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    • 9. 发明授权
    • Analog switch circuit and signal attenuator employing an analog switch
circuit
    • 采用模拟开关电路的模拟开关电路和信号衰减器
    • US4611135A
    • 1986-09-09
    • US531178
    • 1983-09-09
    • Yoshio NakayamaFuminori AbeNaofumi Nagasawa
    • Yoshio NakayamaFuminori AbeNaofumi Nagasawa
    • H03G3/02H03K17/16H03K17/687
    • H03K17/164
    • An analog switch circuit comprises a first transfer gate (20) and a second transfer gate (23). The first transfer gate comprise first P-type and N-type field-effect transistors (21) and (22) having first electrodes thereof commonly connected through an output terminal (5) to a load (6) and second electrodes thereof commonly connected through an input terminal (4) to an input signal source (7) of an impedance lower than that of the load. The second transfer gate comprises second P-type and N-type field-effect transistors (24) and (25) of a gate size smaller than that of the respective transistors constituting the first transfer gate having the first and second electrodes connected in parallel with the first and second electrodes of the first P-type and N-type transistors, respectively. The second transfer gate is first turned on and then the first transfer gate is turned on, whereby a switching noise on the occasion of turning on of the first transfer gate is bypassed through the second transfer gate to the input signal source.
    • 模拟开关电路包括第一传输门(20)和第二传输门(23)。 第一传输门包括第一P型和N型场效应晶体管(21)和(22),其第一电极通过输出端子(5)共同连接到负载(6),第二电极通过第二电极 输入端子(4)输入到低于负载的阻抗的输入信号源(7)。 第二传输门包括第二P型和N型场效应晶体管(24)和(25),其栅极尺寸小于构成第一传输门的各个晶体管的栅极尺寸,其具有与第一和第二电极并联连接的第一和第二电极 第一P型和N型晶体管的第一和第二电极。 第二传输门首先导通,然后第一传输门被导通,由此在第一传输门的导通时,开关噪声通过第二传输门被旁路到输入信号源。