# 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