Data Sheet

ADL6316

Rev. 0 | Page 21 of 37

APPLICATIONS INFORMATION

LINEARITY OPTIMIZATION

The linearity in the ADL6316 can be optimized through the

TRM_AMP2_IP3 (Register 0x11B, Bits[1:0]) and TRM_

AMP2_CB (Register 0x10B, Bits[1:0]) settings. Set the IP3_OFF

bit (Register 0x101, Bit 1) 0x00 for OIP3 optimization. The

TRM_AMP2_IP3 bits control the switches in the second

amplifier that enables optimal third-order distortion cancellation

and optimal OIP3. The TRM_AMP2_CB bits control the

common base bias current on the transistor and allows

additional linearity optimization.

35

36

37

38

39

40

41

42

43

44

45

500

600

700

800

900

1000 1100 1200 1300 1400 1500

RF FREQUENCY (MHz)

TRM_AMP2_IP3 = 0

TRM_AMP2_IP3 = 1

TRM_AMP2_IP3 = 2

TRM_AMP2_IP3 = 3

Figure 43. OIP3 vs. RF Frequency for Various TRM_AMP2_IP3 Settings,

TRM_AMP2_CB = 0x02, TRM_AMP1_IREF_x and TRM_AMP2_IREF_x = 0x02

Figure 43 shows that the OIP3 is optimizable across the

TRM_AMP2_IP3 settings.

PERFORMANCE AND POWER OPTIMIZATION

The ADL6316 provides another level of control to optimize

power or performance. In applications where performance is

critical, the ADL6316 offers performance optimization at the

expense of power consumption. However, if low power is the

priority, the ADL6316 offers tuning options through the

TRM_AMPx_IREF_1 (Register 0x117 and 0x119, Bits[3:0])

in the amplifier blocks of the chip to further reduce power

consumption.

Table 20 shows that the potential power optimization vs.

performance can fine tune the reference current on RF

amplifier settings.

ADJACENT AND ALTERNATE CHANNEL POWER

RATIOS ON LTE OPERATION

Figure 44 shows the adjacent and alternate channel power ratios

(CPR) for the ADL6316 using 5 MHz one-carrier LTE. The

adjacent CPR is −71.4 dB and the alternative CPR is −75.3 dB at

an RF of 960 MHz. The adjacent and alternate CPR performance

varies over output power. On the ADL6316, the output power

can be varied by adjusting the input power, the VVA attenuation,

or the DSA attenuation. Figure 45 to Figure 47 show adjacent and

alternate CPR vs. output power at an RF of 960 MHz for the

different methods of controlling the ADL6316.

As shown in Figure 45, the optimum adjacent and alternate CPR

can be achievable at an output power of 5 dBm, which corresponds

to an input power of −25.2 dBm driving the ADL6316 where the

internal VVA is set to 0 dB, and the DSA is set to 0 dB attenuation.

Figure 46 and Figure 47 show adjacent and alternate CPR vs.

output power that is adjusted by VVA attenuation and by DSA

attenuation, respectively, with −14.9 dBm of input power. Figure 45

to Figure 47 show below −65 dB adjacent and alternate CPR

performance at below 10 dBm output power, and there is gradual

degradation above 10 dBm from the contribution to the adjacent

and alternate CPR performance of the second stage RF amplifier.

When fixing the VVA attenuation and sweeping the DSA, the

adjacent and alternate CPR performance remains constant

below 6 dBm output power (see Figure 47).

Table 20. Power Optimization vs. Performance at 960 MHz, VVA Attenuation = 0 dB, DSA Attenuation = 0 dB, TRM_AMP2_IP3 = 0x02

TRM_AMPx_IREF_1 Setting (Decimal)

(Register 0x117 and Register 0x119, Bits[3:0])

DC Power (W)

Gain (dB)

OP1dB (dBm)

OIP3 (dBm)

NF (dB)

3

2.32

30.71

24.32

40.89

5.98

2

2.06

30.71

24.54

41.21

5.88

1

1.8

30.62

24.51

40.73

5.78

0

1.5

30.24

24.39

38.60

5.72