公开(公告)号：US06639447B2

公开(公告)日：2003-10-28

申请号：US10094324

申请日：2002-03-08

申请人： Tajinder Manku ,  Javad Khajehpour

发明人： Tajinder Manku ,  Javad Khajehpour

IPC分类号： G06F744

CPC分类号： H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D2200/0025 ,  H03D2200/0084 ,  H03D2200/0088

摘要： The invention is implemented in the form of modifications to a Gilbert mixer circuit. The modifications alleviate disadvantages and problems introduced because of low voltage power supply typically found in low-power devices such as portable cellular phones. In addition to improving the linearity performance, the new design also provides good matching between I and Q signals, and decreases the switching noise in the active mixer by reducing the switching current. The invention can be applied to both single stage and dual mixers to give low noise performance and Automatic Gain Control (AGC).

摘要翻译： 本发明以对Gilbert混频器电路的修改的形式实现。 这些修改减轻了由于低功率设备（例如便携式蜂窝电话）中典型地出现的低电压电源而引入的缺点和问题。 除了提高线性性能之外，新设计还提供了I和Q信号之间的良好匹配，并通过降低开关电流来降低有源混频器中的开关噪声。 本发明可以应用于单级和双重混频器，以提供低噪声性能和自动增益控制（AGC）。