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Design >> RF Design >> parallel QVCO issue
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Message started by ieok on Oct 27th, 2010, 3:18am

Title: parallel QVCO issue
Post by ieok on Oct 27th, 2010, 3:18am

How to make sure QVCO output has accurate in-phase & quadrature phase clock?  I use the parallel type QVCO  (identical osc).

In my testbench A, the qvco works properly but when move to testbench B, it did not wok properly like:  no longer 90o shift, different swing amplitude. It looks like it depends on initial voltage of the oscillator.

thank you in advance.

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