Claims
- 1. Kinescope driver apparatus, comprising:
- an amplifier (60) comprising first (Q1) and second (Q2) transistors connected in a cascode configuration, the first transistor having a base electrode for receiving a video input signal, having an emitter electrode coupled to a point of reference potential via a first resistor (62) and having a collector electrode connected to the emitter electrode of said second transistor, said second transistor having a base electrode coupled to a source of reference potential (+12V) and having a collector electrode coupled via a second resistor (68) to a source of relatively high supply voltage, said second resistor providing a linearly amplified video output signal at said collector electrode of said second transistor;
- a kinescope (20) having a cathode electrode (K1) coupled to said second resistor (68) for producing images representative of said video input signal; and
- circuit means (Q3, 82), coupled between said cathode electrode of said kinescope and a selected electrode of said first transistor, for applying a given portion of cathode current (Ik) conducted by said cathode electrode (K1) of said kinescope (20) to said selected electrode; and wherein
- said circuit means comprises a buffer amplifier (70) coupled between said second resistor and said cathode electrode; and
- a resistor (82) connected between a current output of said buffer amplifier and said selected electrode of said first transistor.
- 2. Kinescope driver apparatus, comprising:
- an amplifier (60) comprising first (Q1) and second (Q2) transistors connected in a cascode configuration, the first transistor having a base electrode for receiving a video input signal, having an emitter electrode coupled to a point of reference potential via a first resistor (62) and having a collector electrode connected to the emitter electrode of said second transistor, said second transistor having a base electrode coupled to a source of reference potential (+12V) and having a collector electrode coupled via a second resistor (68) to a source of relatively high supply voltage, said second resistor providing a linearly amplified video output signal at said collector electrode of said second transistor;
- a kinescope (20) having a cathode electrode (K1) coupled to said second resistor (68) for producing images representative of said video input signal; and
- circuit means (Q3, 82), coupled between said cathode electrode of said kinescope and a selected electrode of said first transistor, for applying a given portion of cathode current (Ik) conducted by said cathode electrode (K1) of said kinescope (20) to said selected electrode; and wherein
- said circuit means comprises a PNP transistor (Q3) having an emitter electrode connected to said cathode (K1) of said kinescope, having a base electrode connected to said second resistor (68) of said amplifier (60) and having a collector electrode connected to said emitter electrode of said first transistor.
- 3. Kinescope driver apparatus, comprising:
- an amplifier (60) comprising first (Q1) and second (Q2) transistors connected in a cascode configuration, the first transistor having a base electrode for receiving a video input signal, having an emitter electrode coupled to a point of reference potential via a first resistor (62) and having a collector electrode connected to the emitter electrode of said second transistor, said second transistor having a base electrode coupled to a source of reference potential (+12V) and having a collector electrode coupled via a second resistor (68) to a source of relatively high supply voltage, said second resistor providing a linearly amplified video output signal at said collector electrode of said second transistor;
- a kinescope (20) having a cathode electrode (K1) coupled to said second resistor (68) for producing images representative of said video input signal; and
- circuit means (Q3, 82), coupled between said cathode electrode of said kinescope and a selected electrode of said first transistor, for applying a given portion of cathode current (Ik) conducted by said cathode electrode (K1) of said kinescope (20) to said selected electrode; and wherein
- said circuit means comprises a PNP transistor (Q3) having an emitter electrode connected to said cathode (K1) of said kinescope, having a base electrode connected to said second resistor (68) of said amplifier (60) and having a collector electrode connected to said collector electrode of said first transistor.
- 4. Kinescope driver apparatus, comprising:
- an amplifier (60) comprising first (Q1) and second (Q2) transistors connected in a cascode configuration, the first transistor having a base electrode for receiving a video input signal, having an emitter electrode coupled to a point of reference potential via a first resistor (62) and having a collector electrode connected to the emitter electrode of said second transistor, said second transistor having a base electrode coupled to a source of reference potential (+12V) and having a collector electrode coupled via a second resistor (68) to a source of relatively high supply voltage, said second resistor providing a linearly amplified video output signal at said collector electrode of said second transistor;
- a kinescope (20) having a cathode electrode (K1) coupled to said second resistor (68) for producing images representative of said video input signal; and
- circuit means (Q3, 82), coupled between said cathode electrode of said kinescope and a selected electrode of said first transistor, for applying a given portion of cathode current (Ik) conducted by said cathode electrode (K1) of said kinescope (20) to said selected electrode; and
- means for apportioning said cathode current into said given portion for application to said selected electrode of said first transistor and into a further portion for application to an automatic kinescope bias circuit.
Parent Case Info
This is a continuation of application Ser. No. 08/587,044 filed Jan. 12, 1996 now abandoned which is a continuation of 234,026 filed Apr. 28, 1994, now abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (2)
Number |
Date |
Country |
196 694 |
Oct 1986 |
EPX |
575 824 A2 |
Dec 1993 |
EPX |
Continuations (2)
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Number |
Date |
Country |
Parent |
587044 |
Jan 1996 |
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Parent |
234026 |
Apr 1994 |
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