DC1646A - Demo Manual

DEMO MANUAL DC1646A
LTC5564
15GHz RF Power Detector
with Comparator
Description
The demonstration circuit 1646A features the LTC®5564, an
UltraFast™ RF peak detector with a built in gain-selectable
high speed operational amplifier and comparator.
plans. The Demo Circuit Modification page provides the
design information required for modifying with this demo
circuit 1646A.
The 1646A demo circuit includes a simple impedance
matching network that provides better than 10dB return
loss for working frequencies ranging from 5.2GHz to
6.2GHz and from 14.7GHz to 16.5GHz. The input matching
circuit can be easily changed for other working frequency
Design files for this circuit board are available at
http://www.linear.com/demo
PERFORMANCE SUMMARY
PARAMETER
Supply Voltage
Supply Current
Amplifier Characteristics
VOUT Output Offset
Demodulation Bandwidth
VOUT Output Voltage Swing
Comparator Characteristics
VCOMP Low
VCOMP High
Comparator Response Time
Comparator Hysteresis
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
(TA = 25°C), VCC = VCCRF = VCCA = VCCP = 5V
CONDITIONS
Supply Voltage = 5V, No RFIN
Gain1
Gain2
Gain4
Gain8
Supply Voltage = 3.3V, No RFIN
Gain1
Gain2
Gain4
Gain8
Gain1, VOUT = 500mV
Gain2, VOUT = 500mV
Gain4, VOUT = 500mV
Gain8, VOUT = 500mV
Supply Voltage = 3V to 5V
TYP
44
UNITS
V
mA
290
295
315
360
mV
mV
mV
mV
280
280
290
315
75
52
35
15
mV
mV
mV
mV
MHz
MHz
MHz
MHz
V
0.3
Supply Voltage = 5V
Supply Voltage = 5V
10dBm RFIN Step to VCOMP 50%
RF Characteristics
RFIN Frequency Range
RFIN AC Input Resistance
RFIN Input Shunt Capacitance
RFIN Input Power Range
MIN
3
MAX
5.5
VCCA – 1.6
0.2
4.8
9
10
0.6
Frequency = 1000MHz, Power Level = 0dBm
Frequency = 1000MHz, Power Level = 0dBm
V
V
ns
mV
15
GHz
16
Ω
pF
dBm
135
0.77
–24
Digital I/O
LOW = 0.8V (Max), HIGH = VCCA – 0.8V (Min)
LEN
Comparator Enable
Comparator Disable
VCCA –0.8
0.8
V
V
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1
DEMO MANUAL DC1646A
quick start procedure
Operation
The demonstration circuit 1646A is preconfigured to work
for applications at frequencies of 5.8GHz and 15GHz. It has
better than 15dB return loss at these targeted frequencies.
The input dynamic range at 5.8GHz is 40dB (from –24dBm
to 16dBm) and slightly lower sensitivity at 15GHz.
Comparator
The high speed comparator compares the external reference voltage on the VREF pin to the internal signal voltage
VP from the peak detector and produces the output logic
signal VCOMP. VP is the internal comparator positive input
as shown in Figure 1 Simplified Block Diagram.
The demo board has a typical 10mV hysteresis for its
comparator and its response time can be as fast as 9ns
(10dBm input power step to VCOMP 50%) through out its
supporting frequencies.
The, 1646A demo board’s, LEN test point provides latch
enable/disable functionality of the comparator. The comparator is always enabling with the pulling down 10k resistor
(R8) to ground. Connecting The LEN test point to VCC will
place the comparator in the disable mode.
The R1 and R2 footprints are optional for configuring DC
voltage of the VREF test point. The C1 is the ground coupling
capacitor of the, R1 and R2, voltage divider.
VCCRF
RFIN
VCCA
VCCP
250Ω
8pF
80µA
1.2k
VP
VBIAS
LEN
+
–
VCOMP
+
–
VREF
VOUTADJ 1.7k
1.6k
200Ω
200Ω
+
–
PROGRAMMABLE
FEEDBACK ARRAY
VOUT
DC1664 F01
PINS 3, 4,
EXPOSED PAD PIN 17
G1
Figure 1. Simplified Block Diagram
G0
The VCC_COMP (E11) test point is an alternative output
of VCOMP (J2 SMA connector). Install a 0Ω resistor
or a jumper to R3 will have the comparator Output at
VCC-COMP test point.
