| 摘要 |
A circuit for correcting baseline wander in a transmitter which is comprised of a main signal current driver driving a first winding of a two winding transformer which first winding is in parallel with a termination impedance matching load, comprising: a compensation current driver coupled in parallel with the main signal current driver for adding its current to current of the main signal current driver, and having a correction signal control input, a sample and hold circuit connected across the first winding, an error amplifier having a first pair of inputs connected across the first winding and a second pair of inputs connected to the output of the sample and hold circuit, for providing an error signal resulting from a difference of signals appearing at its respective pairs of inputs, and a circuit for applying the error signal to the correction signal control input of the compensation current driver, whereby any difference of a present signal carried by the first winding of the transformer, with a past signal held by the sample and hold circuit, results in an error signal and generation of a correcting current by the compensation current driver so as to substantially eliminate the difference.
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