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MQS-0209CH
MMIC 2-9GHz 90° Splitter / Combiner
The MQS-0209 is a MMIC 2GHz – 9GHz 90° splitter/combiner. Wire bondable 50Ω terminations are available on-chip. Passive GaAs MMIC technology allows production of smaller constructions that replace larger form factor circuit board constructions. Tight fabrication tolerances allow for less unit to unit variation than traditional splitter/combiner technologies. The MQS-0209 is available as a wire bondable chip or connectorized module. Low variation allows for accurate simulations using the provided S4P file taken from measured production units.
| Parameter | Typ | Unit |
|---|---|---|
| Frequency Range | 2 to 9 | GHz |
| Isolation | 16 | dB |
| Nominal Phase Shift | 90 | ° |
| Phase Balance | 3 | ° |
| Amplitude Balance | 0.5 | dB |
Summary only – refer to the Electrical Specifications, Absolute Maximum Ratings, and Recommended Operating Range tables for complete details.
| Part Number | Description | Package | Connectors | Green Status | Product Lifecycle | Export Classification |
|---|---|---|---|---|---|---|
| MQS-0209UB | MMIC 2-9GHz 90° Splitter / Combiner | UB | Standard | REACH RoHS | Released | EAR99 |
| MQS-0209CH | MMIC 2-9GHz 90° Splitter / Combiner | CH | - | REACH RoHS | Released | EAR99 |
All measurements taken in a 50Ω environment. On-chip load was not used when taking measurements.
All measurements taken in a 50Ω environment. On-chip load was not used when taking measurements.
The electrical specifications apply at Tau=+25°C in a 50Ω system. Min and Max limits are guaranteed at Tau=+25°C.
| Parameter | Port Configuration | Test Conditions | Minimum Frequency (GHz) | Maximum Frequency (GHz) | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|---|---|
| Frequency Range | - | - | 2 | 9 | - | - | - | GHz |
| Amplitude Balance | A | - | 2 | 9 | - | 0.5 | 2 | dB |
| Excess Insertion Loss | A | - | 2 | 9 | - | 2 | 4.5 | dB |
| Impedance | A | - | 2 | 9 | - | 50 | - | Ω |
| Isolation | A | - | 2 | 9 | 9 | 16 | - | dB |
| Mean Coupling | A | - | 2 | 9 | - | 3 | - | dB |
| Nominal Phase Shift | A | - | 2 | 9 | - | 90 | - | ° |
| Phase Balance | A | - | 2 | 9 | - | 3 | 15 | ° |
| VSWR | A | - | 2 | 9 | - | 1.1 | - | - |
Device is non-reciprocal. Operation not guaranteed when ports 3 or 4 are used as an input.
The Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. If these limits are exceeded, the device may be inoperable or have a reduced lifetime.
| Parameter | Maximum Rating | Unit |
|---|---|---|
| Maximum Operating Temperature | 100 | °C |
| Maximum Storage Temperature | 125 | °C |
| Minimum Operating Temperature | -55 | °C |
| Minimum Storage Temperature | -65 | °C |
| Parameter | Details | Rating |
|---|---|---|
| Dimensions | - | 3.75 x 2.50 mm |
A top-down view of the MQS-0209CH package outline drawing is shown below. Only ports 1 and 2 may be used as an input. Ports 3 and 4 are not recommended as inputs. Device is not recommended for applications requiring reflected signals. Ports 1 – 4 correspond to the UB package designation.
| Port | Function | Description | DC Equivalent Circuit |
|---|---|---|---|
| Pad | Ground | CH package ground path is provided through the substrate and ground bond pads. |  |
| Pad 1 | Input | Port 1 is DC short to port 3 and open to ground. |  |
| Pad 2 | 90° Output | Port 2 is DC short to port 4 and open to ground. | |
| Pad 3 | 0° Output | Port 3 is DC short to port 1 and open to ground. | |
| Pad 4 | Isolated | Port 4 is DC short to port 2 and open to ground. | |
| Port | Function | Description | DC Equivalent Circuit |
|---|---|---|---|
| Pad | Ground | CH package ground path is provided through the substrate and ground bond pads. | |
| Pad 1 | 90° Output | Port 1 is DC short to port 3 and open to ground. | |
| Pad 2 | Input | Port 2 is DC short to port 4 and open to ground. | |
| Pad 3 | Isolated | Port 3 is DC short to port 1 and open to ground. | |
| Pad 4 | 0° Output | Port 4 is DC short to port 2 and open to ground. | |
Quadrature signal generation is useful for many applications in analog signal processing. Marki MQH/S MMIC quadrature hybrids and 90˚ Splitter/Combiners offer this functionality in a small factor with high repeatability. Below are applications and how they can be realized with the MQH and MQS product lines.
Quadrature Hybrids vs 90˚ Splitter/Combiners
Some products are ‘true’ quadrature hybrids, while others are 90˚ Splitter/Combiners. A quadrature hybrid is symmetric about all four ports, meaning that in a splitting application any port can be used as an input, with the isolated and output ports following from this selection. Likewise, for a combining application, any port can be used as an output.
