A direct conversion method is disclosed. The method comprises: amplifying the input signal to generate an amplified signal; down-converting the amplified signal into two intermediate signals using a first set of ternary signals and a second set of ternary signals, respectively; filtering the first intermediate signal to generate a third intermediate signal; filtering the second intermediate signal to generate a fourth intermediate signal; digitizing the third intermediate signal into a first output signal in accordance with a first clock; digitizing the fourth intermediate signal into a second output signal in accordance with the first clock; and generating the first set of ternary signals and the second set of ternary signals based on a second clock.