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    • 4. 发明授权
    • Audio power amplifier with automatic bias control
    • 具有自动偏置控制功能的音频功率放大器
    • US4077013A
    • 1978-02-28
    • US692781
    • 1976-06-04
    • Gene S. MorezJames F. Griffin
    • Gene S. MorezJames F. Griffin
    • H03F1/02H03F3/30H03F3/26
    • H03F1/0261H03F3/3091
    • A power amplifier with an automatic bias control circuit is disclosed. The amplifier includes two complementary Darlington pairs operating in a push-pull mode providing output power. A bias control network including a switching transistor is coupled to the base circuits of the Darlington pairs for controlling the bias current delivered to the pairs. The transistor is switched on and off by a detecting circuit which senses the presence of input signals applied to the amplifier. The bias control network operates to minimize power consumption by the Darlington pairs when no input signal is present and to raise the bias level of the Darlington pairs without distortion in the output signal when an input is applied to the amplifier.
    • 公开了一种具有自动偏置控制电路的功率放大器。 该放大器包括两个以提供输出功率的推挽模式工作的互补达林顿对。 包括开关晶体管的偏置控制网络耦合到达林顿对的基极电路,用于控制传输到对的偏置电流。 晶体管被检测电路接通和关断,该检测电路检测施加到放大器的输入信号的存在。 当没有输入信号时,偏置控制网络用于最小化达林顿对的功率消耗,并且当输入被施加到放大器时,在输出信号中提高达林顿对的偏置电平而不失真。