Control modules

• US 9,143,088 B2
• Filed: 12/15/2011
• Issued: 09/22/2015
• Est. Priority Date: 10/22/2004
• Status: Active Grant

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Sorrells, David F., Rawlins, Gregory S., Rawlins, Michael W.
• Primary Examiner(s): Le, Lana N
• Application Number:
  US13/327,371
• Publication Number:
  US 20120087445A1
• Time in Patent Office: 1,377 Days
• Field of Search: 455 91-129
• US Class Current: 1/1
• CPC Class Codes: H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal H03C7/00 takes precedence
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/0233 by using a signal derived from the output signal, e.g. bootstrapping the voltage supply
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 1/32 Modifications of amplifiers to reduce non-linear distortion by negative feedback H03F1/34
• CPC Class Codes: H03F 1/3205 in field-effect transistor amplifiers
• CPC Class Codes: H03F 1/3223 using feed-forward H03F1/3211 takes precedence
• CPC Class Codes: H03F 2200/336 A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
• CPC Class Codes: H03F 2200/387 A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 2201/3215 To increase the output power or efficiency
• CPC Class Codes: H03F 3/193 with field-effect devices H03F3/195 takes precedence
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H03F 3/45071 with semiconductor devices only
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/0483 : Transmitters with multiple parallel paths
• CPC Class Codes: H04B 2001/045 : with means for improving efficiency
• CPC Class Codes: H04B 2001/0491 : with frequency synthesizers, frequency converters or modulators
• CPC Class Codes: H04L 27/20 : Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/36 : Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/362 : Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence

Abstract

A circuit is provided comprising detector circuitry, calculating circuitry, and determining circuitry. The detector circuitry is figured to generate an I data signal magnitude value of a sampled I data signal and a Q data signal magnitude value of a sampled Q data signal. The calculating circuitry is configured to calculate a phase shift angle φ_I between first and second equal and constant or substantially equal and constant envelope constituents of the sampled I data signal and to calculate a phase shift angle φ_Q between first and second substantially equal and substantially constant envelope constituents of the sampled Q data signal. The determining circuitry is configured to determine in-phase and quadrature amplitude information of the substantially equal and substantially constant envelope constituents of the sampled I signal and to determine in-phase and quadrature amplitude information of the first and second substantially equal and substantially constant envelope constituents of the sampled Q signal.

Claims

1. A system comprising:

a magnitude detector configured to generate I and Q magnitude values of sampled I and Q envelope components of a baseband signal;

a vector modulator transfer function module configured to generate constant envelope constituents corresponding to each of the sampled I and Q envelope components;

a baseband magnitude generator configured to generate a magnitude of the baseband signal based on the I and Q magnitude values;

determining circuitry configured to determine a phase shift angle φ

between the constant envelope constituents corresponding corresponding to each of the sampled I and Q envelope components and to use the determined phase shift angle φ

to calculate in-phase and quadrature amplitude information; and

normalizing circuitry configured to normalize the I and Q magnitude values.

2. The system of claim 1, wherein the magnitude detector is, configured to perform a function as follows:

|Ī

|=mag(Ī

)

|Q|=mag(Q).

3. The system of claim 1, wherein the baseband magnitude generator is configured to perform a function as follows:

4. The system of claim 1, wherein the determining circuitry is configured to perform a function as follows:

5. The system of claim 1, wherein the normalizing circuitry is configured to perform a function as follows:

|I|<sub>clk—

phase</sub>=ƒ

(|Ī

|)

|Q|<sub>clk—

phase</sub>=ƒ

(| Q|).

wherein Iclk_phase represents an in-phase component of a clock signal and wherein Qclk_phase represents a quadrature component of the clock signal.

6. The system of claim 1, wherein the determining circuitry and the normalizing circuitry are configured to output, respectively, |Iclk_phase| and |Qclk_phase| magnitude information and the calculated in-phase and quadrature amplitude information to a digital-to-analog converter, wherein Iclk_phase represents an in-phase component of a clock signal and wherein Qclk_phase represents a quadrature component of the clock signal.

7. A method of detecting magnitude, the method comprising:

generating an I magnitude value from a sampled I envelope component of a baseband signal;

generating a Q magnitude value from a sampled Q envelope component of the baseband signal;

generating a magnitude of the baseband signal based on the I and Q magnitude values;

generating constant envelope constituents corresponding to each of the sampled I and Q envelope, components;

calculating a phase shift angle φ

between the constant envelope constituents corresponding to each of the sampled I and Q envelope components;

determining information regarding an in-phase amplitude and a quadrature amplitude using the calculated phase shift angle φ

; and

normalizing the I and Q magnitude values.

8. The method of claim 7, wherein the I and Q magnitude values are generated as follows:

|Ī

|=mag(Ī

)

| Q|=mag(Q).

9. The method of claim 7, wherein the magnitude of the baseband signal is generated according to the following equations:

10. The method of claim 7, wherein the phase shift angle is determined according to the following equation:

φ

=ƒ

(| R|)

wherein R is the magnitude of the baseband signal.

11. The method of claim 7, wherein the in-phase and quadrature amplitude information is determined according to the following equations:

12. The method of claim 7, wherein I and Q magnitude values are normalized according to the following equations:

|I|<sub>clk—

phase</sub>=ƒ

(|Ī

|)

|Q|<sub>clk—

phase</sub>=ƒ

(| Q|)

wherein Iclk_phase represents an in-phase component of a clock signal and wherein Qclk_phase represents a quadrature component of the clock signal.