The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 31, 1998
Filed:
Feb. 20, 1996
Behrooz Abdi, Gilbert, AZ (US);
Byron Bynum, Gilbert, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Prior art differential track and hold amplifiers produce an error voltage when transitioning from a track mode to a hold mode. An error voltage limits the resolution of a track and hold amplifier. A first circuit (44) and a second circuit (45) couple a differential voltage to the storage capacitor. Control signals applied to the first and second circuits (44, 45) generate parasitic currents through parasitic capacitances which couple to a storage capacitor of a track and hold amplifier (41). The control signals applied to the first and second circuits (44, 45) are forced to transition an equal voltage magnitude to produce identical parasitic currents through the parasitic capacitance. Identical parasitic currents affect common mode voltage but do not change the differential voltage stored on the storage capacitor. A clamping circuit (50) clamps the voltage transition of the control signals to produce identical voltage transitions.