SKY73022-11 Datasheet, PDF (3/12 Pages) Skyworks Solutions Inc. – 700 - 1000 MHz High Gain and Linearity Diversity Downconversion Mixer for 2G/3G Base Station Applications

PRELIMINARY DATA SHEET • SKY73022-11 DOWNCONVERSION MIXER
Functional Description
The SKY73022-11 is a high gain diversity mixer, optimized for
base station receiver applications. The device consists of two
diversity channels (A and B), each consisting of a low loss RF
balun, high linearity passive mixer, and a low noise IF amplifier.
Two LO amplifiers (independent of channels A and B) are also
included that allow the SKY73022-11 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 for frequency hopping
applications (i.e., 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 SKY73022-11 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 SKY73022-11 to be in
the range of ±3 dBm. The LO section is optimized for high-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 SKY73022-11 to be used
for frequency hopping applications. This switch provides greater
than 55 dB of LO1 to LO2 isolation:
LO_SEL Input
High
Low
LO Path Selected
LO1 (pin 19) enabled
LO2 (pin 27) 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 SKY73022-11 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 SKY73022-11 are provided
in Table 2 and the recommended operating conditions in Table 3.
Electrical characteristics for the SKY73022-11 are provided in
Table 4.
Table 2. SKY73022-11 Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
Supply voltage, +5 V (VCC1 – VCC7)
VCC
4.5
5.5
V
Supply current
ICC
420
mA
RF input power
PRF
20
dBm
LO input power
PLO
20
dBm
Operating case temperature
TC
–40
+85
°C
Junction temperature
TJ
150
°C
Storage case temperature
TSTG
–40
+125
°C
Notes: 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
parameters set at or below their nominal value.
Nominal thermal resistance (junction to center ground pad) is 5.1 °C/W.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200518C • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • August 16, 2007
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