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:
Dec. 17, 1991
Filed:
Aug. 02, 1990
Frederick M Fliegel, Tempe, AZ (US);
Frederick Y Cho, Scottsdale, AZ (US);
Fred S Hickernell, Phoenix, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A bipolar injector structure, similar to a common-base amplifier circuit, is described for use as a unidirectional injector of charge for a charge-transfer device input circuit. This injector structure acts to reduce the input impedance of such devices. A plurality of bipolar injector structures may be implemented on a single ACT device channel, and electrically connected in parallel, to effect a further reduction of input impedance and a further increase in device dynamic range. By employing an input contact structure which allows charge to be injected at more than one point along the length of the channel, without perturbing charge which was injected at some earlier time, a means for forming a transversal filter function can be realized at the input contact structure in addition to that which is achieved at the output contact structure, thus permitting improved ACT device selectivity when operated as a filter. The plurality of bipolar injection structures form a transversal filter, allowing the overall ACT device to achieve out-of-band rejection and selectivity.