Linear Technology LT5557 Manuel utilisateur

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1131A

HIGH SIGNAL LEVEL DOWNCONVERTING MIXER

LT5557

DESCRIPTION

Demonstration circuit 1131A is optimized for evalua-

tion of the LT5557 active downconverting mixer with

transformer-based IF output matching. Its RF input

and LO input ports are internally matched to 50Ω

ΩΩ

Ω,

from 1.6 to 2.3GHz, and from 1 to 5GHz, respectively.

The IF output is 50Ω

ΩΩ

Ωmatched to 240MHz using an L-C

bandpass network followed by an 8:1 transformer.

The LT5557 active mixer is optimized for high linearity,

wide dynamic range downconverter applications. The

IC includes a high-speed differential LO buffer amplifier

driving a double-balanced mixer. Broadband, inte-

grated transformers on the RF and LO inputs provide

single-ended 50Ω

ΩΩ

Ωinterfaces. The differential IF output

allows convenient interfacing to differential IF filters

and amplifiers, or is easily matched to drive a single-

ended 50Ω

ΩΩ

Ωload, with or without an external trans-

former.

The LT5557’s high level of integration minimizes the

total solution cost, board space and system-level varia-

tion.

Design files for this circuit board are available. Call

the LTC factory.

, LT, LTC, and LM are registered trademarks of Linear Technology Corporation.

Table 1.

Typical Demonstration Circuit Performance Summary (V

= 3.3V, EN = High, TA= 25°C, f

= 1950MHz, P

= -6dBm, f

1710MHz, P

= -3dBm, IF output measured at 240MHz, unless otherwise noted. Test circuit shown in Figure 2.)

PARAMETER CONDITION VALUE

Supply Voltage 2.9 to 3.9V

Total Supply Current EN = High (> 2.7V) 81.6mA

Maximum Shutdown Current EN = Low (< 0.3V) 100µA

RF Input Frequency Range Return Loss > 12dB 1600 to 2300MHz

LO Input Frequency Range Return Loss > 10dB 1000 to 4200MHz

IF Output Frequency Range Return Loss > 10dB 220 to 260MHz

LO Input Power -8 to 2dBm

Conversion Gain 2.9dB

Input 3

Order Intercept 2 RF tones, -6dBm/tone, ∆f = 1MHz 24.7dBm

Single-Sideband Noise Figure 11.7dB

LO to RF Leakage < -45dBm

LO to IF Leakage < -42dBm

RF to LO isolation > 42dB

RF to IF isolation > 41dB

2RF-2LO Output Spurious Product

= f

± f

/2) F

= 1830MHz, P

= -6dBm, f

= 240MHz -53dBc

3RF-3LO Output Spurious Product

= f

± f

/3) F

= 1790MHz, P

= -6dBm, f

= 240MHz -70dBc

Input 1dB Compression 8.8dBm

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1131A

HIGH SIGNAL LEVEL DOWNCONVERTING MIXER

APPLICATION NOTE

ABSOLUTE MAXIMUM INPUT RATING

Supply Voltage (V

CC1

, V

CC2

, IF

) ................. 4V

Enable Voltage ........................–0.3V to V

+ 0.3V

LO Input Power........................................ +10dBm

LO Input DC Voltage ..................... -1V to V

+ 1V

RF Input Power ........................................ +12dBm

RF Input DC Voltage..................................... ±0.1V

CAUTION: This part is sensitive to electrostatic dis-

charge (ESD). Observe proper ESD precautions when

handling the LT5557.

FREQUENCY RANGE

Demonstration circuit 1131A is optimized for evaluat-

ing the LT5557 IC for downconverting a RF signal in

the frequency range of 1.6GHz to 2.3GHz to a 240MHz

IF frequency with either low-side or high- side LO in-

jection.

The LT5557’s RF input is internally matched to 50Ω

ΩΩ

Ω

from 1.6GHz to 2.3GHz with better than 12dB return

loss. Its LO input port is internally matched to 50Ω

ΩΩ

Ω

from 1GHz to 5GHz with better than 10dB return loss.

The frequency range of both ports is easily extended

with simple external matching. Please refer to the

LT5557 datasheet Applications Information section.

