Method and system for frequency up-conversion with modulation embodiments

• US 7,245,886 B2
• Filed: 02/03/2005
• Issued: 07/17/2007
• Est. Priority Date: 10/21/1998
• Status: Expired due to Fees

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Cook, Robert W., Bultman, Michael J., Sorrells, David F., Moses, Charley D. Jr., Looke, Richard C.
• Primary Examiner(s): Tran; CongVan
• Application Number:
  US11/049,057
• Publication Number:
  US 20050136861A1
• Time in Patent Office: 894 Days
• Field of Search: 455/118, 455/91, 455/126, 455/78, 455/93, 455/102, 455/103, 455/107, 455/108, 455/114, 375/350, 375/295, 375/298, 375/304
• US Class Current: 455/118
• CPC Class Codes: H03C 1/62 Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present H03C1/28 - H03C1/34, H03C1/46, H03C1/48 take precedence
• CPC Class Codes: H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 2001/0491 with frequency synthesizers, frequency converters or modulators
• CPC Class Codes: H04B 7/12 Frequency diversity

Abstract

A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process. In a fourth modulation embodiment, four information signals are phase and amplitude modulated onto the “I” and “Q” phases of the carrier as part of the up-conversion process. There are at least two implementations of each of the aforementioned embodiments.

Claims

1. An up-converter, comprising:

a first impedance module;

a second impedance module coupled to the first impedance module; and

a switch that gates an infonnation signal as a function of a control signal, wherein the switch is coupled to the first and second impedance modules and to a reference potential, wherein the information signal is coupled to the switch through the first impedance module, and wherein the second impedance module outputs a harmonically rich signal.

2. The up-converter of claim 1, wherein the first impedance module includes an inductor.

3. The up-converter of claim 1, wherein the second impedance module includes a capacitor coupled in series with a resistance.

4. The up-converter of claim 1, wherein the harmonically rich signal is phase modulated as a function of the information signal.

5. The up-converter of claim 1, further comprising a filter coupled to the second impedance module, wherein the filter outputs at least one desired harmonic of a plurality of harmonics of the harmonically rich signal.

6. The up-converter of claim 1, further comprising a pulse shaping module coupled to the switch, wherein the pulse shaping module generates the control signal from an oscillating signal having a frequency that is a sub-harmonic of a desired output frequency of the up-converter.

7. The up-converter of claim 1, wherein the switch opens and closes as a function of the control signal.

8. An up-converter, comprising:

a combining means for generating a combined signal from a first information signal and a second information signal;

a first impedance module coupled to the combining means;

a second impedance module coupled to the first impedance module; and

a gating means for gating the combined signal as a function of a control signal, wherein the gating means is coupled to the first and second impedance modules and to a reference potential, wherein the combined signal is coupled to the gating means through the first impedance module, and wherein the second impedance module outputs an harmonically rich signal.

9. The up-converter of claim 8, wherein the first impedance module includes an inductor.

10. The up-converter of claim 8, wherein the second impedance module includes a capacitor coupled in series with a resistance.

11. The up-converter of claim 8, wherein the harmonically rich signal is phase modulated as a function of the first information signal and amplitude modulated as a function of the second information signal.

12. The up-converter of claim 8, further comprising a filter coupled to the second impedance module, wherein the filter outputs at least one desired harmonic of a plurality of harmonics of the harmonically rich signal.

13. The up-converter of claim 8, further comprising a pulse shaping module coupled to the gating means, wherein the pulse shaping module generates the control signal from an oscillating signal having a frequency that is a sub-hannonic of a desired output frequency of the up-converter.

14. The up-converter of claim 8, wherein the gating means includes a switch that opens and closes as a function of the control signal.

15. An up-converter, comprising:

a first impedance module;

a second impedance module coupled to the first impedance module;

a first gating means for gating a first information signal as a function of an in-phase control signal, wherein the first gating means is coupled to the first and second impedance modules and to a first reference potential, wherein the first information signal is coupled to the first gating means through the first impedance module, and wherein the second impedance module outputs an in-phase harmonically rich signal;

a third impedance module;

a fourth impedance module coupled to the third impedance module; and

a second gating means for gating a second information signal as a function of a phase-shifted control signal, wherein the second gating means is coupled to the third and fourth impedance modules and to a second reference potential, wherein the second information signal is coupled to the second gating means through the third impedance module, and wherein the fourth impedance module outputs a quadrature-phase harmonically rich signal.

16. The up-converter of claim 15, wherein the first impedance module includes a first inductor, and wherein the third impedance module includes a second inductor.

