| 发明名称 |
Method and apparatus for implementing a low noise amplifier with associated gain and input impedance |
| 摘要 |
An apparatus with associated gain and input impedance includes gain devices, a switching unit and a resistor. A first differential pair of gain devices and associated bias circuitry is configured to operate in a full gain mode. A second differential pair of gain devices is configured to operate in a reduced gain mode. The switching unit is configured to disable the first differential pair of gain devices and enable the second differential pair of gain devices in the reduced gain mode and to disable the second differential pair of gain devices and enable the first differential pair of gain devices in the full gain mode. The resistor is configured to maintain constant input impedance of the apparatus when in the reduced gain mode. |
| 申请公布号 |
US8810316(B2) |
申请公布日期 |
2014.08.19 |
| 申请号 |
US201213687589 |
申请日期 |
2012.11.28 |
| 申请人 |
Motorola Solutions, Inc. |
发明人 |
Syed Shafiullah;Heck Joseph P. |
| 分类号 |
H03F3/45;H03G3/30 |
主分类号 |
H03F3/45 |
| 代理机构 |
|
代理人 |
May Steven A.;Doutre Barbara R. |
| 主权项 |
1. An apparatus, comprising:
a first differential pair of gain devices and associated bias circuitry configured for operation in a full gain mode; a second differential pair of gain devices configured for operation in a reduced gain mode; a switching unit configured to disable the first differential pair of gain devices and enable the second differential pair of gain devices in the reduced gain mode, and to disable the second differential pair of gain devices and enable the first differential pair of gain devices in the full gain mode; and a resistor coupled across the second differential pair of gain devices, the resistor configured to maintain constant input impedance of the apparatus when in the reduced gain mode. |
| 地址 |
Schaumburg IL US |
