ADRF6655ACPZ-R7 datasheet(20/44 Pages) AD

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ADRF6655

Rev. 0 | Page 20 of 44

ADRF6655

1600MHz OUTPUT INTERFACE

VCC

1.5pF

15nH

Ω

36nH

VCC

36nH

IF OUT

1nF

150pF

1nF

150pF

1nF

Ω

ANAREN

BD1722J50200A00

Figure 57. 1600 MHz Output Matching Network (Output return loss

measured to be better than 12 dB from 1400 MHz to 1680 MHz.)

ADRF6655

2100MHz OUTPUT INTERFACE

VCC

27nH

0603CS

27nH

0603CS

IF OUT

1nF

150pF

3pF

1nF

150pF

TC1-1-13M+

Figure 58. 2100 MHz Output Matching Network (Output return loss

measured to be better than 12 dB from 2000 MHz to 2200 MHz.)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

OUTPUT FREQUENCY (GHz)

900MHz MATCH

1200MHz MATCH

1600MHz MATCH

OUTPUT P1dB

OUTPUT IP3

Figure 59. Measured Output Linearity for 900 MHz, 1200 MHz, and 1600 MHz

Matching Networks (See Figure 54, Figure 55, and Figure 57 for Implementation)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

OUTPUT FREQUENCY (GHz)

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

900MHz MATCH

1200MHz MATCH

1600MHz MATCH

Figure 60. Measured Conversion Gain for 900 MHz, 1200 MHz, and 1600 MHz

Matching Networks (See Figure 54, Figure 55, and Figure 57 for Implementation)

INPUT MATCHING

The ADRF6655 uses a balanced 50 Ω input impedance to help

simplify external connections. For low loss interfacing, the driving

source should be transformed to present a balanced 50 Ω source

impedance. An appropriate 1:1 impedance ratio input balun should

be used when attempting to interface to an unbalanced 50 Ω

source. For input frequencies below ~1.5 GHz, the TC1-1-13M+

from Mini-Circuits or similar baluns should provide good return

loss and maximum power gain. For higher frequencies, baluns,

such as the TC1-1-43A+, are recommended for lowest insertion

loss. The ac coupling capacitors can be optimized with the balun to

provide optimum input match. A few examples are provided in

Figure 61 for a range of different IF output frequencies.

–35

–30

–25

–20

–15

–10

–5

0.5

1.0

1.5

2.0

2.5

3.0

FREQUENCY (GHz)

TC1-1-43A+ WITH 10pF AC COUPLING

TC1-1-43A+ WITH 3pF AC COUPLING

TC1-1-43A+ WITH 1.8pF AC COUPLING

Figure 61. Measured RF Input Return Loss Using the TC1-1-43A+ 1:1 Balun

(Plotted for Several AC Coupling Capacitor Values)

It is also possible to use lumped element LC lattice networks to

transform an unbalanced source into a balanced source at the

mixer input pins. In either case, the mixer input pins should be

dc blocked using adequately sized series capacitors.

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