| 摘要 |
A mixer using an attenuator is disclosed. The mixer comprises a first signal selection unit(70) for receiving a first, a second, a third and a fourth control signals applied from an external and for selecting one signal to provide the selected control signal; a first attenuating unit(82) for latching a first input information according to a first clock signal, attenuating the latched signal according to the first control signal, and outputting the attenuated signal according to a second clock signal, and for latching a second input information according to a first clock signal, attenuating the latched signal according to the second control signal, and outputting the attenuated signal according to a second clock signal; a second attenuating unit(84) for latching a first input information according to a first clock signal, attenuating the latched signal according to the third control signal, and outputting the attenuated signal according to a third clock signal, and for latching a second input information according to a first clock signal, attenuating the latched signal according to the fourth control signal, and outputting the attenuated signal according to a third clock signal; a first mixing unit(100) for mixing the outputs from the first attenuating unit in responsive to the frist and the second control signals; a second mixing unit(110) for mixing the outputs form the second attenuating unit in responsive to the third and the fourth control signals; and a second signal selection unit(120) for selectively outputting the outputs from the first and the second mixing units.
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