User Manual

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion

Receivers

24 ______________________________________________________________________________________

I/Q Mixer and VGA1

Output Load Requirements

To retain acceptable linearity performance, the mixer

and VGA1 output loads should be >600Ω.

Layout Issues

A properly designed PC board is an essential part of

any RF/microwave circuit. Use controlled impedance

lines on all frequency inputs and outputs. Use low-

inductance connections to ground on all ground pins

and wherever the components are connected to

ground. Place decoupling capacitors close to all V

connections. For proper chip operation, the metal pad-

dle at the back of the chips must be grounded through

via holes in the board.

Table 2. MAX2700 LNA S-Parameters Low-Gain Mode (V

= 3.0V)

Table 1. MAX2700 LNA S-Parameters High-Gain Mode (V

= 3.0V)

FREQUENCY (GHz)

|S11| ∠S11 |S21| ∠S21 |S12| ∠S12 |S22| ∠S22

1.70 0.542 -84.1 7.09 53.97 0.023 65.36 0.367 37.3

1.75 0.485 -82.9 7.412 41.4 0.025 46.6 0.286 11.4

1.80 0.471 -80.1 7.268 29.5 0.024 34.3 0.216 -23.1

1.85 0.466 -78.8 7.07 19.9 0.0243 29.6 0.185 -68.4

1.90 0.443 -79.2 6.977 10.1 0.025 22.5 0.217 -99.5

1.95 0.441 -79.3 6.635 0.2 0.025 13.8 0.306 -127

2.00 0.436 -84.8 6.115 -7.96 0.024 16.4 0.387 -152.8

2.05 0.324 -88.3 6.119 -13.47 0.0338 15.23 0.408 -165

2.10 0.288 -74.9 5.947 -22.7 0.0383 -4.813 0.476 -176.7

2.15 0.300 -66.7 5.687 -31.1 0.0387 -20.7 0.529 172

2.20 0.320 -63.1 5.31 -40.5 0.0384 -32.8 0.587 162.4

FREQUENCY (GHz) |S11| ∠S11 |S21| ∠S21 |S12| ∠S12 |S22| ∠S22

1.70 0.637 -65.6 0.731 52.5 0.018 77 0.398 41.5

1.75 0.625 -66.3 0.763 42.9 0.018 52 0.328 21.8

1.80 0.622 -67.1 0.772 31.3 0.016 40 0.258 -7

1.85 0.618 -67.3 0.76 21.2 0.014 39 0.191 -45

1.90 0.617 -67 0.758 10.3 0.014 38 0.203 -79

1.95 0.617 -69.2 0.717 -1.1 0.015 34 0.238 -114

2.00 0.616 -70.1 0.678 -10.7 0.014 24 0.332 -141

2.05 0.611 -71.8 0.603 -13 0.022 37.6 0.323 -105

2.10 0.611 -74.5 0.634 -19.5 0.028 13.4 0.36 -170

2.15 0.61 -76.8 0.634 0.27 0.03 -5 0.402 -178

2.20 0.6 -80 0.621 -37 0.033 -14 0.484 174