双模信号收发设备包含第一发射电路、第二发射电路以及接收电路。第一发射电路操作于第一模式，并根据第一振荡信号处理第一输入信号，以输出第一输出信号。第二发射电路操作于第二模式，并根据第二振荡信号处理第二输入信号，以输出第二输出信号。第二振荡信号的频率不为第一振荡信号的频率的整数倍。接收电路根据第一振荡信号处理关联于第一模式与第二模式中之一者的外部信号，以读取关联于外部信号的数据。

A dual-mode signal transceiver includes a first transmitter circuit, a second transmitter circuit, and a receiver circuit. The first transmitter circuit operates in a first mode, and processes a first input signal according to a first oscillating signal to output a first output signal. The second transmitter circuit operates in a second mode, and processes a second input signal according to a second oscillating signal to output a second output signal. A frequency of the second oscillating signal is not an integral multiple of a frequency of the first oscillating signal. The receiver circuit processes an external signal that is associated with one of the first mode and the second mode, in order to access data associated with the external signal.