LCLowpassMatch (Lowpass Match)

Symbol

Summary

A lowpass matching network provides a lowpass frequency response between the input (pin 1) and output (pin 2) ports. The source or load terminations can be specified using either a lumped component approximation, a frequency independent complex impedance, or a Touchstone format S-parameter file. Analytic and Real Frequency synthesis methods are both possible. The network order (N) is approximate due to potential component absorption.

Parameters

Name	Description	Unit	Default
Fp	Frequency at passband edge	GHz	1
SynthesisType	Synthesis procedure, Analytic or Real Frequency	None	Analytic
GainChange	Linear gain change over passband (can be negative)	dB	0
N	Network order	None	3
SourceType	Type of source impedance	None	Resistive
Rg	Source resistance	Ohms	50
Lg	Source inductance	nH	1
Cg	Source capacitance	pF	1
Zg	Source impedance	Ohms	50+j×50
SourceFile	Source S-parameter file name	None	ZSource.s1p
SourceFileSparm	Source S-parameter	None	"S(1,1)"
SourceImpType	Complex source impedance interpretation	None	Source Impedance
LoadType	Type of load impedance	None	Series RL
RL	Load resistance	Ohms	50
LL	Load inductance	nH	1
CL	Load capacitance	pF	1
ZL	Load impedance	Ohms	100-j*100
LoadFile	Load S-parameter file name	None	ZLoad.s1p
LoadFileSparm	Load S-parameter	None	"S(1,1)"
LoadImpType	Complex load impedance interpretation	None	Load Impedance

Palette

Filter DG - All Networks

Available Automated-Assistants

Matching Assistant, Simulation Assistant, Yield Assistant, Display Assistant

Matching Assistant Usage

For general information, refer to Matching Assistant. When representing the source and/or load using lumped components only lowpass type networks are allowed. Arbitrary terminations can be implemented using S-parameter files. However, if the specified termination impedance is not of lowpass form, the resulting matching network response approximates a lowpass form but typically rolls off at the low end of the band.

Simulation Assistant Usage

For general information, refer to Simulation Assistant.

Yield Assistant Usage

For general information, refer to Yield Assistant.

Display Assistant Usage

For general information, refer to Display Assistant.

Example

A lowpass matching network (N=3) was designed for 1 GHz with a resistive source termination (Rg=50 Ohms) and a Series RL load termination (RL=50 Ohms, LL=1 nH). The match is realized using two reactive components, since the load inductance is absorbed by the designed network.