| 摘要 |
A fixed-gain power amplifier receives a preamplifier output signal and produces a power output signal. The preamplifier output signal is amplified by the fixed-gain power amplifier to produce the power output signal. The variable-gain preamplifier receives an input signal, a preamplifier control signal, and produces the preamplifier output signal. The input signal is amplified by a preamplifier amount of gain by the variable-gain preamplifier to produce the preamplifier output signal. The preamplifier amount of gain is based on the preamplifier control signal. A variable attenuator receives the power output signal, an attenuator control signal, and produces an output signal. The power output signal is attenuated by an attenuator amount of attenuation by the variable attenuator to produce the output signal. The attenuator amount of attenuation is based on the attenuator control signal.
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