Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
215 words
A threshold value switch, for input signals of both polarities, providing an output signal when a threshold value, equal in magnitude for both polarities, is exceeded, and including at least four field effect transistors of the excitation type, said threshold value switch comprising, in combination, two paired first field effect transistors of respective different channel types; a first voltage divider, including two identical first resistors, interconnecting the drain electrodes of said first transistors; first circuit means connecting the gate electrodes of said first transistors to each other and to the midpoint of said first voltage divider; two paired second field effect transistors of respective different channel types; two identical additional resistors each connecting the gate electrode of a respective second transistor to the drain electrode of that first transistor of the same respective channel type; a second voltage divider, including two identical second resistors, interconnecting the gate electrodes of said second transistors; an input terminal connected to the midpoint of said second voltage divider; a pair of supply voltage terminals; second circuit means connecting the source electrodes of each of two transistors of the same channel type to each other and to a respective supply voltage terminal; and a pair of output signal terminals each connected to the drain electrode of a respective second transistor.
Claim 2
Dependent Claim
215 words
A threshold value switch, for input signals of both polarities, providing an output signal when a threshold value, equal in magnitude for both polarities, is exceeded, and including at least four field effect transistors of the excitation type, said threshold value switch comprising, in combination, two paired first field effect transistors of respective different channel types; a first voltage divider, including two identical first resistors, interconnecting the drain electrodes of said first transistors; first circuit means connecting the gate electrodes of said first transistors to each other and to the midpoint of said first voltage divider; two paired second field effect transistors of respective different channel types; two identical additional resistors each connecting the gate electrode of a respective second transistor to the drain electrode of that first transistor of the same respective channel type; a second voltage divider, including two identical second resistors, interconnecting the gate electrodes of said second transistors; an input terminal connected to the midpoint of said second voltage divider; a pair of supply voltage terminals; second circuit means connecting the source electrodes of each of two transistors of the same channel type to each other and to a respective supply voltage terminal; and a pair of output signal terminals each connected to the drain electrode of a respective second transistor.
Claim 3
Dependent Claim
29 words
A threshold value switch, as claimed in claim 1, in which the setting of the threshold value can be varied by varying the voltage of the supply voltage source.
Claim 4
Dependent Claim
30 words
A threshold value switch, as claimed in claim 1, in which the setting of the threshold value can be varied by a series resistance associated with the supply voltage source.
Claim 5
Dependent Claim
33 words
A threshold value switch, as claimed in claim 1, including respective means connecting the drain electrode of each second field effect transistor to the gate electrode of the other second field effect transistor.
Claim 6
Dependent Claim
72 words
A threshold value switch, as claimed in claim 4, including respective diodes arranged in the connection between the drain electrode of each second transistor and the gate electrode of the other second transistor; means connecting each diode to a respective supply voltage terminal; said diodes being connected with respective polarities such that they are biased in blocking direction by the connected respective supply voltage terminal in the rest state of said switch.
Claim 7
Dependent Claim
59 words
A threshold value switch, as claimed in claim 5, including a capacitor connected in series in one connection between a drain electrode of a second field effect transistor and a gate electrode of the other second field effect transistor; and a resistor connecting the drain electrode of said one second field effect transistor to the respective supply voltage terminal.
Claim 8
Dependent Claim
75 words
A threshold value switch, as claimed in claim 1, including respective further voltage dividers each connecting the drain electrode of a respective second field effect transistor to that supply voltage terminal connected to the source electrode of the other second field effect transistor; and means connecting the substrate terminal of each second field effect transistor to the midpoint of that further voltage divider connected to the drain electrode of the other second field effect transistor.