<?xml version="1.0" encoding="ISO-8859-1"?><?xml-stylesheet href="/usr/local/vamdoc-1.0.2-kluwer/config/model.xsl" type="text/xsl"?><!DOCTYPE model SYSTEM "/usr/local/vamdoc-1.0.2-kluwer/config/model.dtd"><model>  <symbol>../symbol/vco.png</symbol>  <comments>    <title>Voltage controlled oscillator</title>    <model_name>VCO(ANALOG)<br></br>VCO(DIGITAL)</model_name>    <library>N/A</library>    <structure>N/A</structure>    <description>The test-bench describes a voltage controlled oscillator<br></br>which includes an analog and a digital architecture.<br></br>The analog realization uses a sine wave with tunable frequency<br></br>while the digital realization uses a process that produces<br></br>a square wave.<br></br></description>    <link_source><A HREF="../src/vco.vhd">See source code</A></link_source>    <dependency>      <library>IEEE_proposed</library>      <design_unit>ELECTRICAL_SYSTEMS</design_unit>    </dependency>    <dependency>      <library>IEEE</library>      <design_unit>MATH_REAL</design_unit>    </dependency>  </comments>  <interface>    <parameter>      <name>DC</name>      <type>real</type>      <default>0.0</default>      <unit>V</unit>      <comment> dc offset of oscillator </comment>    </parameter>    <parameter>      <name>AMPL_DBM</name>      <type>real</type>      <default>-100.0</default>      <unit>dBm</unit>      <comment> amplitude of sine wave </comment>    </parameter>    <parameter>      <name>FREQ_0</name>      <type>real</type>      <default>1.0e03</default>      <unit>Hz</unit>      <min> &gt;0.0</min>      <comment> free running frequency </comment>    </parameter>    <parameter>      <name>PHASE_0</name>      <type>real</type>      <default>0.0</default>      <unit>rad</unit>      <comment> constant phase offset </comment>    </parameter>    <parameter>      <name>K_FREQ</name>      <type>real</type>      <default>1.0e06</default>      <unit>Hz/V</unit>      <comment> sensitivity of voltage input </comment>    </parameter>    <parameter>      <name>RIN</name>      <type>real</type>      <default>50.0</default>      <unit>Ohm</unit>      <min> &gt;0.0</min>      <comment> input resistance </comment>    </parameter>    <parameter>      <name>ROUT</name>      <type>real</type>      <default>50.0</default>      <unit>Ohm</unit>      <min> &gt;0.0</min>      <comment> output resistance </comment>    </parameter>    <port>      <port_id>terminal</port_id>      <name>P_CTRL</name>      <port_type>ELECTRICAL</port_type>      <comment> control pin</comment>    </port>    <port>      <port_id>terminal</port_id>      <name>P_OUT</name>      <port_type>ELECTRICAL</port_type>      <comment> output pin </comment>    </port>    <port>      <port_id>terminal</port_id>      <name>VDD</name>      <port_type>ELECTRICAL</port_type>      <comment> supply voltage</comment>    </port>    <port>      <port_id>terminal</port_id>      <name>GND</name>      <port_type>ELECTRICAL</port_type>      <comment> reference pin</comment>    </port>  </interface></model>