A 90˚ Splitter/Combiner is not symmetric. When splitting, only ports 1 and 2 can be used as an input. If ports 3 or 4 were used, there would be significant phase walk-off between the output ports. As a combiner, only ports 1 and 2 are suitable as output ports. The phase walk-off introduced when using ports 3 or 4 as an output means that reflected signals recombine and cancel poorly inside a 90° Splitter/Combiner.
Single Sideband and Image Reject Mixers
The primary application for the MQH and MQS series is as IF or LO quadrature signal splitter/combiners. They can be used in combination with the MMIQ series of IQ mixers to create broadband single sideband and image reject mixers. Either 90˚ Splitter/Combiners or quadrature hybrids can be used as the IF hybrid, but if a 90˚ Splitter/Combiner is used only one sideband (or image) is accessible, whereas if a quadrature hybrid is used than both sidebands are accessible.
If a 90˚ Splitter/Combiner is used for a single sideband upconverter or image reject mixer, port 1 (or 2) should be used as the IF input/output and ports 2 and 3 (or 1 and 4) should be connected to the I and Q ports. Selecting port 1 or 2 to terminate will select which sideband of the mixer to reject.
Balanced Amplifiers
In a balanced amplifier, the poor return loss of an amplifier is compensated for with a quadrature hybrid. In this application, the reflections from the input or output are collected at the isolated port of the quadrature hybrid and terminated.
Since a 90˚ Splitter/Combiner is not completely symmetric, reflected signals will not terminate as well as with a quadrature hybrid. An MQH option is recommended for this application. If a 90˚ Splitter/Combiner is used for a single sideband upconverter or image reject mixer, port 1 (or 2) should be used as the IF input/output and ports 2 and 3 (or 1 and 4) should be connected to the I and Q ports. Selecting port 1 or 2 to terminate will select which sideband of the mixer to reject. Testing/simulation is recommended when considering if a 90° Splitter/Combiner is suitable.
Reflectionless Filter
Similar to a balanced amplifier, a reflectionless filter will terminate reflections that are out of band for a filter (but in band for the quadrature hybrid) at the isolated port.
Since a 90˚ Splitter/Combiner is not completely symmetric, reflected signals will not terminate as well as with a quadrature hybrid. An MQH option is recommended for this application. If a 90˚ Splitter/Combiner is used for a single sideband upconverter or image reject mixer, port 1 (or 2) should be used as the IF input/output and ports 2 and 3 (or 1 and 4) should be connected to the I and Q ports. Selecting port 1 or 2 to terminate will select which sideband of the mixer to reject. Testing/simulation is recommended when considering if a 90° Splitter/Combiner is suitable.
Reflective Applications
Unlike in the previous applications, reflective applications only work well with a quadrature hybrid (not a 90˚ Splitter/Combiner). In these applications a signal is reflected off of two identical structures (typically a PIN diode) and the output signal is collected at the isolated port. In this case the desired signal is deliberately reflected.
Since a 90˚ Splitter/Combiner is not completely symmetric, you will have poor results if you use these for reflective applications.
Marki MMICs should be attached directly to a ground plane with conductive epoxy. The ground plane electrical impedance should be as low as practically possible. This will prevent resonances and permit the best possible electrical performance. Datasheet performance is only guaranteed in an environment with a low electrical impedance ground.
Mounting - To epoxy the chip, apply a minimum amount of conductive epoxy to the mounting surface so that a thin epoxy fillet is observed around the perimeter of the chip. Cure epoxy according to manufacturer instructions.
Wire Bonding - Ball or wedge bond with 0.025 mm (1 mil) diameter pure gold wire. Thermosonic wirebonding with a nominal stage temperature of 150 °C and a ball bonding force of 40 to 50 grams or wedge bonding force of 18 to 22 grams is recommended. Use the minimum level of ultrasonic energy to achieve reliable wirebonds. Wirebonds should be started on the chip and terminated on the package or substrate.
Circuit Considerations – 50 Ω transmission lines should be used for all high frequency connections in and out of the chip. In circumstances where the chip more than .001” thinner than the substrate, a heat spreading spacer tab is optional to further reduce bondwire length and parasitic inductance.
Special Considerations for 90° Splitters – Transitions between the chip and transmission line should be as close to 50 Ω as possible. Small impedance mismatches will result in poor phase balance mid-band due to reflections. Length and number of wire bonds should be adjusted to tune inductance for an optimal 50 Ω match. In the modules, chip transitions are optimized for broadband performance.
General Handling
Chips should be handled with care using tweezers or a vacuum collet. Users should take precautions to protect chips from direct human contact that can deposit contaminants, like perspiration and skin oils on any of the chip's surfaces.
Cleaning and Storage: Do not attempt to clean the chip with a liquid cleaning system or expose the bare chips to liquid. Once the ESD sensitive bags the chips are stored in are opened, chips should be stored in a dry nitrogen atmosphere.
Four Port Device
Isolated Port Terminated
Download : Outline 2D Drawing
| Revision Code | Revision Date | Comment |
|---|---|---|
| - | 2018-08-01 | Datasheet Initial Release |
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