专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06727746B2 Radio frequency amplifier and television tuner 失效
标题翻译：射频放大器和电视调谐器
公开(公告)号：US06727746B2
公开(公告)日：2004-04-27
申请号：US10225790
申请日：2002-08-22
申请人： Arshad Madni , Franco Lauria , Mark Stephen John Mudd , Lance Rhys Trodd , Nicholas Paul Cowley
发明人： Arshad Madni , Franco Lauria , Mark Stephen John Mudd , Lance Rhys Trodd , Nicholas Paul Cowley
IPC分类号： H03F345
CPC分类号： H03F3/45089 , H03F2203/45392 , H03F2203/45496 , H03F2203/45612
摘要： A radio frequency amplifier including a long tail pair of transistors provided with a tail current source. The bases of the transistors are driven by emitter follower transistor provided with collector load resistors. Feedback capacitors ensure stability and feedback resistors bias the amplifier without degrading noise performance. The amplifier may be driven unbalanced while retaining good second harmonic distortion performance.
摘要翻译：一种射频放大器，包括设置有尾电流源的长尾对晶体管。晶体管的基极由配有集电极负载电阻的射极跟随器晶体管驱动。反馈电容器确保稳定性和反馈电阻器偏置放大器而不降低噪声性能。放大器可能被驱动不平衡，同时保持良好的二次谐波失真性能。

2. 发明授权

US06791414B2 Signal processing stage and radio frequency tuner 失效
标题翻译：信号处理级和射频调谐器
公开(公告)号：US06791414B2
公开(公告)日：2004-09-14
申请号：US10424899
申请日：2003-04-28
申请人： Lance Trodd , Franco Lauria
发明人： Lance Trodd , Franco Lauria
IPC分类号： H03F345
CPC分类号： H03G3/3052 , H03G1/0023
摘要： A signal handling stage provides variable gain, for example for automatic gain control functions, in a radio frequency tuner. The stage comprises a transconductance stage having negative feedback via further transconductance stage. The output current of the transconductance stage is supplied to an AGC core, which steers the output current between output loads and loads for driving the transconductance stage in accordance with an AGC voltage. The amount of negative feedback is therefore varied in accordance with the AGC voltage. For relatively low gain, a large amount of feedback is used and this improves the distortion performance. For relatively high gain, the negative feedback is reduced but a good noise figure can be achieved.
摘要翻译：信号处理级在无线电频率调谐器中提供可变增益，例如用于自动增益控制功能。该级包括通过进一步跨导级具有负反馈的跨导级。跨导级的输出电流被提供给AGC内核，其转换输出负载之间的输出电流和根据AGC电压驱动跨导级的负载。因此，负反馈量根据AGC电压而变化。对于相对较低的增益，使用大量的反馈，这提高了失真性能。对于相对较高的增益，负反馈降低，但是可以实现良好的噪声系数。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式