Automatic biasing of a power device for linear operation

Details Automatic biasing of a power device for linear operation Automatic biasing of a power device for linear operation

2006-08-01

2006-08-01

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

Reexamination Certificate

active

07084705

ABSTRACT:
A power device(s) is biased and operates in Class-AB. Crossover distortion is minimized over a broad range of operating conditions, not only for a nominal case. The bias current of a power transistor is automatically adjusted in response to process and temperature variations. Preferably, the adjustment is performed using an error-feedback arrangement. An exemplary ‘rule’ for bias adjustment involves satisfying a proportionality relationship between the small-signal device transconductance at the operating point, and a maximum device transconductance. A dual replica master-slave control architecture is utilized. A self-adapting circuit is provided to change the bias current (or voltage) so that the value is always the optimum value, irrespective of operating temperature and/or process variations. Self-biasing is introduced wherein no manual adjustment is necessary. A stable amplifier is formed having great robustness to process and temperature variations.

REFERENCES:
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patent: 6937102 (2005-08-01), Lopez et al.
patent: 2005/0077963 (2005-04-01), Behzad

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