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attenuator Class Reference

An ideal attenuator including Johnson noise. More...

#include <attenuator.h>

Inheritance diagram for attenuator::

List of all members.

Public Methods
	attenuator (double a=3.0)
	Default constructor creates a 3 dB attenuator. More...
	attenuator (const abstract_real_parameter *a)
	Construct a shadowed parameter attenuator. More...
int	size ()
	Attenuators are 2 port devices. More...
const nport::data_info&	get_data_info ()
	Attenuators are "active" noise sources if not at device::T. More...
Public Attributes
parameter	dB
	Attenuation in dB; impedance is given by device::Z0. More...
parameter	Temp
	Temperature in standard units. More...
Private Methods
void	recalc ()
	The function for calculating sdata. More...
void	recalc_S ()
	If the following function is implemented, it should only calculate the S matrix and B vector parts of data, leaving the C matrix part stale. More...

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Detailed Description

An ideal attenuator including Johnson noise.

Definition at line 51 of file attenuator.h.

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Constructor & Destructor Documentation

attenuator::attenuator ( double a = 3.0 )

Default constructor creates a 3 dB attenuator. Definition at line 39 of file attenuator.cc.

attenuator::attenuator ( const abstract_real_parameter * a )

Construct a shadowed parameter attenuator. Parameters: a   attenuation in dBs Definition at line 42 of file attenuator.cc.

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Member Function Documentation

const nport::data_info & attenuator::get_data_info ( ) [inline, virtual]

Attenuators are "active" noise sources if not at device::T. Reimplemented from nport. Definition at line 87 of file attenuator.h.

void attenuator::recalc ( ) [private, virtual]

The function for calculating sdata. recalc() should do the following: (1) Read device::f, device::Z0, and, by default, device::T to get the operating conditions for the response calculation. (2) Calculate the S, C, and B matrix values and store them to nport::data, with all values normalized using device::Z0. (3) Store the normalizing impedance to nport::data by calling data.set_znorm(). Reimplemented from nport. Definition at line 63 of file attenuator.cc.

void attenuator::recalc_S ( ) [private, virtual]

If the following function is implemented, it should only calculate the S matrix and B vector parts of data, leaving the C matrix part stale. Reimplemented from nport. Definition at line 46 of file attenuator.cc. Referenced by recalc().

int attenuator::size ( ) [inline, virtual]

Attenuators are 2 port devices. Returns: the number of ports Reimplemented from nport. Definition at line 82 of file attenuator.h.

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Member Data Documentation

parameter attenuator::Temp

Temperature in standard units. Shadows global temperature T by default. Definition at line 63 of file attenuator.h.

parameter attenuator::dB

Attenuation in dB; impedance is given by device::Z0. Definition at line 57 of file attenuator.h.

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The documentation for this class was generated from the following files:

• attenuator.h
• attenuator.cc

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