Methods and apparatus for calibrating gm-Z

Details Methods and apparatus for calibrating gm-Z Methods and apparatus for calibrating gm-Z

2007-05-15

2007-05-15

Shingleton, Michael B. (Department: 2815)

Oscillators

Ring oscillators

C331S044000, C455S318000, C455S255000, C455S256000, C455S150100, C455S192100

Reexamination Certificate

active

10854980

ABSTRACT:
In one embodiment of the present invention, an apparatus includes a plurality of gain stages each having a gain greater than one, and which are coupled to create a positive feedback at an oscillation frequency. The gain stages may be formed of transconductance gain stages which may be coupled together as a ring oscillator or a latch type circuit. Such circuits may be used as calibration circuits in which small signal parameters of the gain stages are directly calibrated, and are used in turn to directly calibrate small signal parameters of a target circuit.

REFERENCES:
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patent: 5995819 (1999-11-01), Yamaji et al.
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patent: 6198356 (2001-03-01), Visocchi et al.
patent: 6388510 (2002-05-01), Hayashi et al.
patent: 2005/0275477 (2005-12-01), Crawley

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