Linear Technology LTC5551 Manuale utente

dc2035af

DEMO MANUAL DC2035A

DESCRIPTION

LTC5551

300MHz to 3.5GHz Ultra-High Dynamic

Range Downconverting Mixer

Demonstration circuit 2035A features LT C

5551, which

is a 300MHz to 3.5GHz ultra high dynamic range down

converting mixer. Demo circuit 2035A is optimized for RF

input frequency range 1.1GHz to 2.7GHz. IF output port

is optimized for frequency range 116MHz to 250MHz. RF

input can be matched with few external component for a

wide range of frequencies. IF output port can be matched

externally up to 500MHz. A typical application with low

side LO injection provides the best performance for RF

input frequency range 1.1GHz to 2.7GHz.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

LTC5551 is optimized for 3.3V operation. A low power

mode is available and is activated by pulling the ISEL pin

high.Thisreducesthepowerconsumptionby1/3,however

reduces the IIP3 to approximately 29dBm.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2035A

Specifications are at VCC = 3.3V, EN = 3.3V, TC= 25°C, ISEL = LOW, PLO =

0dBm, PRF = 0dBm (∆f = 2MHz, 0dBm/tone for two-tone IIP3 tests), unless otherwise noted. Test circuit shown in Schematic Diagram.

PARAMETER CONDITION TYP UNITS

VCC Supply Voltage 2.5 to 3.6 V

VCC Supply Current EN = High, with LO Signal Applied

EN = High, ISIL = HIGH, with LO Signal Applied

204

142

Shutdown Current EN = Low <100 µA

EN Voltage Low, Chip Disabled

HIGH, Chip Enabled

<0.3

>1.2

EN Input Current VEN = 0V to 3.3V –30 to 100 µA

RF Input Frequency Range LO Signal Applied, with External Match 1.1 to 2.7 GHz

RF Input Return Loss LO Signal Applied >10 dB

IF Output Frequency Range LO Signal Applied, with External Match 116 to 250 MHz

IF Output Return Loss LO Signal Applied >10 dB

LO Frequency Range With External Match 1.0 to 3.5 GHz

LO Input Return Loss With External Match >10 dB

LO Input Power LO = 1000MHz to 3500MHz,with External LO Match –6 to 6 dBm

LO to RF leakage LO = 1000MHz to 3500MHz, with External LO Match ≤25 dBm

LO to IF leakage LO = 1000MHz to 3500MHz,with External LO Match ≤21 dBm

RF to LO Isolation RF = 1.1GHz to 2.7GHz, with External Match >55 dB

RF to IF Isolation RF = 1.1GHz to 2.7GHz, with External Match >23 dB

1.1GHz to 2.7GHz Downmixer Application: IF = 153MHz, ISEL = Low, Unless Otherwise Noted.

Power Conversion Gain RF = 1100MHz, Low Side LO

RF = 1500MHz, Low Side LO

RF = 1950MHz, Low Side LO

RF = 2700MHz, Low Side LO

2.5

2.4

1.7

Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

Absolute Maximum Ratings

Note: Stresses beyond absolute maximum ratings may

cause permanent damage to the device. Exposure to any

absolute maximum rating conditions for extended periods

may affect the device reliability and lifetime.

Supply Voltage (VCC, IF+, IF–).....................................4V

Enable Input Voltage (EN)................–0.3V to VCC + 0.3V

Power Select Voltage (ISEL)............–0.3V to VCC + 0.3V

LO Input Power (0.2GHz to 3.5GHz)................... +10dBm

LO Input DC Voltage............................................... ±0.1V

RF Input Power (0.3GHz to 3.5GHz)...................+20dBm

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

Temp Diode Continuous DC input Current..............10mA

Temp Diode Input Voltage ......................................... ±1V

IFBIAS Voltage .........................................................2.5V

Operating Temperature Range (TC)........ –40°C to 105°C

Supply Voltage Ramping

Fast ramping of the supply voltage can cause current

glitch in the internal ESD protection circuits. Depending

on supply leads inductance, this could result in a supply

voltagetransient that exceedsthemaximumrating. Asupply

voltage ramp time of greater than 1ms is recommended.

DETAILED DESCRIPTION

Supply leads used to power the demo board should be

as short as possible to minimize the lead inductance and

resistance. During power-up, connect the power leads

to the demo board before turning on the power supply.

Supply voltage should be ramped up slowly to 3.3V to

avoid any overshoot transients which may damage the IC.

Enable Feature

To enable the chip, EN voltage must be greater than 1.2V.

However, EN voltage must not exceed VCC by more than

0.3V to avoid permanent damage to the chip. When EN is

left floating, the voltage will be pulled low by the internal

pull-down resistor, and the chip will be disabled.

