Integrated radio-frequency receiver

• US 20030228860A1
• Filed: 06/06/2002
• Published: 12/11/2003
• Est. Priority Date: 06/06/2002
• Status: Abandoned Application

• Current Assignee: United Radiotek Inc.
• Original Assignee: United Radiotek Inc.
• Inventors: Jou, Chewnpu
• Application Number:
  US10/064,063
• Publication Number:
  US 20030228860A1
• Time in Patent Office: Days
• US Class Current: 455/324
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22

Abstract

An integrated radio frequency receiver, having a local oscillator, a mixer apparatus, a phase-shift apparatus, and an analog-to-digital conversion apparatus. The local oscillator is used to generate a local oscillation signal. The mixer mixes, filters and amplifies a radio-frequency carrier input signal and the local oscillation signal to output the first amplified and second amplified signals. The phases of the first and second amplified signals are shifted with first and second degrees as first and second output phase-shifted signals, respectively. The analog-to-digital conversion apparatus then performs analog-to-digital conversion on the first amplified and the second phase-shifted signal, and the second amplified and first phase-shifted signal to output an in-phase signal and an orthogonal-phase signal, respectively.

Claims

1. An integrated radio-frequency receiver, comprising:

a local oscillator, to generate a local oscillation signal;

a mixer apparatus, coupled to the local oscillator to receive a radio-frequency carrier input signal and the local oscillation signal, and to mix, filter and amplify the radio-frequency carrier input signal and the local oscillation signal to output a first amplified signal and a second amplified signal;

a phase-shift apparatus, coupled to the mixer apparatus to shift phases of the first and second amplified signals with a first degree and a second degree, and to output a first phase-shifted signal and a second phase-shifted signal; and

an analog-to-digital conversion apparatus, coupled to the mixer apparatus and the phase-shift apparatus to receive the first amplified signal and the second phase-shifted signal, and the second amplified signal and the first phase-shifted signal, so as to output an in-phase signal and an orthogonal-phase signal by performing analog-to-digital conversion thereon, respectively.

2. The integrated radio-frequency receiver according to claim 1, wherein the phase-shift apparatus comprises:

a first phase shifter, coupled to the mixer apparatus and the analog-to-digital conversion apparatus to receive the first amplified signal, and to shift the first amplified signal with the first degree to output the first phase-shifted signal; and

a second phase shifter, coupled to the mixer apparatus and the analog-to-digital conversion apparatus to receive the second amplified signal, and to shift the second amplified signal with the second degree to output the second phase-shifted signal.

3. The integrated radio-frequency receiver according to claim 2, wherein the first degree is 90°

.

4. The integrated radio-frequency receiver according to claim 2, wherein the second degree is 90°

.

5. The integrated radio-frequency receiver according to claim 2, wherein the first phase shifter is operative to reduce an intermediate frequency.

6. The integrated radio-frequency receiver according to claim 2, wherein the second phase shifter is operative to reduce an intermediate frequency.

7. The integrated radio-frequency receiver according to claim 2, wherein the first phase shifter is implemented by a switching capacitor circuit.

8. The integrated radio-frequency receiver according to claim 2, wherein the second phase shifter is implemented by a switching capacitor circuit.

9. The integrated radio-frequency receiver according to claim 1, wherein the mixer apparatus comprises:

a 90°

phase shifter, coupled to the local oscillator to receive the local oscillation signal and to shift the local oscillation signal by 90°

, and to output a 90°

shifted local oscillation signal;

a first mixer, coupled to the local oscillator to receive and mix the radio-frequency carrier input signal and the local oscillation signal, so as to output a first intermediate-frequency signal;

a second mixer, coupled to the 90°

phase shifter to receive and mix the local radio-frequency carrier input signal and the 90°

shifted local oscillation signal, so as to output a second intermediate-frequency signal;

a first filter, coupled to the first mixer to receive the first intermediate-frequency signal and to filter the first intermediate-frequency signal to output a first base-band signal;

a second filter, coupled to the second mixer to receive the second intermediate-frequency signal and to filter the second intermediate-frequency signal to output a second base-band signal;

a first amplifier, coupled to the first filter to receive and amplify the first base-band signal and output a first amplified signal; and

a second amplifier, coupled to the second filter to receive and amplify the second base-band signal and output a second amplified signal.

