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:
Jul. 24, 2001
Filed:
May. 14, 1999
Melchiorre Bruccoleri, Rho, IT;
Valerio Pisati, Bosnasco, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
A waveform track-and-hold circuit receives an analog input signal and generates an analog output signal. The waveform track-and-hold circuit includes a differential separating input stage, a differential separating output stage, first and second charge storage means, and switch means. The first and second charge storage means are coupled between the differential separating input stage and the differential separating output stage, and the switch means are controlled by a logic control signal so as to selectively isolate the first and second charge storage means from the analog input signal. Additionally, the differential separating input stage includes a push-pull input stage connected to the switch means and receiving the analog input signal. In a preferred embodiment, the analog input signal is supplied to the emitters of transistors that form the push-pull input stage, the collectors of the transistors are connected to the switch means, and the transistors are part of current mirror circuits.