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:
Mar. 19, 2002
Filed:
Jan. 29, 2001
Stephen F. Colaco, Santa Cruz, CA (US);
Integration Associates Incorporated, Mountain View, CA (US);
Abstract
Disclosed is a front end circuit involving a transimpedance amplifier that drives a resistor, thereby lowering the input impedance of the circuit by dividing the feedback resistance by the gain of the amplifier. In the front end circuit of the present invention, a first transistor is coupled in series with a resistor, where the received signal is input to a base or gate of the first transistor and the amplified received signal is recovered from a collector or drain of the first transistor such that the first transistor and resistor provide the gain of the front end circuit. A second transistor has an emitter or source coupled to the base or gate of the first transistor. A base or gate of the second transistor is coupled to the collector or drain of the first transistor and a collector or drain of the second transistor is coupled to a power supply rail. The second transistor thus provides the feedback path for the transimpedance amplifier thereby reducing the input impedance of the circuit.