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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/frequency-modeling/tb_lpf_dot_ltf_ztf-1.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/frequency-modeling/tb_lpf_dot_ltf_ztf-1.vhd
new file mode 100644
index 000000000..a26499e6d
--- /dev/null
+++ b/testsuite/vests/vhdl-ams/ashenden/compliant/frequency-modeling/tb_lpf_dot_ltf_ztf-1.vhd
@@ -0,0 +1,76 @@
+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs is free software; you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by the
+-- Free Software Foundation; either version 2 of the License, or (at
+-- your option) any later version. 
+
+-- VESTs is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+-- for more details. 
+
+-- You should have received a copy of the GNU General Public License
+-- along with VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+library IEEE;
+use IEEE.std_logic_1164.all;
+library IEEE_proposed;
+use IEEE_proposed.electrical_systems.all;
+
+entity tb_lpf_dot_ltf_ztf is
+end tb_lpf_dot_ltf_ztf;
+
+architecture TB_lpf_dot_ltf_ztf of tb_lpf_dot_ltf_ztf is
+    -- Component declarations
+    -- Signal declarations
+    terminal in_src : electrical;
+    terminal out_dot, out_ltf, out_ztf1, out_ztf4, out_RC : electrical;
+begin
+    -- Signal assignments
+    -- Component instances
+    vio : entity work.v_sine(ideal)
+        generic map(
+            freq => 100.0,
+            amplitude => 5.0
+        )
+        port map(
+            pos => in_src,
+            neg => ELECTRICAL_REF
+        );
+
+	RC1 : entity work.lowpass(RC)
+
+		port map(
+            input => in_src,
+			output => out_RC
+        );
+	dot1 : entity work.lowpass(dot)
+
+		port map(
+            input => in_src,
+			output => out_dot
+        );
+    ltf1 : entity work.lowpass(ltf)
+
+    	port map(
+            input => in_src,
+			output => out_ltf
+        );
+    ztf1 : entity work.lowpass(ztf)
+ 
+    	port map(
+            input => in_src,
+			output => out_ztf1
+        );
+    ztf4 : entity work.lowpass(z_minus_1)
+ 
+    	port map(
+            input => in_src,
+			output => out_ztf4
+        );
+end TB_lpf_dot_ltf_ztf;