DC offset correction of a power detector used with a...

Details DC offset correction of a power detector used with a... DC offset correction of a power detector used with a...

2011-08-23

2011-08-23

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter

Amplitude modulation

C455S114200, C455S127200

Reexamination Certificate

active

08005441

ABSTRACT:
The present invention relates to estimating a direct current (DC) offset of a power detection circuit when an estimated instantaneous amplitude of a continuous-transmission amplitude-modulated (AM) radio frequency (RF) signal is below a first threshold. The power detection circuit may be used to estimate an average output power associated with the continuous-transmission AM RF signal. The estimated average output power may be used as part of a feedback system to regulate the average output power. The estimated DC offset of the power detection circuit may be used to improve the estimate of the average output power, particularly over temperature and supply voltage variations. Estimating the DC offset of the power detection circuit when the estimated instantaneous amplitude of the continuous-transmission AM RF signal is below the first threshold may minimize errors in the estimated DC offset.

REFERENCES:
patent: 6745015 (2004-06-01), Yochem
patent: 7369820 (2008-05-01), Rahman
patent: 2005/0255814 (2005-11-01), Song et al.

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