10. The integrated radio-frequency receiver according to claim 9, wherein the first filter includes a low-pass filter.

11. The integrated radio-frequency receiver according to claim 9, wherein the second filter includes a low-pass filter.

12. The integrated radio-frequency receiver according to claim 1, wherein the analog-to-digital conversion apparatus comprises:

a first sample maintaining apparatus, coupled to the mixer apparatus and the phase-shift apparatus to receive the first amplified signal and the second phase-shifted signal, and to perform arithmetic operation and sample maintaining thereon to output a first sample maintaining signal;

a second sample maintaining apparatus, coupled to the mixer apparatus and the phase-shift apparatus to receive the second amplified signal and the first phase-shifted signal, and to perform arithmetic operation and sample maintaining thereon to output a second sample maintaining signal;

a first analog-to-digital converter, coupled to the first sample maintaining apparatus to receive the first sample maintaining signal, and to perform analog-to-digital conversion thereon to output the in-phase signal; and

a second analog-to-digital converter, coupled to the second sample maintaining apparatus to receive the second sample maintaining signal, and to perform analog-to-digital conversion thereon to output the orthogonal-phase signal.

13. The integrated radio-frequency receiver according to claim 1, including a single-side-band receiver.

14. An integrated radio-frequency receiver, comprising:

a local oscillator, to generate a local oscillation signal;

a 90°

phase shifter, coupled to the local oscillator to receive the local oscillation signal and to shift the phase of the local oscillation signal by 90°

into a 90°

shifted local oscillation signal to be output;

a first mixer, coupled to the local oscillator to receive and mix a radio-frequency carrier input signal and the local oscillation signal to output a first intermediate-frequency signal;

a second mixer, coupled to the 90°

phase shifter to receive and mix the radio-frequency carrier input signal and the 90°

shifted local oscillation signal to output a second intermediate-frequency signal;

a first filter, coupled to the first mixer to receive and filter the first intermediate-frequency signal to output a first base-band signal;

a second filter, coupled to the second mixer to receive and filter the second intermediate-frequency signal to output a second base-band signal;

a first amplifier, coupled to the first filter to receive and amplify the first base-band signal and output a first amplified signal;

a second amplifier, coupled to the second filter to receive and amplify the second base-band signal and output a second amplified signal;

a first phase shifter, coupled to the first amplifier to receive and shift the phase of the first amplified signal with a first degree, so as to output a first phase-shifted signal;

a second phase shifter, coupled to the second amplifier to receive and shift the phase of the second amplified signal with a second degree, so as to output a second phase-shifted signal;

a first sample maintaining apparatus, coupled to the first amplifier apparatus and the second phase shifter to receive the first amplified signal and the second phase-shifted signal, and to perform arithmetic operation and sample maintaining thereon to output a first sample maintaining signal;

a second sample maintaining apparatus, coupled to the second amplifier and the first phase shifter to receive the second amplified signal and the first phase-shifted signal, and to perform arithmetic operation and sample maintaining thereon to output a second sample maintaining signal;

a first analog-to-digital converter, coupled to the first sample maintaining apparatus to receive the first sample maintaining signal, and to perform analog-to-digital conversion thereon to output the in-phase signal; and

a second analog-to-digital converter, coupled to the second sample maintaining apparatus to receive the second sample maintaining signal, and to perform analog-to-digital conversion thereon to output the orthogonal-phase signal.

15. The integrated radio-frequency receiver according to claim 14, wherein the first degree is 90°

.

16. The integrated radio-frequency receiver according to claim 14, wherein the second degree is 90°

.

17. The integrated radio-frequency receiver according to claim 14, wherein the first phase shifter is operative to reduce the frequency of an intermediate frequency.

18. The integrated radio-frequency receiver according to claim 14, wherein the second phase shifter is operative to reduce the frequency of an intermediate frequency.

19. The integrated radio-frequency receiver according to claim 14, wherein the first phase shifter is implemented by a switching capacitor circuit.

20. The integrated radio-frequency receiver according to claim 14, wherein the second phase shifter is implemented by a switching capacitor circuit.

21. The integrated radio-frequency receiver according to claim 14, wherein the first filter includes a low-pass filter.

22. The integrated radio-frequency receiver according to claim 14, wherein the second filter includes a low-pass filter.

23. The integrated radio-frequency receiver according to claim 14, including a single-side-band receiver.