Class-AB driver design with improved frequency response

Details Class-AB driver design with improved frequency response Class-AB driver design with improved frequency response

2008-01-09

2010-02-23

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S273000

Reexamination Certificate

active

07667540

ABSTRACT:
A class-AB driver design with improved frequency response is disclosed. In one embodiment, the class-AB driver includes a push-pull output stage, a trans-linear loop, an input stage, a current biasing and enabling circuit. Further, the trans-linear loop is coupled to a signal input terminal ABINvia node A, and the push-pull output stage is coupled to the trans-linear loop via node B and node C. Further, the trans-linear loop includes a speed balancing resistor RB in a faster signal traveling path (i.e., ABINto ABOUTvia node A and B) to match up the speed with a slower signal traveling path (i.e., ABINto ABOUTvia node A and C). In another embodiment, the MOS transistors are also used instead of the speed balancing resistor RB to balance the signal traveling time of the two signal traveling paths.

REFERENCES:
patent: 6657495 (2003-12-01), Ivanov et al.
patent: 6657496 (2003-12-01), Chen et al.
patent: 7253685 (2007-08-01), Chung
patent: 7271653 (2007-09-01), Chung
patent: 7548114 (2009-06-01), Yu

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