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700 – 1000 MHz High Gain and Linearity Single
Skyworks Solutions, Inc.
The SKY73070 is a fully integrated single mixer that includes a
Local Oscillator (LO) driver, high linearity mixer, and large
dynamic range Intermediate Frequency (IF) amplifier. A low loss
RF balun has also been included to reduce design complications
and lower system cost.
The SKY73070 features an input IP3 of +27.0 dBm and a Noise
Figure (NF) of 8.3 dB, making the device an ideal solution for high
dynamic range systems such as 2G/3G base station transceivers.
The SKY73070 is manufactured using a robust silicon BiCMOS
process and has been designed for optimum long-term reliability.
The SKY73070 single downconversion mixer is provided in a
compact, 20-pin 5 x 5 mm Multi-Chip Module (MCM)..
The SKY73070 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 SKY73070 to
connect directly to the output of a Voltage Controlled Oscillator
(VCO). This eliminates the extra gain stages needed by most
discrete passive mixers.
RF Balun and Passive Mixer
The RF balun provides a single ended input, which can easily be
matched to 50 Ù using a simple external matching circuit. The RF
balun offers very low loss, and excellent amplitude and phase
balance.
The high linearity SKY73070 is a passive, double balanced mixer
that provides a very low conversion loss, and excellent 3rd Order
Input Insertion Point (IIP3).
Additionally, the balanced nature of the mixer provides for high
port-to-port isolation.
LO Buffer
An LO buffer allows the input power of the SKY73070 to be in the
range of ±6 dBm. The LO section is optimized for high-side LO
injection. However, the LO can be driven over a wide frequency
range with only slight degradation in performance.
IF Amplifier
The SKY73070 includes a high dynamic range IF amplifier that
follows the passive mixer 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 amplifier is optimized for
IF frequencies between 40 and 300 MHz. The IF amplifier can be
operated outside of this range, but with a slight degradation in
performance.
