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:
Sep. 16, 2003
Filed:
Oct. 25, 2001
Lawrence E. Connell, Naperville, IL (US);
Neal W. Hollenbeck, Palatine, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A high gain wide-band width RF amplifier with automatic bias supply regulation. The load supply is actively adjusted in response to the amplifier's output signal level. At small output signals effective load supply voltage is minimum and at larger output signals the effective load supply voltages is maximized. The amplifier includes a differential pair of field effect transistors (FETs) connected at common source connection and biased by current bias FET which is connected between common source connection and amplifier signal input RFIN. A bias voltage (V ) is applied to the gate of bias device and an automatic gain control voltage (V ) is applied to the gates of differential FET pair . The automatic bias supply circuit is an active load and includes resistors , capacitor and a differential amplifier . Capacitor is connected between the negative input and the output of differential amplifier . A load reference voltage VO is provided to the positive input. Resistor is connected between the output of differential amplifier and the high gain wide-band amplifier output at the drain of FET . Resistor is connected between the output at the drain of FET and the negative input to differential amplifier providing amplifier load signal feedback.