H - Electricity – 03 – K
Patent
H - Electricity
03
K
330/25
H03K 3/26 (2006.01) H03F 3/04 (2006.01) H04N 9/73 (2006.01)
Patent
CA 1111521
ABSTRACT OF THE DISCLOSURE A semiconductor amplification device which can be fabricated as a monolithic semiconductor structure is provided for use in an automatic gray scale control circuit for a color television receiver. During the blanking inter- val, the control circuit senses the cut-off voltage of each gun of a three gun color cathode ray tube and stores that voltage. During the video field, the stored voltage is used to energize the driver for the individual gun and to bias that gun. The automatic gray scale function for each gun requires two amplifiers of high current gain, high inverse impedance, only one of which is on at a time, and a consolidation of the sensing and output functions in two terminals. These functions are achieved in a four transistor configuration in which two cascaded pairs of emitter folloer transistor am- plifiers are connected in a closed loop. A high inverse impedance is achieved by the provision of a second emitter in the output transistor of each cascaded pair, coupled to the base of the preceding transistor to insure turn off.
273063
Company General Electric
Eckersley Raymond A.
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