnecessary portion of the amplified signal is removed in the band pass filter(212) via the switch(220). The mixer(211) converts the signal into an IF signal with the local oscillating signal(200). The signal passing through a filter(272) is re-amplified in an amplifier(281), and a desired channel signal only is filtered by an IF selection filter(282).
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