Menlo Micro: Update on models for simulation with MM5130
As an additional tool to support customers who are interested in designing systems with MM5130,Menlo Micro have released a more refined set of models, which have been correlated to our measurements.
The document below has a summary of those models and has been placed in the SharePoint folders under “Products—>MM5130”. www.menlomicro.com
Let us know if you have any questions.
MM5130 Equivalent Circuit Device Models
Lumped Element Model
The lumped element model consists of a pure RLC equivalent circuit and gives good correlation with the measured S-Parameters up to 12 GHz. The switch elements have an associated On-resistance and Offstate switch capacitance. All other circuit elements consist of finite Q-factor inductors and ideal capacitors. The loss of the inductors is modelled as a large parallel resistor rather than small series resistor as this gives a better approximation to the dielectric substrate losses. The four arms of the model are identical. The lumped element model is valid for DC applications and is configured as two series switches with the contact sides facing outward. Note the resistor to ground at the midpoint between the switches. This resistor ensures that this node is tied to ground potential.
Transmission Line Model/Distributed Model
The transmission line model consists of two series switch elements per arm with associated ON resistance and parallel capacitance. The resistive loss is the key contributor to insertion loss at low frequencies (<2 GHz). The parallel capacitance is the limiting factor on switch isolation and comes into effect at higher frequencies. At frequencies above 2 GHz, the losses associated with the dielectric substrates of the switch package and the resistance of the metallization of the feed lines becomes the dominant factor. The model assumes a simple microstrip line with the physical length and dielectric constant adjusted accordingly giving good correlation with measured data up to 18 GHz, not the actual properties of the material used in the device. The four switch arms are identical based on the physical symmetry of the MM5130 design. This model is not accurate for DC applications.
Comparison to Measured S-parameter Data
The lumped element model shows good alignment with measured data up to about 12 GHz. The distributed transmission line model shows alignment up to 18 GHz. In addition to above models there is also measured s-parameter data for On and Off states available for use in simulations.
Click here to download MM5130 Device Models