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<p>In addition to the feedback oscillators described above, which use <a href="page.php?w=two-port_network">two-port</a> amplifying active elements such as transistors and operational amplifiers, linear oscillators can also be built using <a href="page.php?w=port_%28circuit_theory%29">one-port</a> (two terminal) devices with <a href="page.php?w=negative_resistance">negative resistance</a>, such as <a href="page.php?w=magnetron">magnetron</a> tubes, <a href="page.php?w=tunnel_diode">tunnel diode</a>s, <a href="page.php?w=IMPATT_diode">IMPATT diode</a>s</p><p>
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