Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1996-07-18
1998-06-02
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327362, H03L 500
Patent
active
057606293
ABSTRACT:
A level detector 2 detects variation of the amplitude of an input signal a to output a level signal b representing HIGH or LOW in order to define the head portion of the input circuit a. A time constant control signal 3 generates a time constant control signal c based on the level signal b to control a time constant of an estimator 4 so as to make the time constant small for a prescribed period from a time when the level signal b varies from HIGH to LOW. The estimator 4 estimates DC offset included in the input signal a with the a time constant variation according to the time constant control signal c to output an estimate d. A compensator 1 subtracts the estimate d from the input signal a to obtain a compensation output. Therefore, in the estimator 4, the speed of estimating the DC offset is different between a period corresponding to the head portion of the input signal a and other periods. Thus, a DC offset compensation device can be configured to be capable of fast DC offset compensation at the head portion of the input signal a and stable DC offset compensation at the other portions.
REFERENCES:
patent: 4612450 (1986-09-01), Gilz et al.
patent: 5182476 (1993-01-01), Hanna et al.
patent: 5304941 (1994-04-01), Tateishi
patent: 5539779 (1996-07-01), Nagahori
Takai Hitoshi
Tatsuta Akihiro
Urabe Yoshio
Yamasaki Hidetoshi
Matsushita Electric - Industrial Co., Ltd.
Tran Toan
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