ADMV4530 datasheet(38/64 Pages) AD

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Data Sheet

ADMV4530

APPLICATIONS INFORMATION

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Rev. C | 38 of 64

IF AGC CONFIGURATION

The ADMV4530 includes an AGC circuit on the IF input port. The

four bit fields that control the functionality of this AGC follow:

1. AGC_EN (Register 0x101)

2. AGC_EN_OVERRIDE (Register 0x102)

3. IF_DET_EN_OVERRIDE (Register 0x102)

4. DET_RANGE (Register 0x10C)

5. AGC_VREF_GEN (Register 0x10D)

The AGC_EN bit enables or disables the AGC that is only truly

enabled when in power-down mode. The AGC_EN_OVERRIDE

and IF_DET_EN_OVERRIDE bits enable the AGC and detector

regardless of the power-down mode.

The DET_RANGE bit field selects the appropriate range for the

internal power detector, and the AGC_VREF_GEN bit field deter-

mines the voltage reference set point for the AGC.

Figure 95 shows an example of the output power vs. the input pow-

er level for various settings of DET_RANGE and AGC_VREF_GEN.

The first number in the Figure 95 legend is the DET_RANGE

setting (decimal value), and the second number in the Figure 95

legend is the AGC_VREF_GEN setting (decimal value).

Figure 95. Power Sweep for Various AGC Settings

Figure 96 shows the output power given a −20 dBm input IF signal

and sweeping the AGC voltage reference set point for various

DET_RANGE settings.

Figure 96. AGC Voltage Reference Sweep

When AGC is enabled, the AGC voltage needed for the IF gain

control is accessible on the EXT_CAP_N pin (Pin 10). When the

AGC is disabled, this pin functions as an input for the IF amplifier

gain control.

ERROR VECTOR MAGNITUDE PERFORMANCE

The error vector magnitude performance of the ADMV4530 is

measured at an RF frequency of 29.98 GHz (fractional mode,

phase noise adjusted as shown in Figure 93) and an RF frequency

of 30 GHz (integer mode) with a single 12 MHz, 8 quadrature phase

shifting keying (QPSK) carrier in I/Q mode, 0 Hz offset, 0.2 roll-off

factor, and LO and sideband rejection nulled. The measurement

was performed at TA = 25°C.

Figure 97 shows the transmitter error vector magnitude vs. the

output power. The transmitter has an approximately 3% error vector

magnitude with an output power of 12 dBm.

Figure 97. Error Vector Magnitude vs. Output Power, 8 QPSK Modulation,

12 MHz Bandwidth

ADMV4530 Datasheet(PDF) 38 Page - Analog Devices

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