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    • 10. 发明申请
    • Variable Gain Amplifier
    • 可变增益放大器
    • US20080284517A1
    • 2008-11-20
    • US12130453
    • 2008-05-30
    • Thomas J. BardsleyMatthew R. Cordrey-GaleJames S. MasonPhilip J. MurfetGareth J. Nicholls
    • Thomas J. BardsleyMatthew R. Cordrey-GaleJames S. MasonPhilip J. MurfetGareth J. Nicholls
    • H03G3/10
    • H03F3/45475H03F1/0277H03F3/211H03F3/45179H03F3/72H03F2203/45138H03G1/0029H03G1/0088H03G3/001H03G2201/103H03G2201/504
    • A method of varying the gain of an amplifier and an amplifier array are provided. The amplifier array includes two or more amplifier stages (201, 202) connected in parallel with each amplifier stage having a gain control means. Input signal means (203, 204) are provided for each amplifier stage with the input signals of the amplifier stages being of different amplitude. Means for enabling and disabling an amplifier stage (216) are provided and means for summing the outputs of the enabled amplifier stages obtain an output signal (212). The gain of the amplifier array has a range from a low gain setting with a first amplifier stage (202) enabled, through increasing gain settings as the gain of the first amplifier stage is increased from a minimum to a maximum gain, a second amplifier stage (201) can then be enabled in addition to the first amplifier stage and the gain of the second amplifier stage increased from a minimum to a maximum gain, further amplifier stages are enabled as available up to a maximum gain setting for the amplifier array. Each amplifier stage that is enabled has a decreasingly attenuated input signal and a final amplifier stage to be enabled has a full input signal (203).
    • 提供了改变放大器和放大器阵列的增益的方法。 放大器阵列包括与具有增益控制装置的每个放大器级并联连接的两个或更多个放大器级(201,202)。 为每个放大器级提供输入信号装置(203,204),放大器级的输入信号具有不同的幅度。 提供了用于启用和禁用放大器级(216)的装置,用于对使能的放大器级的输出进行求和以获得输出信号(212)的装置。 放大器阵列的增益具有从具有第一放大级(202)使能的低增益设置的范围,通过当第一放大器级的增益从最小增益增加到最大增益时增加增益设置,第二放大器级 (201)除了第一放大器级以及第二放大器级的增益从最小增益增加到最大增益之外,还可以使能另外的放大器级,直至达到放大器阵列的最大增益设置。 启用的每个放大器级具有递减衰减的输入信号,并且待使能的最终放大器级具有完整输入信号(203)。