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Interactive Design Tools: Logarithmic Amplifiers : Miscellaneous Calculations from the AD8313 Datasheet
A tool for calculating component values for changing the slope and intercept of the AD8304 logarithmic converter.
Instructions | Troubleshooting | Related Information
Frequency
range
Corner
VSLOPE V/dBm   PINT dBm dBm
Z0 ohms Correction
factor
Additional
Gain
dB Launch AD8313 impedance matching tool Calculate gain from match
(with 191mil stub)

Calculate gain (no stub)

LOG (RSSI) MODE
New VSLOPE V/dBm REXT kOhms
Input scale

CONTROLLER MODE
VSET   V PT   dBm
Input scale

Instructions

Setup

  • Select the Frequency range and process Corner of interest. VSLOPE and PINT should be automatically updated in the fields directly below, but they can be modified if necessary.
  • For other than 50 ohm use, enter Z0 in the provided field.
  • A Correction factor is needed for waveforms other than purely sinusoidal. Select the type of signal to be estimated from the pulldown menu.
  • If Additional gain is needed or to add your own correction factor, use the provided field. One possible source of gain is in the matching components. Click on the matching chart link to calculate a simple LC match for the AD8313. After a suitable match is found, click "Done" to close the window and enter the calculate gain in the Additional gain field.
Log (RSSI) mode
  • After the system params have been entered, the response of the AD8313 with VSET-VOUT shorted is shown in blue (top chart). A more steeply sloped response can be obtained by changing REXT or by entering the desired slope in New VSLOPE (which will calculate the corresponding REXT). The new response is shown in red.
Controller mode
  • Enter VSET and the power threshold (PT) will be calculated and plotted (bottom chart).


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Troubleshooting

The pop-up matching feature of this tool is currently incompatible with Mozilla-based browsers such as Netscape 6&7 and has consequently been disabled for those browsers.

For further troubleshooting information, please visit our Interactive Tools troubleshooting page.


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Related Information

AD8313 Product Page

Logarithmic Amplifier Selection Table


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