Ultra-broadband programmable hybrid step attenuator

Patent metadata

Field	Value
Publication number	US-9479200-B2
Application number	US-201414192732-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Feb 27, 2014
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

Systems and methods for partitioning the frequency spectrum for use in a plurality of function circuits, including step attenuation, phase modulation, and gain amplification functional circuits. A system may include a programmable step attenuator including selection circuitry and functional circuitry. First selection circuitry may include a plurality of outputs and may receive a signal and selectively provide the signal to an output based on the signal's frequency. First circuitry may be coupled to one of the outputs and may operate as a first step attenuator for signals in a first portion of the frequency spectrum. Second circuitry may be coupled to another output and operate as a second step attenuator for signals in a second portion of the frequency spectrum. Second selection circuitry may be coupled to the first and second circuitry and may provide a step attenuated signal from the first or second portion of the frequency spectrum.

First claim

We claim:

1. A programmable step attenuator, comprising:
a first diplexer, wherein the first diplexer comprises an input, a first output and a second output, wherein the first diplexer is configured to:
receive a signal at the input;
selectively provide the signal to the first output if the signal is in a first portion of the frequency spectrum; and
selectively provide the signal to the second output if the signal is in a second portion of the frequency spectrum;

a plurality of pin-diode switches coupled to the first output of the first diplexer, wherein the plurality of pin-diode switches operate as a first step attenuator for the signal if the signal is in the first portion of the frequency spectrum;
a plurality of radio frequency (RF) micro-electro-mechanical system (MEMS) switches, coupled to the second output of the first diplexer, wherein the plurality of RF MEMS switches operate as a second step attenuator for the signal if the signal is in the second portion of the frequency spectrum; and
a second diplexer comprising a first input, a second input, and an output, wherein the first input is coupled to the first step attenuator, and wherein the second input is coupled to the second step attenuator, wherein the second diplexer is configured to output a step attenuated signal from either the first or second portion of the frequency spectrum.

2. The programmable step attenuator of claim 1 , further comprising:
a relay coupled between the second output of the first diplexer and the plurality of RF MEMS switches, wherein the relay is configured to protect the plurality of RF MEMS switches.

3. The programmable step attenuator of claim 1 , further comprising:
an electrostatic discharge (ESD) protection device coupled between the second output of the first diplexer and the plurality of RF MEMS switches, wherein the ESD protection device is configured to protect the programmable step attenuator.

4. The programmable step attenuator of claim 1 ,
wherein the plurality of pin-diode switches operate as the first step attenuator for the signal if the signal is in a high portion of the frequency spectrum;
wherein the plurality of RF MEMS switches operate as the second step attenuator for the signal if the signal is in a low portion of the frequency spectrum.

5. The programmable step attenuator of claim 1 ,
wherein the first portion of the frequency spectrum comprises frequencies above 60 Megahertz, wherein the second portion comprises frequencies below 60 Megahertz.

6. The programmable step attenuator of claim 1 ,
wherein the first and second step attenuators are programmable to provide a first level of attenuation.

7. A method for attenuating a signal, comprising:
receiving a signal at an input;
selectively providing the signal to a first output if the signal is in a first portion of the frequency spectrum, or to a second output if the signal is in a second portion of the frequency spectrum;
performing first step attenuation of the signal if the signal is in the first portion of the frequency spectrum, wherein said performing first step attenuation comprises receiving the signal from the first output;
performing second step attenuation of the signal if the signal is in the second portion of the frequency spectrum, wherein said performing second step attenuation comprises receiving the signal from the second output;
providing either a first step attenuated signal or a second step attenuated signal as an output.

8. The method of claim 7 , wherein said selectively providing the signal comprises:
selectively providing, by a diplexer, the signal to the first output if the signal is in the first portion of the frequency spectrum; and
selectively providing, by the diplexer, the signal to the second output if the signal is in the second portion of the frequency spectrum.

9. The method of claim 7 , wherein said performing first step attenuation further comprises:
performing the first step attenuation using a plurality of pin-diode switches.

10. The method of claim 7 , wherein said performing second step attenuation further comprises:
performing the second step attenuation using a plurality of radio frequency (RF) micro-electro-mechanical system (MEMS) switches.

11. The method of claim 10 , wherein said performing second step attenuation further comprises:
protecting, by a relay, the plurality of RF MEMS switches.

12. The method of claim 7 , wherein said performing second step attenuation further comprises:
absorbing, by an electrostatic discharge (ESD) protection device, electrostatic discharge.

13. The method of claim 7 , wherein said providing step attenuated signals comprises:
receiving, by a diplexer, the first step attenuated signal at a first input of the diplexer or the second step attenuated signal at a second input of the diplexer; and
providing, by a diplexer, either the first step attenuated signal or the second step attenuated signal at an output of the diplexer.

14. The method of claim 7 ,
wherein said performing the first step attenuation attenuates the signal if the signal is in a high portion of the frequency spectrum;
wherein said performing the second step attenuation attenuates the signal if the signal is in a low portion of the frequency spectrum.

15. A programmable step attenuator, comprising:
first selection circuitry configured to:
receive a signal at an input;
selectively provide the signal to a first output of a plurality of outputs if the signal is in a first portion of a plurality of portions of the frequency spectrum; and
selectively provide the signal to a second output of a plurality of outputs if the signal is in a second portion of the plurality of portions of the frequency spectrum;

first circuitry coupled to the first output of the first selection circuitry, wherein the first circuitry operates as a first step attenuator for the signal if the signal is in the first portion of the frequency spectrum;
second circuitry coupled to the second output of the first selection circuitry, wherein the second circuitry operates as a second step attenuator for the signal if the signal is in the second portion of the frequency spectrum; and
second selection circuitry coupled to the first circuitry and the second circuitry, wherein the second selection circuitry is configured to provide either a step attenuated signal from the first portion of the frequency spectrum or a step attenuated signal from the second portion of the frequency spectrum.

16. The programmable step attenuator of claim 15 , wherein the first circuitry comprises:
a plurality of pin-diode switches, wherein the plurality of pin-diode switches operate as the first step attenuator for the signal if the signal is in the first portion of the frequency spectrum.

17. The programmable step attenuator of claim 15 , wherein the second circuitry comprises:
a plurality of radio frequency (RF) micro-electro-mechanical system (MEMS) switches, wherein the plurality of RF MEMS switches operate as the second step attenuator for the signal if the signal is in the second portion of the frequency spectrum.

18. The programmable step attenuator of claim 17 , wherein the second circuitry further comprises:
a relay, wherein the relay is configured to protect the plurality of RF MEMS switches.

19. The programmable step attenuator of claim 15 , wherein the second circuitry further comprises:
an electrostatic discharge (ESD) protection device, wherein the ESD protection device is configured to protect the first and second circuitr

Assignees

• Nat Instr Corp

Inventors

• Karbassi Abdolreza
• Moran Tamir E

Classifications

• H03H7/24 Primary

  Frequency- independent attenuators · CPC title

• H04B1/0057 Primary

  using diplexing or multiplexing filters for selecting the desired band · CPC title

• H03H2007/006

  MEMS · CPC title