Systems and methods for initializing PLLs and measuring VCO...

Details Systems and methods for initializing PLLs and measuring VCO... Systems and methods for initializing PLLs and measuring VCO...

2006-03-28

2006-03-28

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331S016000

Reexamination Certificate

active

07019572

ABSTRACT:
Systems and methods for measuring the characteristics of voltage controlled oscillators within these circuits and initializing the circuits without coupling circuitry to the voltage control node that could introduce noise at this node. One embodiment includes a PLL circuit having a charge pump and control circuitry for driving the charge pump, where the control circuitry is configured to provide “up” and “down” signals to the charge pump in a normal operational mode or a test/initialization mode. In the normal mode, the control circuitry passes signals received from a phase frequency detector through to the charge pump as the up and down signals. In the test/initialization mode, the control circuitry overrides at least one of the signals received from the phase frequency detector to drive the charge pump to generate a selectable test voltage which is used by a voltage controlled oscillator to generate an output signal at a corresponding frequency.

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