Loading Bypass Capacitors
The LTC5564 has been designed to directly drive a capacitive load of 10pF at VOUT. When driving a capacitive load
greater than 10pF a series resistance should be added
between VOUT and the load to maintain good stability. This
resistance should be placed as close to VOUT as possible.
The demo board 1646A is loaded with R series = R6 = 0Ω.
Refer to Table 2 for typical series resistor (R6) values for
various capacitive loads.
Table 2. Typical Series Resistor (R6) Values for VOUT Capacitive
Loading
CLOAD
R SERIES(R6)
Up to 10pF
0Ω
11pF to 20pF
40Ω
21pF to 100pF
68Ω
Greater Than 100pF
100Ω
Amplifier
The high speed amplifier offers four gain settings and
is capable of driving a 1.7mA load with an output swing
range of approximately 295mV to VCC – 1.6V.
The standard demonstration circuit 1646A has a unity
gain. Therefore, the pins G0 and G1 (or the test point
Gain0 and Gain1) are pulling down for the logical Low with
R10 = R11 = 10k resistors. The pins can be connected
to VCC forming the logical High for others gains setting.
Refer to Table 3 for gain setting operation.
The VOUTADJ pin provides output DC offset adjustment
to satisfy various interface requirements. Setting VOUT
to 500mV also provides the maximum demodulation
bandwidth in each gain mode.
The R9, R12 and C13 footprints are provided on the demo
board to configure the VOUTADJ DC voltage. The R9 and
R12 are forming voltage divider topology and the C13
is the ground coupling capacitor. Refer to the LTC5564
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2
DEMO MANUAL DC1646A
quick start procedure
data sheet for Typical Performance Characteristics curve
or Table 3 for the typical VOUTADJ voltage for the desired
VOUT DC output offset in each gain setting.
The VCC_OUT (E12) test point is an alternative output of
VOUT (J3 SMA CONNECTOR). Install a 0Ω resistor or a
jumper at R5 will have the VOUT at this VCC_OUT test point.
The R7 and C12 footprints are provided for output loading
at designed resistance and capacitance.
Demonstration circuit 1646A is easy to setup for evaluating the performance of the LTC5564. Refer to Figure 2 for
measurement equipment set-up and follow the procedure
below:
A. Measure Detector Output Power (VOUT):
Connect DC power supply’s negative (–) lead to demo
board GND test point and positive (+) lead (between
3V to 5.5V) to VCC test point.
Connect a DC volt meter to the VOUT port (SMA
connector J3) to measure the DC detector output
voltage.
Connect signal generator’s output to demo board RFIN
(SMA connector J1) via coaxial cable. It is common
practice to include a 2dB or 3dB attenuation pad to
minimize reflections back into the signal generator.
(Typical 540mV VOUT with 0dBm input power at 5.8GHz)
B. Measure Comparator Output (VCOMP):
Connect DC power supply’s negative (–) lead to demo
board GND test point and positive (+) lead (between
3V to 5.5V) to VCC test point.
Connect a DC volt meter (or an oscilloscope) to the
VCOMP port (SMA connector J2) to measure the VCOMP
switch point voltages.
Set VREF to desired reference voltage. (with 10dBm input
power at RFIN, the typical VREF tripped point is 1.23V)
Increase The RF input power level to the point when the
VCOMP output voltage will go to a high level. (typically
VCC – 0.2V)
Optional measurements can be done by increasing VREF
reference level. During the measurements, when VCOMP
is HIGH, connect LEN to VCC. Remove the RF input signal
and the VCOMP will continue to stay high.
