| 摘要 |
An output amplifier stage covers a flat frequency range of DC to microwave frequencies with provisions for independent control of input and output DC offset. The output amplifier stage includes a standard AC coupled microwave amplifier for high frequency performance. The AC coupled amplifier is intended for use as an output stage in a pulse pattern generator, although it can be used in any application where broadband frequency operation is needed with control of DC at its input and output. The DC control is provided using circuitry providing a DC bypass path around an AC coupled amplifier. The bypass path is provided between two Bias T circuits, one Bias T before and one Bias T after the AC coupled amplifier. An adjustable DC bias offset is further provided to the AC amplifier input. A feed forward signal is further provided from the input to the output of the AC coupled amplifier to supply a missing DC and low frequency component to the AC coupling of the high frequency amplifier stage.
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