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MQS-0518SM
MMIC 5-18GHz 90° Splitter / Combiner
The MQS-0518SM is a MMIC 5 GHz – 18 GHz 90° splitter/combiner. Passive GaAs MMIC technology allows production of smaller constructions that replace larger form factor circuit board constructions. Low variation allows for accurate simulations using the provided S4P file taken from measured production units. Tight fabrication tolerances allow for less unit to unit variation than traditional splitter/combiner technologies. The MQS-0518SM is available as 4X4 mm QFN Package. Evaluation boards are also available.
| Parameter | Typ | Unit |
|---|---|---|
| Frequency Range | 5 to 18 | GHz |
| Isolation | 17 | dB |
| Nominal Phase Shift | 90 | ° |
| Phase Balance | 2.5 | ° |
| 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 | Green Status | Product Lifecycle | Export Classification |
|---|---|---|---|---|---|
| MQS-0518SM | MMIC 5-18GHz 90° Splitter / Combiner | QFN | REACH RoHS | Released | EAR99 |
| EVAL-MQS-0518 | Evaluation Board, MMIC 5-18GHz 90° Splitter / Combiner | EVAL | REACH RoHS | Released | EAR99 |
All measured data is de-embedded using AFR.
All measured data is taken from the eval board without de-embedding of the connectors and traces. 6 Ports 1 – 4 correspond to the Evaluation board package designation.
All measured data is taken from the eval board without de-embedding of the connectors and traces.All measurements taken in a 50Ω environment.
All measured data is taken from the eval board without de-embedding of the connectors and traces. 6 Ports 1 – 4 correspond to the Evaluation board package designation.
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 | - | - | 5 | 18 | - | - | - | GHz |
| Amplitude Balance 1 | A | - | 5 | 18 | - | 0.5 | 2.5 | dB |
| Excess Insertion Loss 2 | A | - | 5 | 18 | - | 4.5 | 6 | dB |
| Impedance | A | - | 5 | 18 | - | 50 | - | Ω |
| Isolation 3 | A | - | 5 | 18 | 10 | 17 | - | dB |
| Mean Coupling 4 | A | - | 5 | 18 | - | 3 | - | dB |
| Nominal Phase Shift 5 | A | - | 5 | 18 | - | 90 | - | ° |
| Phase Balance | A | - | 5 | 18 | - | 2.5 | 10 | ° |
| VSWR 6 | A | - | 5 | 18 | - | 1.2 | - | - |
[1][3][4][5][6] Device is non-reciprocal. Operation not guaranteed when ports 3 or 4 are used as an input.
[2] Device is non-reciprocal. Operation not guaranteed when ports 3 or 4 are used as an input. Excess Insertion Loss = (Input Port to Common Port Insertion Loss) – 3 dB.
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 |
| RF Power Handling | 10 | W |
| Parameter | Details | Rating |
|---|---|---|
| Dimensions | - | 4 x 4 mm |
| Moisture Sensitivity Level | - | MSL 1 |
A bottom-up view of the MQS-0518SM’s SM package outline drawing is shown below. Only Pins 5 and 11 may be used as an input. Pins 1 and 15 are not recommended as inputs. Device is not recommended for applications requiring reflected signals.
| Port | Function | Description | DC Equivalent Circuit |
|---|---|---|---|
| Pin 1 | Isolated | Pin 1 is DC short to pin 11 and open to ground. |  |
| Pin 11 | 90° Output | Pin 11 is DC short to pin 1 and open to ground. | |
| Pin 15 | 0° Output | Pin 15 is DC short to pin 5 and open to ground. | |
| Pin 5 | Input | Pin 5 is DC short to pin 15 and open to ground. | |
| Port | Function | Description | DC Equivalent Circuit |
|---|---|---|---|
| Pin 1 | 0° Output | Pin 1 is DC short to pin 11 and open to ground. | |
| Pin 11 | Input | Pin 11 is DC short to pin 1 and open to ground. | |
| Pin 15 | Isolated | Pin 15 is DC short to pin 5 and open to ground. | |
| Pin 5 | 90° Output | Pin 5 is DC short to pin 15 and open to ground. | |
Quadrature signal generation is useful for many applications in analog signal processing. Marki MQH (MMIC quadrature hybrids) and MQS (MMIC 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 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.
Download : Outline 2D Drawing Outline 3D Drawing Outline 3D STP
Download : Footprint Drawing
| Revision Code | Revision Date | Comment |
|---|---|---|
| - | 2020-06-01 | Initial Datasheet Release |
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