Switched coupler type digital phase shifter using quadrature generator

• US 6,985,049 B2
• Filed: 11/18/2003
• Issued: 01/10/2006
• Est. Priority Date: 11/18/2002
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Hyoung, Chang Hee, Kang, Sung Weon, Kim, Yun Tae
• Primary Examiner(s): Ham, Seungsook
• Application Number:
  US10/716,571
• Publication Number:
  US 20040100315A1
• Time in Patent Office: 784 Days
• Field of Search: 333/101, 333/103, 333138-140, 333/156, 333/161, 333/164
• US Class Current: 333/156
• CPC Class Codes: H01P 1/185 using a diode or a gas filled discharge tube
• CPC Class Codes: H03H 11/22 providing two or more phase shifted output signals, e.g. n-phase output

Abstract

A switched coupler type digital phase shifter using a quadrature generator is disclosed. A switched coupler type digital phase shifter includes: a coupling unit for receiving one input signal and generating a first signal and a second signal having 180 degree phase difference based on the received input signal; a quadrature signal generation unit for generating a third signal to a sixth signal having 90 degree phase difference to each other based on the first signal and the second signal outputted from the coupling unit; and a switching unit for selectively outputting one of the third signal to the sixth signal outputted from the quadrate signal generation unit in response to a control signal. The present invention can increased integration of the multi-bit digital phase shifter by implementing multi bit phase variant with only one phase shifter. Also, the insertion loss can be minimized.

Claims

1. A switched coupler type digital phase shifter, comprising:

a coupling means for receiving one input signal and generating a first signal and a second signal having 180 degree phase difference based on the received input signal;

a quadrature signal generation means for generating a third signal to a sixth signal having 90 degree phase difference to each other based on the first signal and the second signal outputted from the coupling means; and

a switching means for selectively outputting one of the third signal to the sixth signal outputted from the quadrature signal generation means in response to a control signal.

2. The switched coupler type digital phase shifter as recited in claim 1, wherein the coupling means includes an active balanced-to-unbalanced (balun).

3. The switched coupler type digital phase shifter as recited in claim 1, wherein the coupling means includes a passive balanced-to-unbalanced (balun).

4. The switched coupler type digital phase shifter as recited in claim 1, wherein the switching means includes a SP4T switch implemented by using a circuit of transistor and diode or a micro electron mechanical (MEM) device.

5. The switched coupler type digital phase shifter as recited in claim 1, wherein the quadrature signal generation means includes a poly-phase filter.

6. A multi-bit digital phase shifter, comprising:

a controller for generating control signals;

a digital phase shifter for receiving an input signal and the control signals from the controller and generating a first phase shifted signal having 45 degree phase difference comparing to the input signal base on the control signals; and

a switched coupler type digital phase shifter for receiving the first phase shifted signals from a digital phase shifter and the control signal from the controller and generating a second phase shifted signal having 90 degree phase difference comparing to the first phase shifted signal,

wherein the switched coupler type digital phase shifter includes;

a coupling means for receiving the first phase shifted signal and generating a first signal and a second signal having 180 degree phase difference based on the received input signal;

a quadrature signal generation means for generating a third signal to a sixth signal having 90 degree phase difference to each other based on the first signal and the second signal outputted from the coupling means; and

a switching means for selectively outputting one of the third signal to the sixth signal outputted from the quadrature signal generation means as the second phase shifted signal in response to a control signals.

7. A multi-bit digital phase shifter, comprising:

a controller for generating a control signals;

a switched coupler type digital phase shifter for receiving an input signal and the control signal from the controller and generating a first phase shifted signal based on the control signals,

wherein the switched coupler type digital phase shifter includes;

a coupling means for receiving the input signal and generating a first signal and a second signal having 180 degree phase difference based on the received input signal;

a quadrature signal generation means for generating a third signal to a sixth signal having 90 degree phase difference to each other based on the first signal and the second signal outputted from the coupling means; and

a switching means for selectively outputting one of the third signal to the sixth signal outputted from the quadrature signal generation means as the first phase shifted signal in response to a control signals; and

a digital phase shifter for receiving the first phase shifted signal from the switched coupler type digital phase shifter and the control signals from the controller and generating a second phase shifted signal having 45 degree phase difference comparing to the first phase shifted signal base on the control signals.