File:US patent 4333141.jpg
Original file (1,545 × 1,763 pixels, file size: 172 KB, MIME type: image/jpeg)
Summary
[edit]| Description |
The source of this file is a clip from USPTO. A patent for a new type of active full wave rectifier. The two resistors 32 and 34 are equal, as are the two power supplies VCC and −VEE. This, if the transistor were replaced by a short circuit, the output would be at the zero level. The feedback amplifier maintains the emitter voltage equal to the input voltage, so the base voltage is one VBE drop above that and the emitter current IE is always proportional to the input voltage. For positive voltages, the collector current through resistor 32 is less than the emitter current, so the base current is high to make up the difference. The transistor is in saturation, with the output VCE(sat) above the input. For negative voltages, resistor 34 limits the emitter current to the point that resistor 32 can pull up the collector, and the circuit acts as a heavily-degenerated common-emitter amplifier with a gain of −1. | ||
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Licensing
[edit] | The text and illustrations of US patents are in the public domain in the United States unless the patent text contains a specific notice that portions are copyrighted.[1][2][3]
The original patent contains no such notice, so its contents are in the public domain in the United States. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:40, 8 September 2006 | | 1,545 × 1,763 (172 KB) | Danielflam (talk | contribs) | The source of this file is a clip from USPTO. A patent applicataion for a new type of active full wave rectifier |
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