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This modified bucket-brigade shift register circuit allows open drain digital inputs to be interfaced to the shift register without the blooming of the input signal into two shift register stages.
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Digital Input For Bucket-Brigade Shift Register
This modified bucket-brigade shift register circuit allows open drain digital
inputs to be interfaced to the shift register without the blooming of the input signal
into two shift register stages.
The figure illustrates a conventional bucket-brigade shift register including
first stage T1, T2, C1 and C2 and second stage T4, T5, C3 and C4 having digital
input devices T3 and T6, respectively. The shift register transfers data from left to
right in response to complementary clocking signals A and B. Without the
presence of the added circuitry, shown in bold lines, when data is entered into
the first stage corresponding to the discharged state of node N1 by the input D1
going high, capacitance CS1 is discharged substantially to ground. When clock
lines A and B resume and clock B rises to transfer information to the right, node
N2 is discharged below the level of clock B less the threshold voltage of T2,
failing to fully charge C1, CS1. Thus, on the next occurrence of clock A, the
transfer of data from node N4 to N1, blooming occurs, since the no-charge state
of node N1 has been allowed to remain on N1 after that charge state was
transferred to node N2.
The added circuitry eliminates the problem of blooming by providing
additional devices T1' and T2' in parallel with T1 and T2 and by providing two
capacitances C1 and C1' equal to one-half the capacitance of the required C1 in
a conventional circuit. C2 remains the same v...