利用GaAs前馈放大器去除微波振荡器中的闪烁噪声

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI:10.1109/FREQ.2001.956180

J. Everard, C. Broomfield

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引用次数: 9

摘要

在7.6 GHz微波振荡器中演示了偏移量大于10 kHz的转置闪烁噪声去除。这是通过使用基于砷化镓的前馈功率放大器作为振荡维持级来实现的。当纠错放大器接通时，在12.5 kHz偏置处演示了20 dB噪声抑制。对于大于10 kHz的偏移量，相位噪声以(1//spl Delta/f)/sup 2/的速度衰减，因此由热噪声设置为理论最小值的0-2 dB以内。给出了一些低频检测和低频反馈电路的初步结果。

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Flicker noise removal in microwave oscillators using GaAs based feedforward amplifiers

Transposed flicker noise removal is demonstrated in a 7.6 GHz microwave oscillator for offsets greater than 10 kHz. This is achieved by using a GaAs based feedforward power amplifier as the oscillation sustaining stage. 20 dB noise suppression is demonstrated at 12.5 kHz offset when the error correcting amplifier is switched on. The phase noise rolls-off at (1//spl Delta/f)/sup 2/ for offsets greater than 10 kHz and is therefore set by the thermal noise to within 0-2 dB of the theoretical minimum. Preliminary results on some low frequency detection and low frequency feedback circuits are presented.

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Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)

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