Table 3. Gain Mode and Typical VOUTADJ Operation
PIN
DESCRIPTION
REQUIRED VOUTADJ FOR A GIVEN DC OUTPUT
OFFSET
GAIN1
Minimum Gain Setting (VOUT/RFIN ≈ 1.5dB)
VOUTADJ = 0.95 • VOUT – 0.174
VCCA
GAIN2
VOUT/RFIN Increased 6dB
VOUTADJ = (VOUT – 0.07)/2.10
VCCA
GND
GAIN4
VOUT/RFIN Increased 12dB
VOUTADJ = (VOUT + 0.05)/3.16
VCCA
VCCA
GAIN8
VOUT/RFIN Increased 18dB
VOUTADJ = (VOUT + 0.25)/5.26
G1
G0
GAIN MODE
GND
GND
GND
Note: Valid range for VOUT ≈ 0.195V ≤ VOUT ≤ VCC – 1.6
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3
DEMO MANUAL DC1646A
quick start procedure
DC POWER SUPPLY
CH2
CH1
GND
V+
(3V TO 5.5V)
V+
2dB OR 3dB
ATTENUATOR PAD
SYNTHESIZED SIGNAL
GENERATOR
HP83731A
DC VOLT METER
FREQUENCY = 1GHz TO 15GHz
AMPLITUDE = –24dBm TO 16dBm
PIN
LEN
VREF
VP
GO
G1
GAIN
MODE
GND
GND
GAIN1
VCC
GND
GAIN2
GND
VCC
GAIN4
VCC
VCC
GAIN8
DC1646 F02
VCOMP
VOUT
TRANSPARENT
VOUT
LATCHED
VOUT
TRANSPARENT
LTC5564 COMPARATOR LATCH ENABLE FUNCTION
Figure 2. Proper Measurement Equipment Set-Up
dc1646af
4
DEMO MANUAL DC1646A
quick start procedure
Modification of RFIN Port for Other Frequency Ranges
VCC
C2
1000pF
C3
100pF
Z2
(OPT)
J1
RFIN
C7
(OPT)
Z1
0.5pF
VCOMP
C4
10pF
17
16
NC
C5
J2
R4
(OPT)
15
VCCRF
14
VREF
13
VCC
VCOMP
1 RFIN
VCCA
12
2 NC
VCCP
11
3 GND
VOUT
10
C9
10pF
2.2pF
4
GND
NC
LEN
VOUTADJ GAIN0
5
6
7
9
C10
100pF
E12
VCC_OUT
C11
1000pF
R5
(OPT)
R6
VOUT
0 Ohm
U1
LTC5564IUD
C12
(OPT)
J3
R7
(OPT)
GAIN1
8
Impedance Matching Circuits Components and Values at Selected Frequency Ranges
FREQUENCY RANGE(1)
C5
VALUE/PART# (2)
Z1
VALUE/PART# (2)
Z2
VALUE/PART# (2)
1.6GHz to 3.4GHz
100pF/GJM1555C1H101JZ01
6.8nH/0402CS-6N8XGL
No Placement
7GHz to 8.5GHz
0.5pF/GJM1555C1HR50BB01
0.3pF/GJM1555C1HR30BB01
No Placement
8.6GHz to 10.7GHz
0.2pF/GJM1555C1HR20BB01
0.1pF/GJM1555C1HR10BB01
No Placement
11.7GHz to 12.2GHz
10pF/GJM1555C1H100JB01
No Placement
2.2pF/GJM1555C1H2R2CB01
0.5GHz to 1.9GHz and
5.7GHz to 11.3GHz(3)
20pF/GJM1555C1H200JB01
137Ω/RK73H1ETTP1370F
137Ω/RK73H1ETTP1370F
5.2GHz to 6.2GHz and
14.7GHz to 16.5GHz(4)
2.2pF/GJM1555C1H2R2CB01
0.5pF/GJM1555C1HR50BB01
No Placement
(1) The impedance matching networks at stated frequency ranges have 10dB or better return loss.
(2) Capacitors, inductors and resistors are manufacture by MURATA, COILCRAFT or KOA respectively.
(3) Resistive matching has wider frequency ranges at the expense of degraded sensitivity by 6dB to 8dB.
(4) Default DC1646A demo board frequencies ranges.
