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. 05, 1989
Filed:
Mar. 09, 1989
Colin S Aitchison, Redhill, GB;
ERA Patents Limited, Leatherhead, GB;
Abstract
Logarithmic amplifiers which have a logarithmic transfer characteristic may be used in microwave instrumentation. Such an amplifier includes a series of MESFET distributed amplifiers (DA1-DA8) connected in cascade, with each of the MESFET distributed amplifiers (DA1-DA8) having a gate transmission line (G1-G8) and a drain transmission line (D1-D8) which share a common ground or source line (5), and a number of MESFETs (1-4) connected in parallel with their gate electrodes (g) connected at spaced intervals along the gate transmission line (G1-G8) their drain electrodes (d) connected at spaced intervals along the drain transmission line (D1-D8) and their source electrodes (s) connected to the source line (5). A low pass filter (LPF1-LPF8) is connected to the downstream end of the gate transmission line (G1-G8) of each distributed amplifier (DA1-DA8) with each low pass filter (LPF1-LPF8) passing only the rectified component of the travelling wave passing along each gate transmission line (G1-G 8). A summer (OP1) is connected to the outputs of each of the low pass filters (LPF4-LPF8) to sum them and provide an output (O/P) which provides the output of the logarithmic amplifier.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile