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:
Nov. 18, 1997
Filed:
Apr. 12, 1996
Tadayoshi Nakatsuka, Toyonaka, JP;
Jyunji Itoh, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A front-end circuit which receives a first input signal and a second input signal, and outputs an output signal having a differential frequency between the first input signal and the second input signal includes: a first amplifier having an input terminal, a power supply terminal and a virtual ground; a second amplifier having an input terminal, a power supply terminal and a ground; and a mixer having a first and a second input terminals, a power supply terminal and a virtual ground. In the front-end circuit, the virtual ground of the mixer is dc-coupled to the power supply terminal of the first amplifier, the virtual ground of the first amplifier is dc-coupled to the power supply terminal of the second amplifier, the power supply terminal of the first amplifier and the second amplifier are ac-coupled to the first and the second input terminals, respectively, and the input terminal of the first amplifier and the input terminal of the second amplifier receive the first and the second input signals, respectively, and a power supply voltage is supplied to the power supply terminal of the mixer and the ground.