Peak holding circuit for a color television receiver

Details Peak holding circuit for a color television receiver Peak holding circuit for a color television receiver

1988-09-16

1990-07-17

Coles, Sr., Edward L.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307315, 318151, 358 27, H04N 518, H03K 5159

Patent

active

049423142

ABSTRACT:
A peak holding circuit comprises a capacitor for holding signal charges corresponding to a peak level of an input signal, and a current amplifier circuit comprising transistors connected in a triple darlington manner for supplying an output current corresponding to the held charges. An emitter of a transistor in the first stage out of the transistors connected in a darlington manner is connected to a collector of another transistor through which a collector cut-off current flows which is approximately equal to a collector cut-off current flowing through the transistor in the first stage. The other transistor has its emitter connected to ground. Therefore, the collector cut-off current flowing through the transistor in the first stage is cancelled, so that fluctuations in output current can be prevented even if a large reactive current is not allowed to flow through a transistor in the final stage out of the transistors connected in a darlington manner.

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