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. 22, 1981
Filed:
Jan. 17, 1980
Robert D Nicholson, Holyport, nr. Maidenhead, GB;
Racal-Dana Instruments Limited, Bracknell, GB;
Abstract
An A.G.C. circuit is disclosed having two modulators connected in series to modulate an input signal and an amplifier for amplifying the output of the second modulator and applying it to an output terminal. A detector detects the output of the amplifier and an integrator compares the detected level with a reference so as to produce a control signal dependent on the error. The control signal is applied to the first modulator through an impedance path having an impedance which decreases with increasing frequency, and is applied to the same modulator through an impedance path having an impedance which increases with increasing frequency. In this way, the first modulator performs modulation primarily dependent on the A.C. component of the control signal and a second modulator performs modulation primarily dependent on its D.C. components of the control signal. Therefore, changes in the gain of the amplifier, or in the level of the input signal, which tend to alter the upper limit of the loop bandwidth of the circuit, are substantially offset by the effect of the resultant change in the gain of the second modulator.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile