System and method for measuring essential power amplification functions

• US 6,993,438 B2
• Filed: 03/24/2005
• Issued: 01/31/2006
• Est. Priority Date: 07/12/2002
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Agilent Technologies, Inc.
• Inventors: Upmaka, Murthy S., Jacobsen, Robert E.
• Primary Examiner(s): WACHSMAN, HAL D
• Application Number:
  US11/088,965
• Publication Number:
  US 20050171719A1
• Time in Patent Office: 313 Days
• Field of Search: 702 57- 59, 702/198, 702 64- 71, 702 73- 76, 702/106, 702/107, 702/85, 702/117, 702/118, 702/124, 702/126, 702/189, 702/194, 324/638, 324/637, 324/645, 324/646, 324/650, 324/642, 324533-535, 324/601, 324/612, 324/613, 324/605, 324/76.53, 324/763, 324/765, 324/615, 324/616, 324/619, 330/84, 330/124.R, 330/126
• US Class Current: 702/57
• CPC Class Codes: G01R 27/28 Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response in line transmission systems H04B3/46

Abstract

An apparatus includes a device under test, a network analyzer, an internal amplifier, a first switch, a second switch, a third switch, a first air-line directional coupler, and a first attenuator. A method of characterization measurement includes providing a harmonics signal from the device under test to a spectrum analyzer, providing a generated signal and a reflected signal to a first receiver disposed within a network analyzer, and recording a parameter deviation of the network analyzer.

Claims

1. A method for measuring power amplification functions, comprising a first mode that includes:

providing a first signal at a predetermined first frequency (F1) to an input of a device under test, wherein the first signal is provided by a measurement interface apparatus;

receiving a harmonics signal at the measurement interface apparatus from an output of the device under test;

passing the harmonics signal through an input port of a main-line of a first air-line directional coupler disposed within the measurement interface apparatus; and

providing the harmonics signal from an output port of the main-line of the first air-line directional coupler to a spectrum analyzer coupled to the measurement interface apparatus.

2. The method of claim 1, further comprising:

providing an initial signal at the predetermined first frequency to an input of a first amplifier, wherein the initial signal is generated by a signal generator coupled to the measurement interface apparatus;

receiving an amplified version of the initial signal from an output of the first amplifier, wherein the first signal provided to the input of the device under test is the amplified version of the initial signal.

3. The method of claim 2, wherein the first signal drives the device under test to full power output, further comprising a second mode that includes:

providing a second signal at a predetermined second frequency (F2) to an input of a second amplifier disposed within the measurement interface apparatus to provide an amplified second signal, wherein the second signal is generated by a network analyzer coupled to the measurement interface apparatus;

passing the amplified second signal through an input port of a directional coupler disposed within the measurement interface apparatus;

providing the amplified second signal from an output port of the directional coupler to a wide band isolator disposed within the measurement interface apparatus to provide an isolated second signal;

passing the isolated second signal through a coupled-line of the first airline directional coupler to the main-line of the first air-line directional coupler to provide a coupled second signal;

providing the coupled second signal to the output of the device under test, wherein the device under test reflects a portion of the coupled second signal as a reflected signal (S22);

passing the reflected signal through an input port of a main-line of a second air-line directional coupler to a coupled-line of the second air-line directional coupler disposed within the measurement interface apparatus to provide a coupled reflected signal; and

providing the coupled reflected signal to a first receiver disposed within a network analyzer coupled to the measurement interface apparatus.

4. The method of claim 3, further comprising:

providing the amplified second signal from a coupled output port of the directional coupler to produce a reference signal (R2); and

providing the reference signal to a second receiver disposed within the network analyzer.

5. The method of claim 1, further comprising a second mode that includes:

providing a second signal at a predetermined second frequency (F2) to an input of a second amplifier disposed within the measurement interface apparatus to provide an amplified second signal, wherein the second signal is generated by a network analyzer coupled to the measurement interface apparatus;

passing the amplified second signal through an input port of a directional coupler disposed within the measurement interface apparatus; and

providing the amplified second signal from an output port of the directional coupler to the input of the device under test, wherein the amplified second signal drives the device under test to full power output.

6. The method of claim 5, further comprising:

receiving a reflected signal (S 11) at the measurement interface apparatus from the input of the device under test; and

providing the reflected signal to a receiver disposed within the network analyzer.

7. The method of claim 5, further comprising a third mode that includes:

receiving a generated signal (S21) at the measurement interface apparatus from the output of the device under test;

passing the generated signal through an input port of a main-line of a second air-line directional coupler disposed within the measurement interface apparatus to produce a coupled generated signal; and

providing the coupled generated signal to a receiver disposed within the network analyzer.

8. The method of claim 7, further comprising:

providing the coupled generated signal from an output port of a coupled-line of the second air-line directional coupler to an attenuator to produce an attenuated generated signal, wherein the coupled generated signal provided to the receiver disposed within the network analyzer is attenuated.

9. The method of claim 5, further comprising:

providing the amplified second signal from a coupled output port of the directional coupler to produce a reference signal (R1); and

providing the reference signal (RI) to a receiver disposed within the network analyzer.

10. The method of claim 1, further comprising a fifth mode that includes:

blocking the first signal such that it does not enter the input of the device under test;

providing a second signal (FS 1) to the input of the device under test, wherein the second signal is generated by a network analyzer coupled to the measurement interface apparatus and the second signal is provided by the measurement interface apparatus;

receiving a reflected signal (s11) at the measurement interface apparatus from the input of the device under test; and

providing the reflected signal to a receiver disposed within the network analyzer.

11. The method of claim 1, further comprising a second mode that includes:

blocking the first signal such that it does not enter the input of the device under test;

providing a second signal (FS 1) to the input of the device under test, wherein the second signal is generated by a network analyzer coupled to the measurement interface apparatus and the second signal is provided by the measurement interface apparatus;

receiving a generated signal (s21) at the measurement interface apparatus from the output of the device under test; and

providing the generated signal to a receiver disposed within the network analyzer.

12. The method of claim 1, further comprising a second mode that includes:

blocking the first signal such that it does not enter the input of the device under test;

providing a second signal at a predetermined second frequency (F2) to an input of a amplifier disposed within the measurement interface apparatus to provide an amplified second signal, wherein the second signal is generated by a network analyzer coupled to the measurement interface apparatus;

providing the amplified second signal from an output port of a directional coupler to a wide band isolator disposed within the measurement interface apparatus to provide an isolated second signal;

passing the isolated second signal through a coupled-line of the first air-line directional coupler to the main-line of the first air-line directional coupler disposed within the measurement interface apparatus to provide a coupled second signal;

providing the coupled second signal to the output of the device under test, wherein the device under test reflects a portion of the coupled signal as a reflected signal (s22);

passing the reflected signal through an input port of a main-line of a second air-line directional coupler disposed within the measurement interface apparatus to a coupled-line of the second air-line directional coupler to provide a coupled reflected signal;

providing the coupled reflected signal to a receiver disposed within the network analyzer.

13. The method of claim 12, further comprising:

providing the amplified second signal from a coupled output port of the first air-line directional coupler to produce a reference signal (R2); and

providing the reference signal to a second receiver disposed within the network analyzer.