Active Splitter Device and Method Using Diplexed Front End

• US 20090141183A1
• Filed: 04/12/2006
• Published: 06/04/2009
• Est. Priority Date: 04/12/2006
• Status: Abandoned Application

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Ecoff, Clint Alan, Pugel, Michael Anthony
• Application Number:
  US12/226,093
• Publication Number:
  US 20090141183A1
• Time in Patent Office: Days
• US Class Current: 348/731
• CPC Class Codes: H03F 1/26 Modifications of amplifiers to reduce influence of noise generated by amplifying elements
• CPC Class Codes: H03F 1/42 Modifications of amplifiers to extend the bandwidth
• CPC Class Codes: H03F 2200/294 the amplifier being a low noise amplifier [LNA]
• CPC Class Codes: H03F 2200/372 Noise reduction and elimination in amplifier
• CPC Class Codes: H03F 2200/429 Two or more amplifiers or one amplifier with filters for different frequency bands are coupled in parallel at the input or output
• CPC Class Codes: H03F 2200/541 Transformer coupled at the output of an amplifier
• CPC Class Codes: H03F 2200/63 the amplifier being suitable for CATV applications
• CPC Class Codes: H03F 2203/21112 A filter circuit being added at the input of a power amplifier stage
• CPC Class Codes: H03F 3/191 Tuned amplifiers H03F3/193, H03F3/195 take precedence
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/60 Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators H03F3/54 takes precedence
• CPC Class Codes: H03F 3/602 Combinations of several amplifiers

Abstract

A method and apparatus is presented for actively signal splitting an RF signal. Specifically, the RF signal is frequency-separated to generate a first signal including a first set of frequencies and a second signal including a second set of frequencies. The first and second signals are independently amplified to generate first and second amplified signals, respectively. The first and second amplified signals are then combined to generate a recombined signal. The recombined signal is divided to generate first and second splitter output signals.

Claims

1. A method of processing a plurality of signals in a frequency band comprising the steps of:

separating said frequency band into a first set of frequencies and a second set of frequencies,

amplifying said first set of frequencies

amplifying said second set of frequencies

combining said first set of frequencies and said second set of frequencies to generate a recombined signal.

2. The method of claim 1 further comprising the step of dividing said recombined signal to generate a first output signal comprising a third set of frequencies and a second output signal comprising a fourth set of frequencies.

3. The method of claim 1, wherein said first set of frequencies includes frequencies above about 328.6 MHz and said second set of frequencies includes frequencies below about 328.6 MHz.

4. The method of claim 1, wherein said first set of frequencies includes one or more UHF channels.

5. The method of claim 1, wherein said second set of frequencies includes one or more VHF channels.

6. The method of claim 1, wherein at said separating step employs a diplex filter.

7. The method of claim 1, wherein at said combining step employs a diplex filter.

8. The method of claim 1, wherein said separating step employs a diplexer.

9. The method of claim 1, wherein said combining step employs a diplexer.

10. The method of claim 1, wherein said dividing step employs a passive transformer circuit.

11. The method of claim 1, wherein said at least one RF signal includes a plurality of RF signals of terrestrial origin.

12. An apparatus, comprising:

a signal separator configured to receive an RF input signal, said signal separator having a first output for conveying a first separated signal and a second output for conveying a second separated signal;

a first amplifier coupled to receive said first separated signal and having a first amplifier output for conveying a first amplified separated signal;

a second amplifier coupled to receive said second separated signal and having a second amplifier output for conveying a second amplified separated signal; and

a signal combiner coupled to receive said first amplified separated signal and said second amplified separated signal, said signal combiner having a signal combiner output for conveying a recombined signal.

13. The apparatus of claim 12 further comprising a signal divider coupled to receive said recombined signal, said signal divider having a first signal divider output for conveying a first splitter output signal and a second signal divider output for conveying a second splitter output signal.

14. The apparatus of claim 12 wherein said signal separator includes a diplex filter.

15. The apparatus of claim 12 wherein said signal combiner includes a diplexer.

16. The apparatus of claim 12 wherein said signal divider includes a transformer.

17. The apparatus of claim 12 wherein said signal divider includes a balun.

18. The apparatus of claim 12 wherein said first signal divider output is configured to be coupled to a first tuner, and said second signal divider output is configured to be coupled to a second tuner.

19. The apparatus of claim 12 wherein said splitter exhibits intermodulation distortion performance acceptable for use in a terrestrial reception signal environment.

20. A television signal processing system, comprising:

(a) an antenna;

(b) a signal splitter coupled to said antenna, said signal splitter having a first splitter output and a second splitter output;

(c) a first tuner coupled to said first splitter output;

(d) a second tuner coupled to said second splitter output;

(e) wherein said signal splitter includes a diplex filter configured to receive an RF input signal from said antenna, said diplex filter having a first diplex output for conveying an upper-frequency signal and a second diplex output for conveying a lower-frequency signal;

a first low-noise amplifier coupled to receive said upper-frequency signal and having a first amplifier output for conveying an amplified upper-frequency signal;

a second low-noise amplifier coupled to receive said lower-frequency signal and having a second amplifier output for conveying an amplified lower-frequency signal;

a diplexer coupled to receive said amplified upper-frequency signal and said amplified lower-frequency signal, said diplexer having a recombined output for conveying a recombined signal; and

a transformer coupled to receive said recombined signal, said transformer conveying a first splitter output signal at said first splitter output and conveying a second splitter output signal at said second splitter output.