PA1

ANTENNA

LMV232

RF

INPUT

OUT

R1

6.2 k:

PA2

RF

INPUT

FB

BS

SD

GND

A3

B3

C1

B1

A1

C3

C2

A2

R3

50:

C1

1.5 nF

COUPLER

COUPLER

TO BASEBAND

R2

50:

LMV232

www.ti.com

SNWS017C – DECEMBER 2004 – REVISED MARCH 2013

Figure 21. Typical Application

The detection curves of Figure 22 show the detector response to RF input power. To show the complete dynamic

voltage is defined as the output voltage in the absence of an RF input signal (at 25°C). The best-fit ideal mean

square response is represented by the fitted curve in Figure 22. The input referred error of the detection curves

with respect to this best-fit mean square response is determined as follows:

•

Determine the best-fit mean square response.

•

Determine the output referred error between the actual detector response and the ideal mean square

response.

•

Translate the output referred error to an input referred error.

Figure 22. Detection Curve

The best-fit linear curve is obtained from the detector response by means of linear regression. The output

referred error is calculated with the formula:

Where,

To translate this output referred error (in dB) to an input referred error, it has to be divided by a factor of 2. This

is due to the mean square characteristic of the device. The response of a mean square detector changes by 2

dB for every dB change of the input power. Figure 23 depicts the resulting curve.

Copyright © 2004–2013, Texas Instruments Incorporated

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