dc1646af
5
DEMO MANUAL DC1646A
parts list
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
3
C1, C3, C10
CAP, NPO 100pF 25V 10% 0402
AVX 04023A101KAT2A
2
2
C2, C11
CAP, X7R 1000pF 50V 10% 0402
AVX 04025C102KAT2A
3
2
C4, C9
CAP, NPO 10pF 25V 10% 0402
AVX 04023A100KAT2A
4
1
C5
CAP, C0G 2.2pF 50V ±0.25pF 0402
MURATA GJM1555C1H2R2CB01D
5
0
C7, C13 (OPT)
CAP, 0402
6
0
C12 (OPT)
CAP, 0603
7
1
C14
CAP, TANT 2.2µF 20V 20% 3216
AVX TPSA225M020R3000
8
9
E1, E2, E5, E7, E8, E9,
E10, E11, E12
TURRET, TESTPOINT 0.063”
MILL MAX 2308-2-00-80-00-00-07-0
E. F. JOHNSON 142-0701-851
9
3
J1, J2, J3
CONN, SMA 50Ω
10
0
R1 to R5, R7, R9, R12
(OPT)
RES, 0603
11
1
R6
RES/JUMPER, CHIP 0Ω 1/16W 1A 0603
VISHAY CRCW06030000Z0EA
12
3
R8, R10, R11
RES, CHIP 10K 0.06W 5% 0603
VISHAY CRCW060310K0JNEA
13
1
U1
I.C., PRECISION RF PWR DET QFN(16)(UD)3mm × 3mm
LINEAR TECHNOLOGY CORP LTC5564IUD
14
1
Z1
CAP, C0G 0.50pF 50V ±0.1pF 0402
MURATA GJM1555C1HR50BB01D
Z2 (OPT)
RES, 0402
15
0
16
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1646A
17
1
STENCIL
STENCIL 1646A
dc1646af
6
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
2
3
4
E8
E2
E1
J1
+
VCC
C14
2.2uF
C7
(OPT)
Z1
0.5pF
Z2
(OPT)
2.2pF
C5
B
A
B
0402CS-6N8XGL
GJM1555C1HR50BB01
GJM1555C1HR30BB01
GJM1555C1HR10BB01
NO PLACEMENT
GJM1555C1HR50BB01
6.8nH
0.5pF
0.3pF
0.1pF
0.5pF
GJM1555C1H101JZ01
GJM1555C1H2R2CB01
GJM1555C1HR50BB01
GJM1555C1HR20BB01
GJM1555C1H100JB01
GJM1555C1H2R2CB01
100pF
2.2pF
0.5pF
0.2pF
10pF
2.2pF
Z1
MANUFACTURE #
VALUE
C5
MANUFACTURE #
VALUE
NOTE: CAPACITORS ARE MANUFACTURED BY MURATA;
INDUCTORS ARE MANUFACTURED BY COILCRAFT.
1.7GHz to 3.1GHz
5.1 to 6.1 GHz
7.0 to 8.5 GHz
8.3 to 10.2 GHz
11.9 to 12.2 GHz
14.9 to 16.5 GHz
FREQUENCY RANGE
2.2pF
VALUE
R8
10K
C2
1000pF
LTC5564 MATCHING CIRCUITS COMPONENTS AND VALUES.
LEN
GND
VCC
RFIN
A
Z2
R12
(OPT)
R9
(OPT)
VCC
5
LEN
GND
14
VREF
6
NO PLACEMENT
NO PLACEMENT
NO PLACEMENT
NO PLACEMENT
GJM1555C1H2R2CB01
NO PLACEMENT
C13
(OPT)
7
13
R11
10K
9
C10
100pF
C
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
John C.
APP ENG.
D
SCALE = NONE
RB
DATE:
N/A
SIZE
GAIN0
GAIN1
GND
VOUT
Monday, January 10, 2011
E
SHEET 1
4
OF 1
REV.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
E
15GHz RF DETECTOR
TECHNOLOGY
E9
E7
E5
J3
LTC5564IUD
DEMO CIRCUIT 1646A
IC NO.
VCOMP
E12
VCC_OUT
J2
E11
VCC_COMP
E10
VREF
TITLE: SCHEMATIC
R7
(OPT)
R5
(OPT)
APPROVALS
C12
(OPT)
0 Ohm
R6
D
PCB DES.
C11
1000pF
VCC
U1
LTC5564IUD
C9
10pF
CUSTOMER NOTICE
10
11
R4
(OPT)
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
8
GAIN1
NC
VOUT
VCCP
VCCA
12
R3
(OPT)
R2
(OPT)
VCOMP
R10
10K
VOUTADJ GAIN0
MANUFACTURE #
4
3 GND
2 NC
15
VCCRF
C4
10pF
16
NC
1 RFIN
17
C3
100pF
VCC
C1
100pF
R1
(OPT)
VCC
C
1
2
3
4
DEMO MANUAL DC1646A
Schematic Diagram
dc1646af
7
DEMO MANUAL DC1646A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc1646af
8
Linear Technology Corporation
LT 0311 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
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