SKY42068 Datasheet, PDF (3/8 Pages) Skyworks Solutions Inc. – 400-1000 MHz High Dynamic Range Active Mixer

PRELIMINARY DATA SHEET • SKY42068 ACTIVE MIXER
Table 4. SKY42068 Electrical Specifications
(voltage supply = +5 V, TC = +25 °C, LO = 0 dBm, RF frequency = 900 MHz, IF frequency = 71 MHz, unless otherwise noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
RF
RF input frequency
RF input VSWR (Note 1)
400
1000
1.5:1
2.0:1
Mixer (Note 2)
Conversion gain
2.5
Single side band noise figure
Input IP3
RF to IF leakage (Note 3)
9.5
1 MHz tone spacing
36
–40
LO to IF leakage
Input –1 dB compression point
2x2 product suppression (Note 4)
–25
+14
+17
–70
Local Oscillator
LO input frequency (Note 5)
LO input VSWR (Note 1)
450
1200
1.5:1
2.0:1
LO level input
LO1 to LO2 isolation
–5
0
+5
40
Intermediate Frequency
IF output frequency
50
IF output VSWR (Note 1)
IF = 50 MHz to 200 MHz
Note 1: In a 50 Ω system obtained with external matching components on input/output ports.
Note 2: Include RF balun and IF transformer losses.
Note 3: Measured with an RF input power of –10 dBm.
Note 4: Measured with an RF input power of –16 dBm.
Note 5: Use high side LO injection for RF frequencies below 500 MHz.
250
1.5:1
2.0:1
Units
MHz
dB
dB
dBm
dBm
dBm
dBm
dBc
MHz
dBm
dB
MHz
Evaluation Board Description
The SKY42068 Evaluation Board is used to test the SKY42068
mixer performance. The SKY42068 Evaluation Board schematic
diagram is shown in Figure 3. Figure 4 displays the Evaluation
Board layout. The Bill of Materials (BOM) is provided in Table 5.
Circuit Design Configurations
The following design considerations are general in nature and
must be followed regardless of final use or configuration:
1. Paths to ground should be made as short as possible.
2. The ground pad of the SKY42068 mixer has special electrical
and thermal grounding requirements. This pad is the main
thermal conduit for heat dissipation. Since the circuit board
acts as the heat sink, it must shunt as much heat as possible
from the mixer. As such, design the connection to the ground
pad to dissipate the maximum wattage produced to the circuit
board. Multiple vias to the grounding layer are required.
3. Two external output bypass capacitors are required on the VDD
pin. The values of these capacitors will change with respect to
the desired RF frequency. One capacitor should be used for
low frequency bypassing and the other capacitor for high
frequency bypassing. Special attention should be given so that
the smaller value capacitor does not go into self-resonance at
the desired RF frequency.
4. The RF input must be driven differentially. A 1:1 impedance
ratio balun is recommended with a center tap on the secondary
side that is a DC path to ground.
Mixer Testing Procedure
Use the following procedure to set up the SKY42068 Evaluation
Board for mixer testing. Refer to Figure 5 for guidance:
1. Connect the SKY42068 Evaluation Board (J1) to a +5 VDC
power supply using insulated supply cables. If available,
enable the current limiting function of the power supply to
250 mA.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
103210C • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • August 23, 2006
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