SYSTEM FOR CHARACTERIZING MIXER OR CONVERTER RESPONSE

• US 20120295548A1
• Filed: 05/18/2011
• Published: 11/22/2012
• Est. Priority Date: 05/18/2011
• Status: Active Grant

• Current Assignee: Keysight Technologies, Inc.
• Original Assignee: Agilent Technologies, Inc.
• Inventors: DUNSMORE, Joel P.
• Granted Patent: US 8,744,370 B2
• Time in Patent Office: Days
• US Class Current: 455/67.16
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements

Abstract

A network analyzer comprises: a signal source configured to supply an input signal to a device, wherein the device is configured to generate a phase reference signal; a receiver configured to receive the phase reference signal from the device and to measure a phase response of the device according to the phase reference signal; and a calibration component configured to compare the measured phase response of the device with an actual phase response of the device to identify a tracking parameter for the receiver.

Claims

1. A method of calibrating a network analysis system comprising a device measurement path located between a first receiver and a second receiver, the method comprising:

determining a phase response of the first receiver independent of the second receiver;

determining a phase response of the second receiver; and

determining a phase tracking response from the phase response of the first receiver and the phase response of the second receiver to establish a calibration of the device measurement path.

2. The method of claim 1, wherein the phase response of the second receiver is determined independent of the first receiver.

3. The method of claim 1, further comprising:

determining scattering parameters (S-parameters) for the device measurement path;

determining a tracking parameter of the device measurement path from the S-parameters,

wherein the phase response of the second receiver is determined from the tracking parameter and the phase response of the first receiver.

4. The method of claim 1, wherein determining the phase response of the first receiver comprises:

measuring a raw phase response of a device using the first receiver; and

modifying the raw phase response according to an actual phase response of the device.

5. The method of claim 4, wherein modifying the raw phase response comprises dividing the raw phase response by the actual phase response of the device.

6. The method of claim 4, further comprising applying a smoothing function to the actual phase response prior to modifying the raw phase response.

7. The method of claim 4, wherein the device comprises a comb generator.

8. The method of claim 4, wherein interpolation is used to generate a phase response between measurement points of the measured raw phase response.

9. The method of claim 1, further comprising measuring a phase response of a frequency translation device through the device measurement path, and correcting the measured phase response of the frequency translation device according to a phase tracking parameter of the first receiver and a phase tracking parameter of the second receiver.

10. The method of claim 9, wherein the frequency translation device is a multi-stage frequency converter.

13. The method of claim 10, wherein the signal processing system comprises a vector network analyzer.

11. A method of characterizing a phase response of a receiver in a signal processing system, the method comprising:

measuring a phase response of a device using the receiver; and

modifying the measured phase response according to an actual phase response of the device to generate a phase tracking parameter of the receiver.

12. The method of claim 11, wherein interpolation is used to generate a phase response between measurement points of the measured phase response.

14. A network analyzer, comprising:

a signal source configured to supply an input signal to a device, wherein the device is configured to generate a phase reference signal;

a receiver configured to receive the phase reference signal from the device and to measure a phase response of the device according to the phase reference signal; and

a calibration component configured to compare the measured phase response of the device with an actual phase response of the device to identify a tracking parameter for the receiver.

15. The network analyzer of claim 14, wherein the device comprises a harmonic comb generator having a known phase response.

16. The network analyzer of claim 14, wherein the calibration component compares the measured phase response to the actual phase response by performing a division operation to generate the tracking parameter for the receiver.

17. The network analyzer of claim 14, further comprising a second receiver located on an opposite side of a device measurement path from the receiver, wherein the calibration component is further configured to identify a tracking parameter of the second receiver based on the tracking parameter of the receiver.

18. The network analyzer of claim 17, further comprising a device measurement component configured to determine a phase response of a frequency translating device using the tracking parameters of the receiver and the second receiver.

19. The network analyzer of claim 14, wherein interpolation is used to generate a phase response between measurement points of the measured phase response.

20. The network analyzer of claim 17, wherein the calibration component determines the tracking parameter of the second receiver by dividing the tracking parameter of the receiver by a tracking parameter of the device measurement path.