Low Power Mode

The LTC5551 can be set to low power mode using a digital

voltage applied to ISEL. This allows flexibility to choose a

reduced current of operation when lower RF performance

is acceptable. When ISEL is set to low (<0.3V), the mixer

operate at nominal DC current. When ISEL is set to high

(>1.2V), DC current consumption is reduced resulting in

lower RF performance. When ISEL is left floating, ISEL

is pulled down to low voltage by the internal pull down

resistor.

PERFORMANCE SUMMARY

Specifications are at VCC = 3.3V, EN = 3.3V, TC= 25°C, ISEL = LOW, PLO =

0dBm, PRF = 0dBm (∆f = 2MHz, 0dBm/tone for two-tone IIP3 tests), unless otherwise noted. Test circuit shown in Schematic Diagram.

PARAMETER CONDITION TYP UNITS

2-Tone 3rd Order Intercept RF = 1100MHz, Low Side LO

RF = 1500MHz, Low Side LO

RF = 1950MHz, Low Side LO

RF = 2700MHz, Low Side LO

36.0

35.5

38.1

dBm

2-Tone Input 2nd Order Intercept

(∆f = 154MHz = fIM2)

RF = 1950MHz (2027MHz/1873MHz), LO = 1797MHz 58.4 dBm

SSB Noise Figure RF = 1950MHz, Low Side LO 9.7 dB

Input 1dB Compression RF = 1950MHz, Low Side LO 18 dBm

Low Power Mode, IF = 153MHz, ISEL = High

Power Conversion Gain RF = 1950MHz, Low Side LO 2.4 dB

Input 3rd Order Intercept RF = 1950MHz, Low Side LO 29.3 dBm

SSB Noise Figure RF = 1950MHz, Low Side LO 8.3 dB

Input 1dB Compression RF = 1950MHz, Low Side LO 16.7 dBm

Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

DETAILED DESCRIPTION

Temperature Diode

TheLTC5551provides anon-chipdiode connectedtoTEMP

on the demo board. TEMP is connected to the anode of

the internal ESD diode. The junction temperature can be

measured by injecting a 10µA current into TEMP pin. The

voltage vs temperature coefficient of the diode is about

–1.72mV/°C with 10µA current injected into the TEMP pin.

RF Input

The RF input of DC2035A is externally matched from

1100MHz to 2700MHz, with return loss greater than

10dB. However, the RF input match can be shifted down

to 300MHz, or up to 3500MHz by replacing the external

matching components, see Table 1. A series DC blocking

capacitor must be used if DC voltage is present at the RF

input to avoid damage to the internal input transformer.

LO Input

The LO input on DC2035A is externally matched from

1000MHz to 3500MHz with series 3.9pF capacitor. Match-

ing below 1000MHz can be accomplished by adding a

shunt component at C3, see Table 1. A series DC blocking

capacitor must be used to avoid damage to the integrated

transformer if DC voltage is present at the LO input.

Table 1. Matching Values at Other Frequencies (See Schematic Diagram)

APPLICATION RF MATCH LO MATCH IF TRANSFORMER

RF (MHz) LO X1 C1 X2 C2 C3 T1 VENDOR

300 to 650 HS 15nH 15pF 15pF 15pF 8.2pF TC4-1W-7ALN+ Mini-Circuit

500 to 1100 HS 13nH 6.8pF 4.7pF 8.2pF 2.2pF WBC4-6TLB Coilcraft

1100 to 2700 LS, HS 7.5nH 2.2pF – 3.9pF – TC4-1W-7ALN+ Mini-Circuit

2300 to 3500 LS, HS 1.2pF 22pF 2.2nH 3.9pF – TC4-1W-7ALN+ Mini-Circuit

RF Input Return Loss (with LO Signal Applied)

LO Input Return Loss

IF Output

IF output port can be matched for IF frequencies as low as

5MHz, and as high as 500MHz. Standard demo board is

matched for center frequency 153MHz. Other frequencies

can be matched by changing the values of L1, and L2. See

table below for inductor values for other IF frequencies.

RF FREQUENCY (GHz)

RETURN LOSS (dB)

40 123

dc2035a RF

LO FREQUENCY (GHz)

RETURN LOSS (dB)

25 1.5 2.5 3.5

dc2035a LO

4.01.00.5 2.0 3.0

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

QUICK START PROCEDURE

Demonstration circuit 2035A is easy to set up to evalu-

ate the performance of the LTC5551. Refer to Figures 1

to 3 for proper equipment connections and follow the

procedures below:

Note: Care should be taken to never exceed absolute

maximum input ratings. Make all connections with RF

and DC power off.

Return Loss Measurements

1. Configure the network analyzer for return loss measure-

ment, set appropriate frequency range, and set the test

signal to 0dBm.

