Transient enhancement circuit for CRT amplifier
US5726540A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Dec 22, 1995 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Dec 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/648
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transient improvement circuit is disclosed for cathode ray tube (CRT) amplifiers with automatic kinescope bias feedback circuits. An NPN transistor and a PNP transistor are provided, each having a collector, an emitter and a base. A video input signal is applied to the base of the NPN transistor. A first collector resistor is connected between the collector of the NPN transistor and a power supply voltage, the collector of the NPN transistor also being connected to the base of the PNP transistor. A first emitter resistor is connected between the emitter of the NPN transistor and ground, and the first emitter resistor has, connected in parallel therewith, a filter capacitor and a second emitter resistor connected in series with the filter capacitor. A third emitter resistor, having a first end and a second end, is also provided, wherein the first end is connected to the emitter of the PNP transistor and a forward-biased diode and a first capacitor are connected, in parallel, across the base of the PNP transistor and the second end of the third emitter resistor. A second collector resistor is connected between the collector of the PNP transistor and ground and an output resistor is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.