发明名称 |
Drive circuit with limited signal transition rate for RFI reduction |
摘要 |
An amplifier applies turn-on bias to the gate electrode of an output field-effect transistor in response to a first level of an input signal applied to the amplifier. A switched power source supplies operating current to the amplifier for developing the turn-on bias when the amplifier input signal is at the first level. A feedback-controlled bypass circuit diverts a portion of the operating current from the amplifier during an initial turn-on period and gradually reduces the magnitude of the diverted operating current as the output transistor turns on thereby producing a "soft" turn-on of the output transistor so as to minimize a potential for creating radio frequency interference in nearby RFI sensitive devices such as the tuner in a television or radio receiver. Complementary circuits include dual current supply and diversion circuits providing controlled rise and fall times for complementary field-effect output transistors.
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申请公布号 |
US4739193(A) |
申请公布日期 |
1988.04.19 |
申请号 |
US19860924867 |
申请日期 |
1986.10.30 |
申请人 |
RCA CORPORATION |
发明人 |
DOTY, II, JAMES H. |
分类号 |
G11C7/22;G11C8/18;H03K19/003;(IPC1-7):H03K17/16 |
主分类号 |
G11C7/22 |
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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