Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Signal transmission integrity or spurious noise override
Patent
1996-09-11
1998-04-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Signal transmission integrity or spurious noise override
327109, 327382, 327407, 327494, 327496, 327587, 327588, H03K 1716
Patent
active
057450030
ABSTRACT:
A multi-level driver circuit comprises: (a) an output buffer; (b) a first switch for applying a first analog level to the output buffer when in a closed state; (c) a second switch for applying a second analog level to the output buffer when in a closed state; (d) a third switch for applying a third analog level to the output buffer when in a closed state, wherein the third switch applies to the output buffer a capacitance which is dependent upon level when the third switch is in an open state and is unclamped; and (e) a clamping circuit for clamping the third switch such that the third switch applies to the output buffer a capacitance which is substantially independent of the third analog level when the third switch is in an open state and is clamped by the clamping circuit. The switches can be solid-state switches, such as diode bridges. Any number of switches can be provided, and more than one of the switches can be provided with a clamping circuit.
REFERENCES:
patent: 4885545 (1989-12-01), Sanielevici
patent: 5036219 (1991-07-01), Dingwall et al.
patent: 5276355 (1994-01-01), Nagata
patent: 5287022 (1994-02-01), Wilsher et al.
patent: 5430400 (1995-07-01), Herlein et al.
Nomura Toshihiro
Wakimoto Tsutomu
Callahan Timothy P.
Riter Bruce D.
Schlumberger Technologies Inc.
Zweizig Jeffrey
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