Electrical pulse counters – pulse dividers – or shift registers: c – Shift register
Reexamination Certificate
2007-11-09
2008-10-14
Cox, Cassandra (Department: 2816)
Electrical pulse counters, pulse dividers, or shift registers: c
Shift register
C377S079000
Reexamination Certificate
active
07436923
ABSTRACT:
Threshold voltage shifts of transistors which are constituents of a bidirectional shift register are reduced to prevent a malfunction in the shift register. A bidirectional unit shift register includes first and second pull-down circuits (41, 42) connected to the gate of a first transistor (Q1) that supplies a first clock signal (CLK) to an output terminal (OUT). The first pull-down circuit (41) includes a first inverter that uses the gate of the first transistor (Q1) as the input node and that is activated by the first clock signal (CLK), and a second transistor (Q5A) that discharges the gate of the first transistor (Q1) according to the output of the first inverter. The second pull-down circuit (42) includes a second inverter that uses the gate of the first transistor (Q1) as the input node and that is activated by a second clock signal (/CLK) having a different phase from the first clock signal (CLK), and a third transistor (Q5A) that discharges the gate of the first transistor according to the output of the second inverter.
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Cox Cassandra
Mitsubishi Electric Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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