SKY73032-11_09 Datasheet, PDF (3/14 Pages) Skyworks Solutions Inc. – 700 – 1000 MHz High Gain and Linearity Single Downconversion Mixer

DATA SHEET • SKY73032-11 DOWNCONVERSION MIXER
Functional Description
The SKY73032-11 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 SKY73032-11 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 (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 : using a simple external matching circuit. The RF
baluns offer very low loss, and excellent amplitude and phase
balance.
The high linearity SKY73032-11 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 SKY73032-11 to be in
the range of r6 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 SKY73032-11 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 SKY73032-11 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 : 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 SKY73032-11 are provided
in Table 2 and the recommended operating conditions in Table 3.
Electrical characteristics for the SKY73032-11 are provided in
Table 4.
Typical performance characteristics for the SKY73032-11 are
illustrated in Figures 3 through 19.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200625E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 24. 2009
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