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1. 发明申请

US20020145475A1 Dual conversion RF synthesizer utilizing improved push-push VCO design 审中-公开
标题翻译：双转换RF合成器利用改进的推挽VCO设计
公开(公告)号：US20020145475A1
公开(公告)日：2002-10-10
申请号：US09829609
申请日：2001-04-10
申请人： APA Wireless Technologies
发明人： Eliot Fenton , Claudio Cassina , Zhong Han , Joseph Paniccia
IPC分类号： H03B005/18 , H03L007/18 , H03L007/197
CPC分类号： H03L7/23 , H03B5/1841 , H03B21/02 , H03L7/091 , H03L7/1974 , H03L7/20 , H03L2207/10 , H03L2207/12
摘要： A dual conversion, noise resistant, digitally-controlled mm-wave frequency synthesizer for generating rapidly-tunable RF signals. The prime signal-generation source is a 3.0-3.2 GHz low noise wide band voltage controlled oscillator (nullvconull). The oscillator includes a buried stripline hairpin resonator having dual-tuning circuits to increase bandwidth coverage and unique bias circuitry to improve phase noise. The oscillator frequency is multiplied by a factor of two, yielding a 6.0-6.4 GHz signal that is mixed with a fixed locally generated carrier of 3900 MHz, the output of which represents the first Intermediate Frequency (IF). This IF is then mixed with 1950 MHz (3900 MHz divided by two), yielding a second IF that covers the 188 to 550 MHz range. The 2nd IF is divided down and phase locked to an external reference using a commercially available chip set. The 6.0-6.4 phase locked signal is then re-mixed with the 3.0-3.2 GHz output form the oscillator, thereby yielding a 9.0-9.6 GHz signal. The 9.0-9.6 signal is then multiplied by two to yield a 18.0-19.2 GHz signal. This signal is amplified by a mm-wave amplifier, which also contains a detector diode for output power monitoring. The voltage from the detector diode is fed back to an on-board microcontroller which maintains the RF output power within an acceptable range. By using harmonically related signals for the mix approach, no mixer spurious signals are generated.
摘要翻译：双转换，抗噪声，数字控制的mm波频率合成器，用于产生快速可调RF信号。主要信号源是3.0-3.2 GHz低噪声宽带压控振荡器（“vco”）。所述振荡器包括具有双调谐电路以增加带宽覆盖率和唯一偏置电路以改善相位噪声的掩埋带状线发夹谐振器。振荡器频率乘以因子2，产生与3900MHz的固定本地生成的载波混合的6.0-6.4GHz信号，其输出表示第一中间频率（IF）。然后将该IF与1950MHz（3900MHz除以2）混合，产生覆盖188至550MHz范围的第二IF。使用市售芯片组将第二个IF分频并锁定到外部参考。然后将6.0-6.4锁相信号与振荡器的3.0-3.2 GHz输出重新混合，从而产生9.0-9.6 GHz信号。然后将9.0-9.6信号乘以2，以产生18.0-19.2 GHz信号。该信号由毫米波放大器放大，该放大器还包含用于输出功率监测的检测器二极管。来自检测器二极管的电压被反馈到板上微控制器，其将RF输出功率维持在可接受的范围内。通过使用混合方式的谐波相关信号，不产生混频器杂散信号。

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