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diff --git a/src/systemc/tests/systemc/misc/sim_tests/biquad/biquad3/delay_line.h b/src/systemc/tests/systemc/misc/sim_tests/biquad/biquad3/delay_line.h
new file mode 100644
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+++ b/src/systemc/tests/systemc/misc/sim_tests/biquad/biquad3/delay_line.h
@@ -0,0 +1,71 @@
+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  delay_line.h -- 
+
+  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
+  changes you are making here.
+
+      Name, Affiliation, Date:
+  Description of Modification:
+
+ *****************************************************************************/
+
+/* Filename delay_line.h */
+/* This is the interface file for synchronous process `delay_line' */
+
+#include "systemc.h"
+
+SC_MODULE( delay_line )
+{
+  SC_HAS_PROCESS( delay_line );
+
+  sc_in<float>  in;
+  sc_out<float> out;
+
+  const int delay; //internal variable
+  float *line; // delay line
+
+  // Constructor 
+  delay_line( sc_module_name NAME,
+	      sc_signal<float>& IN1,
+	      sc_signal<float>& OUT1,
+	      int DELAY=4 )
+    : delay(DELAY)
+  {
+    in(IN1); 
+	out(OUT1);
+	line = new float[delay];
+    for(int i=0; i<delay; i++) line[i] = 0.0;
+
+    SC_METHOD( entry );
+    sensitive << in;
+  }
+
+  // Process functionality in member function below
+  void entry();
+};