2. Calibrate the network analyzer.

3. Connect all test equipment as shown in Figure 1 with the

signal generator and the DC power supply turned off.

4. Ramp up VCC supply voltage to 3.3V, and verify that the

current consumption is approximately 204mA with LO

signal applied and ISEL set to Low. The correct supply

voltage should be confirmed, measured at the demo

board to account for the voltage drop across supply

leads.

5. Set the LO source to provide a 0dBm, CW signal to the

demo board LO input port at appropriate LO frequency.

6. With the LO signal applied, and the unused demo board

ports terminated in 50Ω, measure return losses of the

RF input and IF output ports.

7. Terminate the RF input and the IF output ports in 50Ω.

Measure return loss of the LO input port.

RF Performance Measurements

1. Connect all test equipment as shown in Figure 2 with the

signal generators and the DC power supply turned off.

2. Ramp up the VCC supply voltage to 3.3V, and verify

that the current consumption is approximately 204mA

with LO signal applied. The supply voltage should be

confirmed at the demo board VCC and GND terminals

to account for the voltage drop across wire leads.

3. Set the LO source signal generator to provide 0dBm,

CW signal to the demo board LO input port at the ap-

propriate LO frequency.

4. Set the RF sources, to provide the two tone inputs at

0dBm per tone, CW signal 2MHz apart to the demo

board RF input port at the appropriate RF frequency.

5. Measure the resulting IF output on the spectrum

analyzer:

DETAILED DESCRIPTION

IF Return Loss (with LO Signal Applied) Table 2. Inductor Matching Values vs IF Frequencies

L1,L2 vs IF Frequencies

IF (MHz) L1, L2 (nH) COMMENTS

120 820 Coilcfraft 0603 LS

153 470 Coilcfraft 0603 LS

240 180 Coilcfraft 0603 LS

305 120 Coilcfraft 0603 LS

380 56 Coilcfraft 0603 LS

456 33 Coilcfraft 0603 LS

IF FREQUENCY (MHz)

RETURN LOSS (dB)

12 300

dc2035a IF

500200100 400

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

a. Measure The wanted two-tone IF output signals are

located at:

Low Side LO:

fIF1 = fRF1 – fLO,

fIF2 = fRF2 – fLO

High Side LO:

fIF1 = fLO – fRF1,

fIF2 = fLO – fRF2

b.The3rdorderintermodulationproducts which are closest

to the wanted IF signals are used to calculate the input

3rd order intercept, where ∆IF = fIF2 – fIF1:

fIM3,1 = fIF1 – ∆IF

fIM3,2 = fIF2 + ∆IF

b. Calculate the input 3rd order intercept:

IIP3 = (∆IM3)/2 + PRF

Where ∆IM3 = PIF – PIM3

6. Turn off one of the RF signal generators, and measure

conversion gain, RF to IF isolation, LO to IF leakage,

and input 1dB compression point.

Noise Figure Measurements

1. Configure and calibrate the noise figure meter for mixer

measurements.

2. Connect all test equipment as shown in Figure 3 with

signal generator and DC power supply turned off.

3. Increase VCC supply voltage to 3.3V, and verify that the

current consumption is approximately 204mA with LO

signal applied. The supply voltage should be confirmed

at the demo board VCC and GND terminals to account

for voltage drop across supply leads.

4. Set LO source to provide a 0dBm, CW signal to the

demo board LO input port at appropriate LO frequency.

5. Measure the single-sideband noise figure.

QUICK START PROCEDURE

Figure 1. Proper Equipment Setup for Return Loss Measurements

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

QUICK START PROCEDURE

Figure 2. Proper Equipment Setup for RF Performance Measurements

Figure 3. Equipment Setup for SSB Noise Figure Measurements

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

HARDWARE SETUP

LTC5551 is an ultrahigh dynamic range downconverting

mixer with very high input third order intercept point.

Accuracy of its performance measurement is highly de-

pendent on equipment setup and measurement technique.

The recommended setups are presents in the following

pages. The following precautions should be observed:

1. Use high performance signal generators with low har-

monic output and low phase noise, such as Rohde &

Schwarz SME06 or equivilent. Filter may be used at the

signal generators to suppress higher order harmonics.

For example, when measuring 2nd order product spurs.

2. A high quality RF power combiner that provide broad-

band 50Ω termination on all ports, and have excellent

port-to-port isolation must be used to get the best RF

performance, such as MCLI PS2-17.

3. High performance amplifiers with high IP3 is recom-

mended at the inputs to improve the isolation when

performing the two-tone measurements. High isolation

minimizes the modulation of the two sources, thus

improving the source IP3.

4. Use attenuator pads with good broadband VSWR on

the demonstration board’s input and output ports.

