[APPARATUS AND METHOD FOR DETECTING AND COMPENSATING CURRENT OFFSET]
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United States of America Patent
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N/A
Issued Date -
Jun 30, 2005
app pub date -
Mar 2, 2004
filing date -
Dec 26, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A quadrature modulator and a transmitter capable of detecting and reducing a current offset are provided. The quadrature modulator comprises a base band transconductance for converting a voltage signal into a current signal and a switching pair for modulating the current signal. A current sink is further coupled after the base band transconductance for detecting a current offset of the current signal. When the current sink is enabled to detect the current offset of the transmitter within a predetermined time interval, the switching pair is disabled, and after the predetermined time interval lapses, the current sink is disabled and the switching pair is enabled.
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