Filter circuit for integrated circuit

Details Filter circuit for integrated circuit Filter circuit for integrated circuit

1992-02-19

1993-11-30

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307556, 328167, 330252, 330257, H03B 104

Patent

active

052668525

ABSTRACT:
Transistors Q11 and Q12 constitute a first differential amplifier, their emitters are connected with each other by a resistor R1 and also connected respectively to constant-current sources CS11 and CS12. Transistors Q15 to Q17 constitute a second differential amplifier, and the collector of the transistor Q16 is connected with a current mirror 17. This current mirror circuit 17 is constituted by transistors Q18 and Q19 and resistors R3 and R4. The capacitor 22 is supplied with a current from the current mirror circuit 17, and its voltage is fed back through a buffer circuit 14 to the base of the transistor Q12 as a component of the first differential amplifier.

REFERENCES:
patent: 4558287 (1985-12-01), Tanaka
patent: 4804904 (1989-02-01), Katakura
patent: 4812773 (1989-03-01), Yamamoto et al.

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