Tunnel Diode-Charge Storage Diode Shift Register

A new method for shift register design based on a tunnel diode-charge storage diode combination is described. The tunnel diode acts as the permanent store with the charge storage diode as the temporary store to hold information while the main store is cleared. The circuit has very good tolerances and high rejection of extraneous pickup. Clock frequencies in excess of 100 MHz have been used with 1012 shifts successfully executed without a failure.