发明名称 |
Clipper circuitry suitable for signals with fractional-volt amplitudes |
摘要 |
A clipper includes an amplifier having a non-inverting input node, an inverting input node, and an output node. A feedback transistor has its base connected to the amplifier output node and its collector connected to the non-inverting input node for providing unilaterally conductive degenerative current feedback between the output node and the non-inverting input node. A resistor is connected between the non-inverting input node and an input terminal for conducting a current supplied via the collector-to-emitter path of the feedback transistor which is proportional to the amplitude of an unclipped portion of the signal applied between the input terminal and the inverting input node. When a reference potential is applied to the inverting input node and an AC input signal varying about the reference potential is applied to the input terminal, the stage functions as a negative half-wave rectifier. When the reference potential is applied to the input terminal and the AC input signal is applied to the inverting input node, the stage functions as a positive half-wave rectifier. Two rectifying stages can be interconnected with the collectors of the feedback transistors connected in common to form a full-wave rectifier. The output of the full-wave rectifier can be used to control the gain of an amplifying means producing the AC signal being detected.
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申请公布号 |
US5381106(A) |
申请公布日期 |
1995.01.10 |
申请号 |
US19920967854 |
申请日期 |
1992.10.28 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
LIMBERG, ALLEN L. |
分类号 |
H04N9/793;H03G7/00;H03G11/00;H03G11/04;H03K5/08;H04N9/83;H04N9/84;H04N9/87;H04N9/873;(IPC1-7):H03K5/00;H03K5/22 |
主分类号 |
H04N9/793 |
代理机构 |
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主权项 |
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