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采用混合集成电路工艺,设计了一款小尺寸限幅低噪声放大器(LNA)。优化了限幅电路设计,明显缩小了电路体积。低噪声放大器采用负反馈结构,以改善增益平坦度。采用平衡式结构,提高限幅器的功率容量和放大器的1 dB压缩点输出功率(P-1 dB)。设计制作了Lange电桥,作为平衡式限幅放大器的输出电桥。该放大器工作电压5 V,电流151 mA,测试结果显示,在频带2.7~3.0 GHz内,噪声系数小于1.5 dB,小信号功率增益大于36 dB,增益平坦度小于0.6 dB,输入输出驻波比小于1.3,P-1 dB大于13 dBm。该限幅放大器能够承受脉冲功率300 W、脉宽300μs和占空比为30%的信号,外形尺寸为27 mm×18 mm×5 mm。
Using a hybrid integrated circuit process, a small-size, low-noise amplifier (LNA) was designed. Optimized limiting circuit design, significantly reduced the circuit size. Low-noise amplifier with negative feedback structure to improve the gain flatness. A balanced architecture improves the limiter’s power capacity and amplifier’s 1 dB compression point output power (P-1 dB). The Lange bridge was designed and manufactured as the output bridge for a balanced limiting amplifier. The operating voltage of the amplifier is 5 V and the current is 151 mA. The test results show that the noise figure is less than 1.5 dB in the frequency range of 2.7-3.0 GHz, the small signal power gain is greater than 36 dB, the gain flatness is less than 0.6 dB, the input / output VSWR is less than 1.3, P-1 dB is greater than 13 dBm. The limiting amplifier can withstand signals with pulse power of 300 W, pulse width of 300 μs and duty cycle of 30% with an external dimension of 27 mm × 18 mm × 5 mm.