N-port receiver with RF/LO isolation

US6704562B1 · kind B1 · utility

Assignees

• Sony International (Europe) GmbH · DE
• SONY GROUP CORPORATION · JP

Inventors

• Gerald Oberschmidt · Fellbach, DE
• Veselin Brankovic · Eßlingen, DE
• Dragan Krupezevic · Stuttgart, DE
• Masayoshi Abe · Tokyo, JP
• Thomas Dölle · Chemnitz, DE
• Tino Konschak · Stuttgart, DE

Key dates

• Filing date: Jun 14, 2000
• Grant date: Mar 9, 2004
• Expiry date: Nov 28, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03D3/00
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A RF receiver for modulated RF signals based on a N-port junction (1) providing LO/RF isolation is proposed. N thereby is an integer larger than two, such that the N-port junction (1) can be preferably a three port, four port, five port and six port junction. The N-port junction (1) supplied with a first RF signal at a first input (2) and with a second RF signal originating from a local oscillator (2) at a second input (3). An isolation block (13) comprising an active circuitry (22) is comprised in the N-port junction for isolating the second input (3) from the first input (1). Thereby can be ensured that the LO signals are significantly attenuated at the RF port (2).