Explicit 1st Order PLL

The Explicit 1st Order PLL recovery method lets you provide a clock from the circuit that you are measuring and apply a first-order PLL.

When the Explicit 1st Order PLL clock recovery mode is selected, the dialog box has these controls:

• Symbol Rate — Displays the signal's measured symbol rate.

  For explicit clock recovery methods, Clock Frequency is used in place of Symbol Rate.

  The Select From List drop-down menu lets you select typical rates for standard communication interface technologies. The Auto Set Symbol Rate button runs a data rate measurement and populates the Symbol Rate field with the data rate measured on the input signal.

• Loop Bandwidth — You can specify the PLL's loop bandwidth either by entering it directly in the Loop Bandwidth field (also known as the -3 dB BW) or by entering the Loop Bandwidth Divisor value.

• Loop Bandwidth Divisor — Enter a number that you divide the Symbol Rate by to get the loop bandwidth.

Explicit Clock Settings

• Explicit Clock Source — This specifies the input source of the provided clock to be used for clock recovery.

• Edge Direction — Lets you specify the edges used in the explicit clock: Rising edges, Falling edges, or Both rising and falling edges.

• Clock Multiplier — This specifies the multiplier of the provided clock to be used.

• Clock Frequency — The clock frequency of the PLL.

Advanced Settings

• Settling Time
• Idle Clock Count
• Clock/Data Alignment
• Clock Delay