17. The up-converter of claim 15, wherein the second impedance module includes a first capacitor coupled in series with a first resistance, and wherein the fourth impedance module includes a second capacitor coupled in series with a second resistance.

18. The up-converter of claim 15, further comprising:

a first pulse shaping means coupled to the first gating means for generating the in-phase contTol signal from an oscillating signal, wherein the in-phase control signal has a first frequency and a first phase; and

a second pulse shaping means coupled to the second gating means for generating the phase-shifted control signal from a phase-shifted oscillating signal, wherein the phase-shifted control signal has a second frequency and a second phase.

19. The system of claim 18, further comprising:

an oscillator coupled to the first pulse shaping means that outputs the oscillating signal; and

a phase shifter coupled between the oscillator and the second pulse shaping means that outputs the phase-shifted oscillating signal.

20. The up-converter of claim 18, wherein the second frequency is substantially equal to the first frequency.

21. The up-converter of claim 18, wherein the second phase is substantially ninety degrees out of phase with the first phase.

22. The up-converter of claim 15, wherein the first gating means includes a first switch that opens and closes as a function of the in-phase control signal, and wherein the second gating means includes a second switch that opens and closes as a function of the phase-shifted control signal.

23. The up-converter of claim 15, further comprising a summer coupled to the second and fourth impedance modules, wherein the summer outputs an in-phase/quadrature-phase harmonically rich signal.

24. The up-converter of claim 23, further comprising a filter coupled to the summer, wherein the filter outputs at least one desired harmonic of a plurality of harmonics of the in-phase/quadrature-phase harmonically rich signal.

25. The up-converter of claim 15, wherein the in-phase harmonically rich signal is phase modulated as a function of the first information signal, and wherein the quadrature-phase harmonically rich signal is phase modulated as a function of the second information signal.

26. A up-converter, comprising:

a first combiner that generates a first combined signal from a first information signal and a second information signal;

a first impedance module coupled to the first combiner;

a second impedance module coupled to the first impedance module;

a first switch that gates the first combined signal as a function of an in-phase control signal, wherein the first switch is coupled to the first and second impedance modules and to a first reference potential, wherein the first combined signal is coupled to the first switch through the first impedance module, and wherein the second impedance module outputs an in-phase harmonically rich signal;

a second combiner that generates a second combined signal from a third information signal and a fourth information signal;

a third impedance module coupled to the second combiner;

a fourth impedance module coupled to the third impedance module; and

a second switch that gates the second combined signal as a function of a phase-shifted control signal, wherein the second switch is coupled to the third and fourth impedance modules and to a second reference potential, wherein the second combined signal is coupled to the second switch through the third impedance module, and wherein the fourth impedance module outputs a quadrature-phase harmonically rich signal.

27. The up-converter of claim 26, wherein the first impedance module includes a first inductor, and wherein the third impedance module includes a second inductor.

28. The up-converter of claim 26, wherein the second impedance module includes a first capacitor coupled in series with a first resistance, and wherein the fourth impedance module includes a second capacitor coupled in series with a second resistance.

29. The up-converter of claim 26, further comprising:

a first pulse shaping module coupled to the first switch that generates the in-phase control signal from an oscillating signal, wherein the in-phase control signal has a first frequency and a first phase; and

a second pulse shaping module coupled to the second switch that generates the phase-shifted control signal from a phase-shifted oscillating signal, wherein the phase-shifted control signal has a second frequency and a second phase.

30. The system of claim 29, further comprising:

an oscillator coupled to the first pulse shaping module that outputs the oscillating signal; and

a phase shifter coupled between the oscillator and the second pulse shaping module that outputs the phase-shifted oscillating signal.

31. The up-converter of claim 29, wherein the second frequency is substantially equal to the first frequency.

32. The up-converter of claim 29, wherein the second phase is substantially ninety degrees out of phase with the first phase.

33. The up-converter of claim 26, wherein the first switch opens and closes as a function of the in-phase control signal, and wherein the second switch opens and closes as a function of the phase-shifted control signal.

34. The up-converter of claim 26, further comprising a summer coupled to the second and fourth impedance modules, wherein the summer outputs an in-phase/quadrature-phase harmonically rich signal.

35. The up-converter of claim 34, further comprising a filter coupled to the summer, wherein the filter outputs at least one desired harmonic of a plurality of harmonics of the in-phase/quadrature-phase harmonically rich signal.

36. The up-converter of claim 26, wherein the in-phase harmonically rich signal is phase modulated as a function of the first information signal and amplitude modulated as a function of the second information signal.

37. The up-converter of claim 26, wherein the quadrature-phase harmonically rich signal is phase modulated as a function of the third information signal and amplitude modulated as a function of the fourth information signal.