发明名称 |
AM transmitter with an offset voltage to the RF stage to compensate for switching time of the modulators |
摘要 |
An AM transmitter of the type including apparatus for generating a subcarrier signal, pulse width modulating this subcarrier with audio, amplifying this resulting pulse width signal using active devices operating in the more efficient switching mode is disclosed. The amplified pulse width signal is passed through a low pass filter wherein the audio is recovered and used to amplitude modulate a radio frequency stage. The improvement herein includes a means for providing an offset voltage to the RF stage so that the system will develop zero carrier output when the pulse width of the modulating signal to the active devices has a relatively small finite value.
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申请公布号 |
US4122415(A) |
申请公布日期 |
1978.10.24 |
申请号 |
US19770859189 |
申请日期 |
1977.12.09 |
申请人 |
RCA CORPORATION |
发明人 |
LUTHER, JR., ARCH CLINTON;SAUER, DAVID ARTHUR |
分类号 |
H03C1/02;(IPC1-7):H03C1/02 |
主分类号 |
H03C1/02 |
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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