Holding circuit for providing a large time constant by using a b

Details Holding circuit for providing a large time constant by using a b Holding circuit for providing a large time constant by using a b

1991-11-19

1992-09-15

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307603, H03K 5159, H03K 5153

Patent

active

051480557

ABSTRACT:
A holding circuit used in a pedestal level clamp circuit of a color television receiver. By using base current of a transistor as charging current of a capacitor, a large time constant is obtained. Also, in case the voltage lower than the reference voltage is held, base current of the transistor is used as discharging current to discharge slowly. Furthermore, though a charging transistor of the capacitor must be a PNP type and a discharging transistor must be an NPN type, it is designed not to be influenced by the difference in current amplification factors of the two types.

REFERENCES:
patent: 4806790 (1989-02-01), Sone

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