Demonstration circuit 1131A utilizes a transformer for

impedance transformation and differential to single-

ended conversion on the IF output port. The IF output

is 50Ω

ΩΩ

Ωmatched for 240MHz, but can be modified for

other IF frequencies. Equations for calculating com-

ponent values, as well as values for several common IF

frequencies are given in the LT5557 datasheet Applica-

tions Information section.

TEST EQUIPMENT AND SETUP

Refer to Figure 1 for proper measurement equipment

setup.

Use high performance signal generators with low har-

monic output for 2-tone measurements. Otherwise,

low-pass filters at the signal generator outputs should

be used to suppress higher-order harmonics.

High quality combiners that provide broadband 50Ω

ΩΩ

Ω

termination on all ports and have good port-to-port

isolation should be used. Attenuators on the outputs

of the signal generators are recommended to further

improve source isolation, to prevent the sources from

modulating each other and generating intermodulation

products.

Spectrum analyzers can produce significant internal

distortion products if they are overdriven. Generally,

spectrum analyzers are designed to operate at their

best with about –30dBm to -40dBm at their input. Suf-

ficient spectrum analyzer input attenuation should be

used to avoid saturating the instrument.

Before performing measurements on the DUT, the sys-

tem performance should be evaluated to ensure that:

1) a clean input signal is obtained, and 2) the spectrum

analyzer internal distortion is minimized.

QUICK START PROCEDURE

Demonstration circuit 1131A is easy to set up to evalu-

ate the performance of the LT5557. Refer to Figure 1

for proper measurement equipment setup and follow

the procedure below:

Note 1: Care should be taken to never exceed absolute

maximum input ratings.

Note 2: DC power should never be applied to the EN

pin before it is applied to the V

pin.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1131A

HIGH SIGNAL LEVEL DOWNCONVERTING MIXER

Connect all test equipment as shown in Figure 1.

Apply 3.3V DC supply power, and verify that the cur-

rent consumption is approximately 81.6mA.

Apply RF and LO input signals to perform AC meas-

urements.

Set the LO signal generator (#1) to provide a

1710MHz, -3dBm, CW signal to the demo board LO

IN port.

Set the RF signal generators (#2 and #3) to provide

two –6dBm CW signals to the demo board RF IN

port—one at 1950MHz, and the other at 1951MHz.

Set the Spectrum Analyzer’s frequency range to cap-

ture the 240MHz IF output. Sufficient spectrum ana-

lyzer input attenuation should be used to avoid satu-

rating the instrument.

Conversion gain and Input 3

order intercept can be

measured:

Gc = P1 – Pin

IIP3 = (P1 – P3) / 2 + Pin

Where P1 is the lowest power level of the two fun-

damental output tones at either 240MHz or at

241MHz, P3 is the largest 3

order product at either

239MHz or at 242MHz, and Pin is the input power

(in this case, -6dBm). All units are in dBm.

To measure the 2RF-2LO output spurious product,

turn off signal generator 3. Set signal generator 2 to

= f

+ f

/2. In this case, f

= 1710MHz +

240MHz / 2 = 1830MHz. Then the desired output

would be at 120MHz, and the 2RF-2LO output spur

would be at 240MHz. The dBc difference between

the two outputs is the 2RF-2LO output spurious

product.

Follow the same procedure for 3RF-3LO output spu-

rious product measurement. This time, set signal

generator 2 to f

= f

+ f

/3 = 1710MHz +

240MHz / 3 = 1790MHz. The desired output would

be at 80MHz, and the 3RF-3LO output spur would

be at 240MHz. The dBc difference between the two

outputs is the 3RF-3LO output spurious product.

10.

Measure RF to LO isolation, LO leakages, and Input

1dB compression.

11.

Single-Sideband Noise Figure can be measured on a

noise figure meter. Refer to noise figure meter

manual for instructions. Be sure to use a high qual-

ity signal generator and a band-pass filter on the LO

input. A band-pass filter on the RF input port is re-

quired for image suppression.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1131A

HIGH SIGNAL LEVEL DOWNCONVERTING MIXER

Figure 1.

Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1131A

HIGH SIGNAL LEVEL DOWNCONVERTING MIXER

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