Products and Services
400-1000 MHz High Dynamic Range Active Mixer
Source:
Skyworks Solutions, Inc.
The SKY42068 is an integrated, high-dynamic range low-noise
receiver down converter. It includes a double-balanced active
mixer, Local Oscillator (LO) amplifiers, and dual LO inputs
selected by an external switch interface. The LO switch function is
managed using an externally controlled CMOS-compatible
interface.
Functional Description
The SKY42068 consists of a high dynamic active mixer, LO
amplifiers, and a selectable LO input. The SKY42068 was
specifically designed to meet the needs of high performance
receivers.
The mixer shares two independent LO signals, LO_1 and LO_2,
that are selected using a common CMOS-compatible control
signal. With this ability, the device can be used in applications
where frequency hopping is required.
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
described in Table 1. The absolute maximum ratings of the
SKY42068 are provided in Table 2. The recommended operating
conditions are specified in Table 3 and elec
Evaluation Board Description
The SKY42068 Evaluation Board is used to test the SKY42068
mixer performance. The SKY42068 Evaluation Board schematic
diagram is shown in Figure 3. Figure 4 displays the Evaluation
Board layout. The Bill of Materials (BOM) is provided in Table 5.
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 as possible.
2. The ground pad of the SKY42068 mixer has special electrical
and thermal grounding requirements. 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 mixer. As such, design the connection to the ground
pad to dissipate the maximum wattage produced to the circuit
board. Multiple vias to the grounding layer are required.
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