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:
Aug. 22, 1978
Filed:
Jan. 19, 1977
David Lee Raymond, Arcadia, CA (US);
Analog Technology Corporation, Irwindale, CA (US);
Abstract
A current-to-frequency converter in which a succession of small charge feedback pulses is selectively generated to null the input current. The feedback pulses are generated by applying voltage pulses of precisely controlled magnitude to a precision capacitor to produce pulses of precisely-determined charge content. These pulses are then applied to a charge-dividing circuit including a matched pair of bipolar transistors. The charge dividing circuit bypasses the bulk of the charge in each pulse, while applying only a minute fraction of each pulse as the feedback current. The charge division ratio is maintained constant by the circuit in spite of temperature fluctuations.