200635A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • February 15, 2007
1
PRELIMINARY DATA SHEET • SKY73033 DOWNCONVERSION MIXER
February 15, 2007 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 200635A
PRELIMINARY DATA SHEET • SKY73033 DOWNCONVERSION MIXER
Functional Description
The SKY73033 is a high gain single mixer, optimized for base
station receiver applications. The device consists of a low loss RF
balun, high linearity passive mixer, and a low noise IF amplifier.
An LO amplifier is also included that allow the SKY73033 to
connect directly to the output of a Voltage Controlled Oscillator
(VCO). This eliminates the extra gain stages needed by most
discrete passive mixers. A Single Pole, Double Throw (SPDT)
switch has been included to select between two different LO
inputs (LO1 and LO2) for frequency hopping applications such as
GSM.
RF Baluns and Passive Mixer
The RF baluns provide a single ended input, which can easily be
matched to 50
Ω
using a simple external matching circuit. The RF
baluns offer very low loss, and excellent amplitude and phase
balance.
The high linearity SKY73033 is a passive, double balanced mixer
that provides a very low conversion loss, and excellent 3
rd
Order
Input Insertion Point (IIP3).
Addtionally, the balanced nature of the mixer provides for high
port-to-port isolation.
LO Buffers and SPDT LO Switch
The LO buffers allow the input power of the SKY73033 to be in
the range of
±3
dBm. The LO section is optimized for low-side LO
injection. However, each of the two LOs can be driven over a wide
frequency range with only slight degradation in performance.
A high isolation SPDT switch allows the SKY73033 to be used for
frequency hopping applications. This switch provides greater than
40 dB of LO1 to LO2 isolation:
LO_SEL Input
High
Low
LO Path Selected
LO1 (pin 11) enabled
LO2 (pin 15) enabled
For applications that do not require frequency hopping, LO_SEL is
fixed to one state and the appropriate LO input is used. An internal
pull-down resistor enables the LO2 input.
IF Amplifier
The SKY73033 includes high dynamic range IF amplifiers that
follow the passive mixers in the signal path. The outputs require a
supply voltage connection using inductive chokes. These choke
inductors should be high-Q and have the ability to handle 200 mA
or greater.
A simple matching network allows the output ports to be matched
to a balanced 200
Ω
impedance. The IF amplifiers are optimized
for IF frequencies between 40 and 300 MHz. The IF amplifiers can
be operated outside of this range, but with a slight degradation in
performance.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY73033 are provided in
Table 2 and the recommended operating conditions in Table 3.
Electrical characteristics for the SKY73033 are provided in
Table 4.
Table 2. SKY73033 Absolute Maximum Ratings
Parameter
Supply voltage, +5 V
Supply current
RF input power
LO input power
Operating case temperature
Storage case temperature
VCC
I
CC
P
RF
P
LO
T
C
T
STG
–40
–40
0
Symbol
Minimum
4.5
Typical
5.0
200
Maximum
5.5
*** TBD ***
20
6
+85
+125
Units
V
mA
dBm
dBm
°C
°C
Note:
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
200635A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • February 15, 2007
3
PRELIMINARY DATA SHEET • SKY73033 DOWNCONVERSION MIXER
The SKY73033 has been optimized for low side LO injection. However, the LO can be used outside of the specified frequency range with degraded performance.
Table 4. SKY73033 Electrical Specifications (1 of 2)
(Voltage Supply = +5 V, T
C
= +25
°C,
LO = 0 dBm, RF Frequency = 1800 MHz, IF Frequency = 200 MHz, LO Frequency = 1680 MHz, Unless
February 15, 2007 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 200635A
PRELIMINARY DATA SHEET • SKY73033 DOWNCONVERSION MIXER
Table 4. SKY73033 Electrical Specifications (2 of 2)
(Voltage Supply = +5 V, T
C
= +25
°C,
LO = 0 dBm, RF Frequency = 1880 MHz, IF Frequency = 200 MHz, LO Frequency = 1680 MHz, Unless
Otherwise Noted)
Parameter
RF port input return loss
LO port input return loss
IF port input return loss
Symbol
Z
IN
_
RF
Z
IN
_
LO
Z
OUT
_
IF
Test Condition
With external matching
components
With external matching
components
With external matching
components
Min
–14
–14
–14
Typical
Max
Units
dB
dB
dB
Evaluation Board Description
The SKY73033 Evaluation Board is used to test the performance
of the SKY73033 downconversion mixer. An assembly drawing for
the Evaluation Board is shown in Figure 3 and the layer detail is
provided in Figure 4.
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 and as low
impedance as possible.
2. The ground pad of the SKY73033 provides critical electrical
and thermal functionality. 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 device. Therefore, design the connection to the ground
pad to dissipate the maximum heat produced by the circuit
board. For more information on soldering the SKY73033, refer
to the Package and Handling Information section of this Data
Sheet.
3. Skyworks recommends including external bypass capacitors
on the VCC voltage inputs of the device.
4. Components L3 and L4 (see Figure 5) are high-Q, low loss
inductors. These inductors must be able to pass currents in
excess of 200 mA DC.
5. Components R7 and R8 (see Figure 5) allow for external
adjustment of the IF amplifier bias points. For operation as
specified in Tables 3 and 4, these resistors are not required.
A schematic diagram for the SKY73033 Evaluation Board is
200635A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • February 15, 2007
模拟与混合信号
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
