发明名称 |
Apparatus for amplifying an RF signal |
摘要 |
According to the apparatus of the present disclosure, dual gate control and dual gain control uses variable voltages on the gates of first stage (302) and a second stage (304) to control the output power. In alternate embodiments, dual drain control is also employed using a variable voltage supply on the drains of the first stage (302) and the second stage (304). In particular, a level shifter circuit (421) is employed to convert a positive voltage gate control signal to negative voltage with respect to ground. Drain current limiting circuits (417, 419) are used to sample drain currents and generate gate voltages to maintain a desired current ratio between stages of a multi-stage amplifier. When dual drain control is also employed, a 1:1 ratio of drain control voltages is employed at low power levels, with a single drain control at higher power levels.
|
申请公布号 |
US6049704(A) |
申请公布日期 |
2000.04.11 |
申请号 |
US19970988490 |
申请日期 |
1997.12.10 |
申请人 |
MOTOROLA, INC. |
发明人 |
PECKHAM, DAVID S.;LANDHERR, MICHAEL F.;KLOMSDORF, ARMIN W.;PENNOCK, MARK A. |
分类号 |
H03G3/00;H03G3/30;(IPC1-7):H03G3/30 |
主分类号 |
H03G3/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|