发明名称 |
HIGH EFFICIENCY DIGITAL POWER AMPLIFIER |
摘要 |
A digital power amplifier (or power switching amplifier or power switch) for use in a digital transmitter includes a low impedance multi-stage driver circuit having a low impedance pre-driver and a low impedance driver. The drive circuit drives a power switch stage having two power transistors configured in a current mode class-D push-pull configuration. Utilization of gallium nitride (GaN) transistors or pseudomorphic high electronic mobility transistors (pHEMT) (or combination thereof) and sizing the transistors progressively larger in the driver than in the pre-driver (at least about 3x) provides a reduction in output impedance of the driver circuit and progressive increases in the power driving capability of the succeeding stage. This allows the use of a power amplifier at higher frequencies without altering or affecting the power efficiency and allows use of a digital power amplifier for a digital transmitter. |
申请公布号 |
EP2100372(A2) |
申请公布日期 |
2009.09.16 |
申请号 |
EP20070853050 |
申请日期 |
2007.10.30 |
申请人 |
NORTEL NETWORKS LIMITED |
发明人 |
OUTALEB, NOUREDDINE;BERGSMA, ADRIAN;ILOWSKI, JOHN |
分类号 |
H03F3/193;H03F3/217;H03F3/45 |
主分类号 |
H03F3/193 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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