SIX PORT LINEAR NETWORK SINGLE WIRE MULTI SWITCH TRANSCEIVER

• US 20100071009A1
• Filed: 03/26/2008
• Published: 03/18/2010
• Est. Priority Date: 03/26/2007
• Status: Active Grant

• Current Assignee: InterDigital Madison Patent Holdings (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Fitzpatrick, John James, Xiu, Lincheng
• Granted Patent: US 8,699,983 B2
• Time in Patent Office: Days
• US Class Current: 725/64
• CPC Class Codes: H01Q 1/247 with frequency mixer, e.g. for direct satellite reception or Doppler radar
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H03F 1/52 Circuit arrangements for protecting such amplifiers monitoring arrangements G01R31/28; increasing reliability in communication systems, e.g. using redundancy H04B1/74
• CPC Class Codes: H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
• CPC Class Codes: H03H 2/008 Receiver or amplifier input circuits
• CPC Class Codes: H03H 3/06 for the manufacture of magnetostrictive resonators or networks
• CPC Class Codes: H03H 7/0138 Electrical filters or coupling circuits
• CPC Class Codes: H03J 3/06 Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
• CPC Class Codes: H03J 3/24 of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

A fluid sensor comprises a sensor housing (12), a sensor package (14), an actuator (16) and a switch (18). The sensor package (14) is disposed within the sensor housing (12) and includes first and second screens and at least one sensing membrane. The sensing membrane is disposed between the first and second screens (36) and is adapted to expand when exposed to a predetermined quantity of a first predetermined fluid. The actuator (16) is disposed proximate the sensor package (14) within the sensor housing (12) and moveable between a first position and a second position through an intermediate position. The switch (18) is disposed proximate the actuator (16) and is operable between closed and open positions. When the actuator (16) is in the second position at least a portion of the actuator (16) depresses the switch (18) to control an-electrical, circuit connected therewith.

Claims

1. An apparatus comprising:

a first DC voltage block coupled between a source of a first RF signal and a first transmission line, said first RF signal having a first frequency;

a second DC voltage block coupled between a source of a DC potential and a source of reference potential; and

a first band reject filter for rejecting said first frequency, coupled between said source of the DC potential and the first transmission line.

2. The apparatus of claim 1 further comprising:

a third DC voltage block coupled between a source of a second RF signal and a second transmission line, said second RF signal having a second frequency;

a second band reject filter for rejecting said second frequency, coupled between said first transmission line and the second transmission line; and

a low pass filter coupled between the first transmission line and the source of reference potential.

3. The apparatus of claim 1 wherein said first DC block comprises a high pass filter.

4. The apparatus of claim 1 wherein said second DC block comprises a high pass filter.

5. The apparatus of claim 1 wherein said first band reject filter comprises a resistor, capacitor and inductor arranged in parallel.

6. The apparatus of claim 1 wherein said first band reject filter is configured to reject a 22 kHz DiSEqC tone.

7. The apparatus of claim 2 wherein said second band reject filter is configured to reject a 2.3 MHz signal.

8. The apparatus of claim 1 wherein said second DC voltage block is operative to conduct a 22 kHz signal and a 2.3 MHz signal to said source of reference potential.

9. The apparatus of claim 2 further comprising a linear inductance between said second transmission line and a tuner.

10. The apparatus of claim 2 wherein said second frequency is higher than said first frequency.

12. The apparatus of claim 1 further comprising:

a third means for blocking a DC voltage coupled between a source of a second RF signal and a second transmission line, said second RF signal having a second frequency;

a means for rejecting said second frequency, coupled between said first transmission line and the second transmission line; and

a means for conducting said first frequency and said second frequency and for blocking a DC voltage coupled between the first transmission line and the source of reference potential.

17. The apparatus of claim 12 wherein said means for rejecting said second frequency is configured to reject a 2.3 MHz signal.

18. The apparatus of claim 1 wherein said second means for blocking a DC voltage is operative to conduct a 22 kHz signal and a 2.3 MHz signal to said source of reference potential.

19. The apparatus of claim 2 further comprising a means for providing a linear inductance, wherein said means for providing a linear inductance is coupled between said second transmission line and a means for tuning an RF signal.

20. The apparatus of claim 12 wherein said second frequency is higher than said first frequency.

11. A signal processing system comprising:

a first means for blocking a DC voltage coupled between a source of a first RF signal and a first transmission line, said first RF signal having a first frequency;

a second means for blocking a DC voltage coupled between a source of a DC potential and a source of reference potential; and

a means for rejecting said first frequency coupled between said source of the DC potential and the first transmission line.

13. The apparatus of claim 11 wherein said first means for blocking a DC voltage comprises a high pass filter.

14. The apparatus of claim 11 wherein said second means for blocking a DC voltage comprises a high pass filter.

15. The apparatus of claim 11 wherein said means for rejecting said first frequency comprises a resistor, capacitor and inductor arranged in parallel.

16. The apparatus of claim 11 wherein said means for rejecting said first frequency is configured to reject a 22 kHz DiSEqC tone.