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    • 4. 发明专利
    • Signal amplifier
    • 信号放大器
    • JP2011015077A
    • 2011-01-20
    • JP2009156193
    • 2009-06-30
    • Toshiba Corp株式会社東芝
    • KOBAYASHI HIROYUKI
    • H03G3/10
    • H03F3/45475H03F3/195H03F3/45179H03F2200/451H03F2203/45134H03F2203/45302H03F2203/45366H03F2203/45394H03F2203/45396
    • PROBLEM TO BE SOLVED: To provide a signal amplifier capable of holding the linearity of an output amplitude to an amplitude control word over a long term.SOLUTION: A selection circuit 4 selects a value 1 or a value -1 by Select applied to an input terminal 7 in an arbitrary operation interval. When a 2N-bit ACW (Amplitude Control Word) showing a value (N+n) or a value (N-n) is applied from an adder 6, a matching circuit 3 applies a complementary 2N-bit ACW showing the value (N+n) and the value (N-n), or a complementary 2N-bit ACW showing the value (N-n) and the value (N+n) to 2N control ports 13a and 13b of a DPA (Digitally Controlled Power Amplifier) 2a. The DPA 2a can equalize average values of total numbers of MOS transistors in which an on-operation is performed at an in-phase side and an opposite phase side, and can prevent the deterioration of a characteristic (collapse of linearity) caused by an secular change.
    • 要解决的问题:提供一种能够长期保持幅度控制字的输出幅度的线性度的信号放大器。解决方案:选择电路4通过选择应用于输入端选择值1或值-1 终端7在任意操作间隔中。 当从加法器6施加表示值(N + n)或值(Nn)的2N位ACW(幅度控制字)时,匹配电路3施加互补的2N位ACW,表示值(N + n 或数值(Nn),或表示DPA(数字控制功率放大器)2a的2N(N + n)值到N 2N个控制端口13a和13b的互补2N位ACW。 DPA 2a可以使在同相侧和相反相侧进行接通动作的MOS晶体管的总数的平均值相等,并且可以防止由世俗化引起的特性(线性的崩溃)的劣化 更改。