Transmission/reception integrated radio-frequency apparatus

• US 20060195874A1
• Filed: 04/17/2006
• Published: 08/31/2006
• Est. Priority Date: 06/30/2000
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kudo, Katsuya, Oosawa, Masami, Abe, Shuji
• Granted Patent: US 7,680,509 B2
• Time in Patent Office: Days
• US Class Current: 725/100
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04N 7/102 Circuits therefor, e.g. noise reducers, equalisers, amplifiers H04N7/108 takes precedence

Abstract

There is provided a highly reliable transmission/reception integrated radio-frequency apparatus which can achieve a high communication quality in a cable modem. A reception RF signal is input to a reception system block via an input/output terminal, converted to an intermediate-frequency signal, and output from a terminal. An output terminal of a transmission processing section of a transmission system block is connected to the input/output terminal via an overvoltage protection circuit, a high-pass filter functioning as a countermeasure to overvoltage, and a low-pass filter for suppressing harmonics produced from the high-pass filter.

Claims

1-10. -10. (canceled)

11. A transmission/reception integrated radio-frequency apparatus comprising:

a frame-like external shield plate surrounding a periphery of a board;

an input/output terminal provided on one side of the frame-like shield plate;

an internal shield plate for dividing the board surrounded by the external shield plate into a first region including an area of the input/output terminal and a second region adjacent to the input/output terminal;

a reception system block, formed on the first region of the board, for receiving a first radio-frequency signal supplied to the input/output terminal, converting the first radio-frequency signal to an intermediate-frequency signal, and outputting the intermediate-frequency signal;

a transmission system block, formed on the second region of the board, for processing a second radio-frequency signal for transmission, and outputting the processed second radio-frequency signal to the input/output terminal; and

an output terminal for deriving the output signal from the reception system block and an input terminal for supplying the second radio-frequency signal to the transmission system block, the output terminal and the input terminal being provided on a side of the external shield plate which is adjacent to said side provided with the input/output terminal and is opposed to the transmission system block.

12. A transmission/reception integrated radio-frequency apparatus according to claim 11, wherein a distance between said input terminal and said output terminal is set at 30 mm or more and 60 mm or less.

13-15. -15. (canceled)

16. A transmission/reception integrated radio-frequency apparatus comprising:

a reception system block and a transmission processing section mounted on a single board;

a signal input terminal provided to deliver a radio-frequency signal to the transmission processing section; and

an equilibrium 2-terminal input circuit for receiving the radio-frequency signal from the signal input terminal and delivering the radio-frequency signal to the transmission processing section.

17. A transmission/reception integrated radio-frequency apparatus according to claim 16, wherein said equilibrium 2-terminal input circuit is an equilibrium 2-terminal low-pass filter which does not a ground circuit immediately after the radio-frequency signal is input.

18-25. -25. (canceled)