They provide the improved return loss that can re-

duce the interstage reflections which can degrade RF

performance.

5. Use a high dynamic range spectrum analyzer such as

FSEM 30 for linearity measurements.

6. Use narrow resolution bandwidth (RBW) and engage

video averaging on the spectrum analyzer to lower dis-

played average noise level (DANL) in order to improve

sensitivity and to increase dynamic range. However,

the trade off is increased sweep time.

7. Spectrum analyzer produces its own nonlinearity when

overdriven. Generally, 30dB of input attenuation is suf-

ficient for linearity measurements. Appropriate amount

of attenuation should be used so that the spectrum

analyzer nonlinearity does not degrade the device under

test (DUT) RF performance. However, using too much

input attenuation will result is higher noise level, and

decreased dynamic range.

8. Before starting any RF measurements, the input sig-

nal must be calibrated. The input signal IP3 must be

verified to be much better than the DUT so that the

measurement equipment does not degrade the overall

RF measurement result.

P1dB Compression Measurement

Figure 2 can be modified for the P1dB compression

measurement. Turn off one of the input signal generators,

sweep the input power so that LTC5551 conversion gain

is reduced by 1dB. The input power at which conversion

gain is reduced by 1dB is the Input referred 1dB compres-

sion point. However, signal generators and amplifiers at

the input also introduce additional compression into the

signal path. Therefore, the 6dB pad after the combiner

is removed for this test so that LTC5551’s compression

point is accurately measured.

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

PCB LAYOUT

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2035af

DEMO MANUAL DC2035A

PCB LAYOUT

dc2035af

DEMO MANUAL DC2035A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., C0G, 2.2pF, ±0.1pF, 50V, 0402 AVX, 04025A2R2BAT2

2 1 C2 CAP., C0G, 3.9pF, ±0.1%, 50V, 0402 AVX, 04025A3R9BAT2A

3 0 X2, R3, C3 0402, OPT

4 2 C4, C6 CAP., 0.56µF, 10%, 10V, X5R, 0603 AVX, 0603ZD564KAT2A

5 2 C5, C7 CAP., 22pF, 50V, 5%, NPO, 50V, 0402 AVX, 04025A220JAT2A

6 2 C8, C9 CAP., X7R, 1000pF, 10%, 50V, 0402 AVX, 04025C102KAT2A

7 5 E1-E5 TURRET, PAD 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0

8 1 J1-J3 CONN., SMA 50Ω EDGE-LAUNCH E. F. JOHNSON, 142-0701-851

9 2 L1, L2 IND., WIRE-WOUND, 470nH, 2%, 0603 COILCRAFT, 0603LS-471XGLB

10 1 X1 IND., WIRE-WOUND, 7.5nH, 0402 COILCRAFT, 0402hp-7N5XJL

11 2 R1, R2 RES., CHIP, 475Ω, 1%, 0402 VISHAY, CRCW0402475RFKED

12 1 T1 TRANSFORMER, SMT, RF WIDEBAND, 4:1 MINI-CIRCUITS, TC4-1W-7ALN+

13 1 U1 IC., LINEAR TECHNOLOGY, LTC5551IUF LINEAR TECH., LTC5551IUF

Indice

Altri manuali Linear Technology Miscelatore

Linear Technology

Linear Technology 642 Manuale utente

Linear Technology

Linear Technology DC 1710A-D Manuale utente

Linear Technology

Linear Technology 1233A Series Manuale utente

Linear Technology

Linear Technology LTC5549 Guida rapida alla configurazione

Linear Technology

Linear Technology DC2322A Guida rapida alla configurazione

Manuali Miscelatore popolari di altre marche

Bosch

Bosch GRW 9 Manuale utente

MULTIQUIP

MULTIQUIP Whiteman WM45E Guida

KitchenAid

KitchenAid KSM7581BZ0 Guida rapida

Jay-Lor

Jay-Lor 5050 Manuale utente

Sunbeam

Sunbeam FPSBSM210X Manuale utente

MULTIQUIP

MULTIQUIP Whiteman MC94S Guida

Thinky

Thinky ARE-250 Manuale utente

Midas

Midas XL4 Manuale utente

bianco

bianco PURO 4 Manuale utente

Paso

Paso DAG9200 Manuale utente

Sima

Sima SFX-9A Manuale utente

better chef

better chef IM-815WC Istruzioni per l'installazione

ALLEN & HEATH

ALLEN & HEATH GR1 Manuale utente

Lacor

Lacor 69083 Scheda tecnica

M-Audio

M-Audio Midiman SAM Manuale utente

Buffalo

Buffalo CP921 Manuale utente

Pentair

Pentair HYPRO Cleanload 3376-0870 Istruzioni operative

Cuisinart

Cuisinart SM50WHE Manuale utente