关于VCO buffer

It depends on the specs of the VCO output buffer. For 1GHz frequency, simple inverter chains could be used as buffers, say for GSM transmitter. Generally speaking, ac couple should be used to remove the common mode output. For accurate 50 duty cycle, a correction feedback loop might be required, or you could design your VCO to work at 4GHz and divide the output by 4.

谢谢， ac couple这个方法倒是听说过，但是一般的论文好像都不会提到这个，correction feedback loop这个没有听说过，一般采用什么结构呢?有相应的论文吗 ?  

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