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本文阐述了在雷达接收机中频(30兆赫)系统中采用六级双增益级差分对晶体管放大电路时,由于它本身是采用双向截止限幅而不是饱和限幅,故避免了晶体管基区积累大量少数载流子现象。这样使接收机中频(30兆赫)系统响应速度很快,对雷达目标强回波后面的弱信号有较强的显示能力,如果管子及线路参数选得正确时,则可做到:小信号具有高增益,大信号具有低增益,输出信号与输入信号幅度成对数关系,输入动态范围可达80分贝以上。如果对数起点选在接收机噪声电平以下10分贝时,它还具有恒虚警特性。
This article illustrates the use of a six-stage dual-gain stage differential pair transistor amplifier in a mid-frequency (30 MHz) radar receiver system that avoids the accumulation of a large number of base regions of the transistor due to the use of bidirectional cutoff rather than saturation clipping Minority carrier phenomenon. This allows the receiver mid-frequency (30 MHz) system to respond quickly to weak signals behind the radar target strong echo has a strong display capability, if the pipe and line parameters selected correctly, you can do: small signal has High gain, large signal with low gain, the output signal and the input signal amplitude in a logarithmic relationship, the input dynamic range up to 80 dB or more. It also has a constant false alarm if the logarithmic start is selected at 10 dB below the noise level of the receiver.