Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
245 words
In an input circuit having an input node and an output node, for a monolithically integrated semiconductor storage of field effect transistors, which input circiut is controlled with low signal levels applied to its input node and which input circuit for level conversion uses bootstrap means, and which input circuit contains a dynamically operating charge-up circuit for charging up a bootstrapping node of the bootstrap means to the operating voltage, the improvement in the charge-up circuit comprises: a coupling capacitor having an input node and an output node; a first inverter having its input connected to the output node of the input circuit and its output connected to the input node of the coupling capacitor; first and second FET's, the gate of the first FET and the source of the second FET being connected to the output node of said coupling capacitor, the drain of said first and second FET's being connected in common to a voltage source; a discharge circuit having one end connected to the output node of the coupling capacitor, the opposite end of the discharge circuit being connected to the gate of the second FET; a second inverter having its input connected to the output of the first inverter and its output connected to the gate of the second FET; said first FET having its source connected to the said bootstrapping node of the bootstrap means, whereby the charge-up circuit causes the bootstrap means to be maintained at full operating voltage.
Claim 2
Dependent Claim
245 words
In an input circuit having an input node and an output node, for a monolithically integrated semiconductor storage of field effect transistors, which input circiut is controlled with low signal levels applied to its input node and which input circuit for level conversion uses bootstrap means, and which input circuit contains a dynamically operating charge-up circuit for charging up a bootstrapping node of the bootstrap means to the operating voltage, the improvement in the charge-up circuit comprises: a coupling capacitor having an input node and an output node; a first inverter having its input connected to the output node of the input circuit and its output connected to the input node of the coupling capacitor; first and second FET's, the gate of the first FET and the source of the second FET being connected to the output node of said coupling capacitor, the drain of said first and second FET's being connected in common to a voltage source; a discharge circuit having one end connected to the output node of the coupling capacitor, the opposite end of the discharge circuit being connected to the gate of the second FET; a second inverter having its input connected to the output of the first inverter and its output connected to the gate of the second FET; said first FET having its source connected to the said bootstrapping node of the bootstrap means, whereby the charge-up circuit causes the bootstrap means to be maintained at full operating voltage.
Claim 3
Dependent Claim
74 words
A circuit as claimed in claim 1, wherein the discharge circuit comprises a series connection of a plurality of FET's, the first of which is connected to the output node of said coupling capacitor and is maintained continuously conductive, the other of said plurality of FET's being at least one load FET, with its gate electrode being connected to its drain electrode, its source electrode being connected to the gate of said second FET.
Claim 4
Dependent Claim
15 words
A circuit as in claim 1 or 2, wherein the input circuit comprises an inverter.
Claim 5
Dependent Claim
16 words
A circuit as in claim 1 or 2, wherein the input circuit comprises a non-inverting buffer.
Claim 6
Dependent Claim
13 words
A circuit as in claim 1 or 2, wherein the FET's are N-channel.
Claim 7
Dependent Claim
13 words
A circuit as in claim 1 or 2, wherein the FET's are P-channel.