Preliminary Technical Data UG-1828
Rev. PrC | Page 181 of 338
• Peak detect can achieve faster response time comparing with peak/power detect. For applications requiring “fast attack” and “fast
recovery”, peak detect provides better performance.
• “Fast recovery” mode should not be used when it is required to increase gain only at the frame or subframe boundary.
• For applications requiring “fast attack” and “fast recovery”, SLS delay should be set as short as possible to minimize the delay while
allowing sufficient time to set the gain changes.
TES CONFIGURATION AND DEBUG INFORMATION
User could interact with the receiver gain control functionality through API commands as discussed in previous sections or through
ADRV9001 Transceiver Evaluation Software (TES). While using TES, user should first configure the receiver gain control operation mode
and the signal detector operation mode as shown in Figure 165. (Note TES design could continuously change, see the ADRV9001
Evaluation System section for updated information.)
This configuration page is under GPIO Configurations tab in TES. Gain Control Mode provides user three options which are
Automatic, Manual Pin, and Manual SPI, which are corresponding to the AGC, MGC with pin control and MGC with SPI control. By
default, it is set as Manual SPI. When Manual Pin is selected, user should further select the GPIO pins for gain increment and
decrement. After selecting the gain control mode, user can further configure the Detection Mode which has two options “Peak Only”
and Peak and Power. By default, it is set as Peak Only mode. The Detection Mode indicates which AGC mode is configured when the
Gain Control Mode is selected as Automatic. When the Gain Control Mode is selected as Manual Pin or Manual SPI, it further enables
the ADRV9001 internal signal detectors in either Peak Only or Peak and Power mode. By configuring the GPIO pins, user is allowed to
retrieve the signal detector status which could be used to control receiver gain in Manual mode. Note the signal detector status could also
be retrieved in AGC mode.
Figure 165. TES Configuration for Rx Gain Control Mode and Signal Detector Operation Mode
After configuring Gain Control Mode and Detection Mode, user could further configure signal detector parameters, interface gain and
manual control parameters under the Gain Control tab in TES as shown in Figure 166 and Figure 167. In Figure 166, AGC mode is
selected and in Figure 167, MGC Pin mode is selected. As shown in both figures, TES provides three sections for user configurations. The
first section is Rx Interface Gain. User can choose Manual or Automatic receiver interface gain control. When Manual is selected, user
can further enter the desired interface gain value and when the gain update should take effective (note interface gain configuration relates
to the selection of gain table. User should first select Rx gain table type at the bottom of this configuration page in TES.) The second
section displays the current gain control mode. If AGC is configured as shown in Figure 166 users are not allowed to enter the other
parameters in this section. If MGC is configured as shown in Figure 167, user should further configure other parameters. With MGC Pin
mode, user should configure the targeted Manual Gain Index as well as the step sizes. The third section displays the detection mode user
selected and it allows user to configure the signal detector related operating parameters, such as Peak Overload threshold and Peak
Underload Threshold (they apply to both APD and HB detectors), Gain Refresh Period, Max Gain Index, and Min Gain Index when
Peak Only mode is selected. Note some selections are greyed out either because they are not configurable due to current software
limitation or not applicable in the selected modes. TES provides sanity checks for the parameter user enters so when the value is out of
range, the user input is not allowed.
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