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1. 发明授权

US06930554B2 Variable gain low noise amplifier and method 有权
标题翻译：可变增益低噪声放大器及方法
公开(公告)号：US06930554B2
公开(公告)日：2005-08-16
申请号：US10623047
申请日：2003-07-18
申请人： Jyoti Mondal , Neil L. Calanca , Matthew R. Miller
发明人： Jyoti Mondal , Neil L. Calanca , Matthew R. Miller
IPC分类号： H03F1/22 , H03F3/45 , H03G3/30 , H03G3/10
CPC分类号： H03F1/223 , H03F1/22 , H03F3/45089 , H03F2200/294 , H03F2200/372 , H03F2200/411 , H03F2203/45481 , H03G3/3052 , H03G3/3057
摘要： A variable gain control amplifier (10) and method provides a substantially constant input impedance and output impedance, and provides a substantially constant noise figure and third order harmonic. The variable gain control amplifier (10) includes an amplifier stage including at least a first intermediate fixed gain stage (22) operative to produce a first intermediate signal (30) in response to the input signal (20). The variable gain control amplifier (10) further includes at least a second intermediate fixed gain stage (24) operative to produce an output signal (18) in response to the first intermediate signal (30). A feedback circuit (16) is operative to produce a gain control signal (32) in response to the output signal (18). A gain control circuit (26) is coupled to the at least first intermediate fixed gain stage (22) and the second intermediate fixed gain stage (24), and receives the gain control signal (32) to control an amplitude of the intermediate signal (30).
摘要翻译：可变增益控制放大器（10）和方法提供基本恒定的输入阻抗和输出阻抗，并且提供基本上恒定的噪声系数和三阶谐波。可变增益控制放大器（10）包括放大器级，至少包括第一中间固定增益级（22），用于响应输入信号（20）产生第一中间信号（30）。可变增益控制放大器（10）还包括至少第二中间固定增益级（24），其响应于第一中间信号（30）而产生输出信号（18）。反馈电路（16）用于响应于输出信号（18）产生增益控制信号（32）。增益控制电路（26）耦合到至少第一中间固定增益级（22）和第二中间固定增益级（24），并且接收增益控制信号（32）以控制中间信号 30）。

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