Products and Services
700 – 1000 MHz High Gain and Linearity
Source:
Skyworks Solutions, Inc.
The SKY73022-11 is a fully integrated diversity mixer that
includes Local Oscillator (LO) drivers, an LO switch, high linearity
mixers, and large dynamic range Intermediate Frequency (IF)
amplifiers. Low loss RF baluns have also been included to reduce
design complications and lower system cost.
The SKY73022-11 features an input IP3 of +25.3 dBm and a
Noise Figure (NF) of 9.0 dB, making the device an ideal solution
for high dynamic range systems such as 2G/3G base station
receivers. The LO switch provides more than 53 dB of isolation
between LO inputs and supports the switching time required for
GSM/EDGE base stations.
The SKY73022-11 is manufactured using a robust silicon BiCMOS
process and has been designed for optimum long-term reliability.
The SKY73022-11 diversity downconversion mixer is provided in
a compact, 36-pin 6 x 6 mm Multi-Chip Module (MCM).
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 Ù 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 3rd
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 ±6 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 53 dB of LO1 to LO2 isolation:
LO_SEL Input LO Path Selected
High LO1 (pin 19) enabled
Low 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 Ù 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.
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